Volumn Content

Journal of Southwest Petroleum University(Science & Technology Edition) 2010 Vol.32 Please wait a minute... For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails Select OIL AND GAS LEAKAGE SYSTEM AND THE PROSPECTS FOR OIL AND GAS EXPLORATION，YINGGEHAI BASIN HE Jia-xiong;ZHU You-hai;WENG Rong-nan;CHEN Sheng-hong;GONG Xiao-feng 西南石油大学学报(自然科学版)    2010, 32 (1): 1-10.   DOI: 10.3863/j.issn.1674-5086.2010.01.001 Abstract （1321）      PDF（pc） （1227KB）（653）       Knowledge map    Save Oil and gas leakage system develops in Yinggehai Basin，northwestern South China Sea，which is composed of the mixed type of gas chimney，sea bed dot/pit like “micro leakage”，and oil/gas seepage “marcro leakage”，the oil/gas mixed system oil/gas seepage and gas chimney on eastern Yinggehai slope is more remarkable，and the gas chimney at mud diapir belt in the central depression of the central basin and dot/pit like “micro seepage” system on the sea bed are quite common.In the area，hydrocarbon source is abundant and up to now，it is still in the process of dynamic reservoir formation of generation，accumulation，gathering and dispersion，there is good condition of hydrocarbon generation，migration，accumulation and reservoir formation.It is recognized that key breakthrough for hydrocarbon exploration is to enhance the comprehensive analysis and research on oil/gas seepage system and migration，accumulation and reservoir formation.The proposal is suggested that the theory of dynamic balancing reservoir formation of oil/gas migration and accumulation should be used to predict and evaluate favorable hydrocarbonrich area and optimize the explorative tar.gets with good trap and preservation. Related Articles | Metrics Select THE SUITABILITY ANALYSIS OF LOG DISTINGUISHING METHODS OF FLUID NATURE OF FRACTURE AND CAVE RESERVOIR IN PUGUANG FIELD SIMA Li-qiang;ZHAO Ran;WANG Pei-chun;TAN Yong 西南石油大学学报(自然科学版)    2010, 32 (1): 11-15.   DOI: 10.3863/j.issn.1674-5086.2010.01.002 Abstract （800）      PDF（pc） （837KB）（615）       Knowledge map    Save The well logging identification of reservoir fluid property is the key to determine hydrocarbon reservoir in time.Reservoir rocks，physical property and pore texture of Feixianguan Formation，Puguang gas field in northeastern Sichuan，are very complicated，the reservoir is the one with developed fracture and vug accumulative spaces and severe heterogeneity and anisotropy，well logging response is with multiple resolution，which makes identifying reservoir fluid property with logging data even more difficult.Started from conventional logging data analysis，five kinds of fluid property identification methods are optimally figured out，on the basis of analyzing the principles and methods，all kinds of suitable methods which can be used in fracture and cave reservoir in Puguang gas field are probed，a set of simple and reasonable identification method association suitable for the types of reservoirs are presented. Related Articles | Metrics Select MICROSCOPIC EXPERIMENT ON OIL FLOWING THROUGH POROUS MEDIA IN LOW PERMEABILITY SANDSTONE ZHU Zhi－qiang;ZENG Jian－hui;WANG Jian－jun 西南石油大学学报(自然科学版)    2010, 32 (1): 16-20.   DOI: 10.3863/j.issn.1674-5086.2010.01.003 Abstract （887）      PDF（pc） （651KB）（578）       Knowledge map    Save By using natural sandstone microscopic model and the waterdriveoil experiment under the condition of similarly real geologic situation，the crude oil flowing through porous media in low permeability sandstone is simulated.The flow course and characteristics of crude oil in pores and throats are observed.The micromechanism of oil flowing through porous media in low permeability sandstone is analyzed and discussed.The result shows that the flow pathway is complicated and the flow patterns appear three types，they are stable，fingering and preferable ones.The relationship between threshold pressure gradient and sandstone porosity is complicated when oil flows in low permeability sandstone，but there is a good relationship between the gradient and the permeability，and also，there is a good relationship between crude oil flowing velocity and displacing pressure，when flowing in different permeability sandstones at same velocity，oil displacing pressure will decrease as the permeability increases. Related Articles | Metrics Select ANALYSIS ON CHARACTERISTICS OF DEEPWATER SEDIMENTARY TIGHT SANDSTONE RESERVOIR OF CHANG 6 IN HUAQING AREA LIU Hao-wei;ZHENG Xing-yuan;CHEN Quan-hong;GUO Yan-qin;LIU Chun-yan 西南石油大学学报(自然科学版)    2010, 32 (1): 21-26.   DOI: 10.3863/j.issn.1674-5086.2010.01.004 Abstract （743）      PDF（pc） （1710KB）（692）       Knowledge map    Save The sedimentary characteristics，lithology characteristics，porositypermeability characteristics，diagenesis types，pore texture and pore types of the reservoir of the Change 6 formation in Huaqing area are studied through analyzing the core，thin sections，casting thin sections and physical property.The result indicates that the deepwater sedimentary sandstone reservoir of Chang 6 formation has the following characters  ultrafined grain size of the deposits，low comparative maturity and moderated textural maturity，the pore types include residual interparticle pores，and secondary dissolution pore.The pore structure is mainly composed by the micropore finethroat type.Between porosity and permeability of the investigated area，there are good positive correlations.It is a typical reservoir from low pore，low osmosis to extra low pore，extra low osmosis. Related Articles | Metrics Select A NEW WATER SATURATION MODEL FOR NONNET PAY IN LOW CLOSURE RESERVOIR WANG Min;SUN Jian-meng;LAI Fu-qiang;YU Hua-wei 西南石油大学学报(自然科学版)    2010, 32 (1): 27-32.   DOI: 10.3863/j.issn.1674-5086.2010.01.005 Abstract （747）      PDF（pc） （410KB）（592）       Knowledge map    Save There is great deal of oil and water existing in the same bed because of lower closure and poorer oil and water separation in P pay zone，G area，and there are similar physical and electrical properties between the bed containing both water and oil and the pay zone，the common method calculating water saturation by resistivity and porosity is ineffective，and also，in the process of development in the area，multibed testing is applied，the beds that liquid production is both oil and water are fewer，the samples that can be used to set up the model for the saturation o oil and water existing in the same bed are fewer，too，which makes correct calculation of the saturation of oil and water existing in the same bed more difficult in present resource amount.In this paper，it is presented that some pressure tight coring wells are taken as examples，the relationship between water productivity and water saturation is established by using phase permeability data，then the result is popularized to conventional coring wells to obtain supplement samples of water saturation，furthermore，by means of such modeling parameters as optimal porosity and resistivity ratio etc.，the new model calculating the saturation of oil and water existing in the same bed and being suitable for the area is set up，the mean relative error is 3.59%，which meets the need of the precision of resource calculation. Related Articles | Metrics Select THE INFLUENCE OF ADJUSTMENT AND MODIFICATION ON HYDROCARBON ACCUMULATION IN TAZHONG AREA PANG Hong;PANG Xiong-qi;SHI Xiu-ping;XIANG Cai-fu; 西南石油大学学报(自然科学版)    2010, 32 (1): 33-39.   DOI: 10.3863/j.issn.1674-5086.2010.01.006 Abstract （855）      PDF（pc） （1568KB）（580）       Knowledge map    Save In the complicated superimposed basin in western China，the adjustment and modification after the formation of oil and gas reservoirs are very common，through the analysis of the adjustment and modification happening in central Tarim Basin，it is recognized that the area underwent 3 to 4 times adjustment and modification，they were in Ordovician and Silurian，which was destructive，IndoYanshan period and Himalaya period，which were constructive.In central Tarim area，the forms of the adjustment and modification are local activity of faults and local migration of traps.There are following three aspects of the influence of adjustment and modification on the oil and gas reservoirs in central Tarim，firstly，the coexistence of multiple phasebehavior oil and gas，secondly，reallocation of hydrocarbon resource and thirdly，the formation of the present distribution of oil and gas.Most of the discovered reservoirs in Central Tarim are the secondary ones adjusted from underlaid formations，in No.10 belt and slope break on No.1 belt in central Tarim，the underlaid Ordovician and Cambrian are of bright explorative potential. Related Articles | Metrics Select STUDY ON THE APPLICATION OF ITERATIVE INVERSION OF SURFACE WAVE BASED ON ARTIFICIAL NEURAL NETWORK HE Yi;ZHANG Jin;LIU Huai-shan 西南石油大学学报(自然科学版)    2010, 32 (1): 40-44.   DOI: 10.3863/j.issn.1674-5086.2010.01.007 Abstract （783）      PDF（pc） （810KB）（630）       Knowledge map    Save Because traditional methods applied in investigating surfacestructure are restricted on paralic zone，according to the feature of surfacestructure on paralic zone，the try is done to use the surface wave on seismic record to research the surfacestructure and to offer deep exploration activity of weathering zone.In view of shortages in the methods applied in dispersion curve inversion of surface wave，an iterative inversion method based on BP(Backpropagation) artificial neural network is introduced to surface wave and it is used to predict the parameters of eathering zone on paralic zone.Combined with very strong selflearning，selfadapting，selforganizing and faulttolerant ability of neural network，the prediction power of conventional iterative inversion method is enhanced effectively.By testing the model of paralic surfacestructure，the good effect can be obtained.Moreover，applied to real data，the method still gives out satisfactory result. Related Articles | Metrics Select MAIN CONTROL FACTORS OF CARBONIFEROUS COMPOSITE TRAP DEVELOPMENT IN EASTERN SICHUAN LIU Yong;SHAO Yong;ZHANG Fan;WANG Xing-zhi;LUO Chuan-you 西南石油大学学报(自然科学版)    2010, 32 (1): 45-51.   DOI: 10.3863/j.issn.1674-5086.2010.01.008 Abstract （855）      PDF（pc） （1098KB）（592）       Knowledge map    Save The composite traps developed in eastern Sichuan Carboniferous are mainly stratumstructure ones with variety of traps and fully filled，they are the one of many further explorative targets.There are poretyped and fracturetyped gas reservoirs and the latter is dominant，in general，the pore diameter is small and the porethroat system is poor in sorting，microfractures are well developed，connection is good，most of the system are characterized by midpore and small throat.Carboniferous reservoirs are mainly developed in Member II and III of Huang Formation.The regions in strong erosion and adjacent Carboniferous erosive margin are the lacking ones of natural gas reservoirs，nearby，there is the possibility of forming composite gas traps.Sedimentary facies controls in reservoir rocks，diagenesis determines accumulation and permeability of the reservoirs，the ancient karsting and tectonic activity developed on ancient uplift further controlled and improved permeability of the reservoirs. Related Articles | Metrics Select STUDY ON GEOPHYSICAL TECHNOLOGY TO PREDICT DEEP TURBIDITE SANDSTONE AND CONGLOMERATE BODIES DONG Li-sheng; 西南石油大学学报(自然科学版)    2010, 32 (1): 52-56.   DOI: 10.3863/j.issn.1674-5086.2010.01.009 Abstract （721）      PDF（pc） （1351KB）（649）       Knowledge map    Save Many factors result in low degree of exploration and development of deep formation.Reservoir is the main technical bottleneck.So a variety of geophysical researches should be carried out to describe the spatial distribution characteristics of reservoir accurately.Aiming at the problems of prediction in deep reservoir，comprehensive analysis methods and technological processes are established by taking deepwater turbidite fans of Chezhen Sag as an example，in which，lithologic association of reservoir is taken as a starting point to determine the dominant seismic response and reservoir prediction make based on it.The analysis methods and technical processes bring a good result in oil and gas exploration，and a set of effective technical methods are explored in prediction of deep buried glutenite. Related Articles | Metrics Select APPLICATION OF SHARPLITE THIN BED PROCESSING METHOD IN TAINAN GAS FIELD LI Tong-hua;MENG Xian-lu;MA Jian-hai;WU Jin-long;YANG Lei 西南石油大学学报(自然科学版)    2010, 32 (1): 57-62.   DOI: 10.3863/j.issn.1674-5086.2010.01.011 Abstract （767）      PDF（pc） （1141KB）（605）       Knowledge map    Save Tainan gas field is located at the central sag area of Qaidam Basin，Qinghai province，the field is very high in salinity，which results in very low reservoir resistivity，the reservoir rocks are dominated by thinly interbeded sandstone and mudstone.Because of the limitation of vertical resolution，conventional well logging curve can not really demonstrate the interbeded formation characteristics，which makes hydrocarbon recognition more difficult.The existing method improving vertical resolution of well logging curve is more placed on theory and geological data is lacking，the operability is poor.Sharplite thin bed processing method is presented by Schlumberger aiming at the situation mentioned above，high resolution well logging curve is obtained by integrating high resolution FMI images and conventional well logging curve to carry out reverse processing.The application in Tainan gas field shows the sharplite thin bed processing method can greatly improve the vertical resolution of conventional curves so as to effectively identify hydrocarbon in thin beds. Related Articles | Metrics Select PREDICT FAN DELTA SAND BODY BY USING MULTIATTRIBUTES VOLUME CLASSIFICATION TECHNOLOGY LANG Xiao-ling;PENG Shi-mi;KANG Hong-quan;ZHANG Feng-hong 西南石油大学学报(自然科学版)    2010, 32 (1): 65-66.   DOI: 10.3863/j.issn.1674-5086.2010.01.010 Abstract （1398）      PDF（pc） （1203KB）（697）       Knowledge map    Save Conventional neural network technology for seismic waveform classification by using one single seismic attribute is very difficult to be used to predict seismic facies and sand body distribution in low signal and noisy ratio areas.Seisfacies multiattribute volume classification technology is based on seismic wave theory，principal component analysis （PCA），hybrid classification method and selforganizing neural network technology，by using the principle of similarity to cluster analysis seismic attribute and also seismic facies are automatically analyzed.Thus a seismic facies classification volume is obtained.Integrated with well data，the seismic facies volume is analyzed in 3D visualization.It is better to predict reservoir sand body distribution in threedimensional space and greatly reduce uncertainty caused by single attribute seismic facies analysis.This technology is used in Wanzhuang area，Huabei Oilfield.Fan delta sand body distribution is correctly described，three prospective lithologic reservoirs are predicted clearly.Based on these results，well T12X and T47 were drilled and encountered thicker oil pays，which proved the multiattribute volume classification prediction results. Related Articles | Metrics Select THE QUANTITATIVE IDENTIFICATION OF SEDIMENTARY MICROFACIES OF CONGLOMERATE RESERVOIR HE Hui;WAN Bing-qian;TANG Hai-fa 西南石油大学学报(自然科学版)    2010, 32 (1): 67-72.   Abstract （769）      PDF（pc） （791KB）（576）       Knowledge map    Save The conventional way to identify sedimentary microfacies is mainly depending on sedimentary characteristics and well logging data to determine and divide well by well and interval by interval.Aiming at Badaowan heavy oil reservoir，Midwest Block II，Karamay Oilfield，based on the comprehensive analysis of sedimentary microfacies and lithofacies，as well as reservoir characteristics，the proluvial fan facies is identified and divided，according to quantitative lithology analysis，finely quantitative division of conglomerate heavy oil reservoir microfacies is carried out，the difference of lithologic and physical properties among the sandbodies of conglomerate oil reservoir microfacies is presented，the sedimentary model of midproluvial fan is summarized，the distribution law of the microfacies and lithofacies on plane is studied，geological data base of different sedimentary micro facieslithofacies reservoirs are established，it is indicated that braided channel course sandstone in mid fan and braided channel fine sandstone are the main oilbearing sand bodies. Related Articles | Metrics Select MOLECULAR DIFFUSION COEFFICIENT OF GASOIL SYSTEM UNDER THE CONDITION OF HIGH TEMPERATURE AND PRESSURE GUO Ping;WANG Zhou-hua;SHEN Ping-ping;DU Jian-fen 西南石油大学学报(自然科学版)    2010, 32 (1): 73-79.   DOI: 10.3863/j.issn.1674-5086.2010.01.013 Abstract （842）      PDF（pc） （674KB）（565）       Knowledge map    Save The molecular diffusion is an important factor to affect mass transfer phenomenon during a gas injection process.It is one of key parameters to determine the miscibility effectiveness of injected gas and oil system.Most of current commercial reservoir simulators for the phase behavior calculation are only based on the assumption that oil and injected gas system reaches equilibrium immediately once they contact each other.There is no diffusion phenomenon occurring between the two phases.Authors of this paper present the constant volume diffusion research for the fluid system which is of high concentration of CO2，CH4，N2 and the crude oil from surface separator.The study is to aim at the investigation of diffusing mechanism between oil and injected gas under the condition of high temperature and pressure.The results show that the oil and gas do not reach balance while contacting，it is related to the component diffusion velocity.The diffusion coefficient is not a constant，it increases as pressure decreases.Once the system reaches equilibrium，the diffusion coefficient will not change.The liquid properties are not the same because of different position.This research provides a new approach for phase study and valuable information for optimizing the gas injection process. Related Articles | Metrics Select A COMPUTING METHOD FOR LAYERED PRODUCTION CONTRIBUTION AND AFFECTING FACTORS ANALYZING IN COMMINGLED GAS RESERVOIRS LIU Qi-guo;WANG Hui;;WANG Rui-cheng;LI Xiao-chang 西南石油大学学报(自然科学版)    2010, 32 (1): 80-84.   DOI: 10.3863/j.issn.1674-5086.2010.01.014 Abstract （1374）      PDF（pc） （719KB）（677）       Knowledge map    Save Flowing mechanism in the layered gas reservoirs without crossflow is analyzed and a closed circle boundary mathematical model considering wellbore storage effect and skin effect established.The model was solved with Laplace domain space，and by using Stehfest inversion algorithm，the real analytical solution of dimensionless downhole pressure and the production contribution of each layer in layered gas reservoirs are finally obtained.It is indicated that 1，if ignoring skin effect，layer production contribution is nearly equal to βj before pressure wave reaches boundary and equal to ωj when pressure wave reaches boundary and pseudosteady state is arrived，2，if skin effect exists，layer production contribution is no longer equal to βj or ωj，generally speaking，the layer with larger skin factor will contribute less while the layer with smaller skin factor will contribute more.The research results are helpful to the selection of field technologic measures and proper production allocation of gas wells. Related Articles | Metrics Select REVIEW AND PROSPECT OF FINGERING PHENOMENON SIMULATION YANG Zhao-zhonga;LI Xiao-gangb;JIANG Hai;a;SUN Jiana 西南石油大学学报(自然科学版)    2010, 32 (1): 85-88.   DOI: 10.3863/j.issn.1674-5086.2010.01.015 Abstract （898）      PDF（pc） （223KB）（828）       Knowledge map    Save The phenomenon，so called “fingering”，exists in various displacements during oil/gas production and is essentially a kind of hydrodynamic instability.Thus，it is too difficult to be directly investigated.The history and recent status of the physical and mathematical/numerical simulation of fingering in oil/gas production and related fields are investigated.The application of theories of cellular automata and smoothed particle hydrodynamics to fingering simulation is especially introduced.Furthermore，the tendency of fingering simulation is demonstrated based on the recent limitations from improvement of physical models，latticeoff solution of mathematical/numerical models and cellular automata modeling of complicated fingering. Related Articles | Metrics Select THE RESEARCH ON FRACTURE EXTENSION MODEL FOR SECONDARY SANDING FRACTURING LI Yong-ming;LI Chong-xi;GUO Jian-chun;MAO Hu;SUN Zhao-xu 西南石油大学学报(自然科学版)    2010, 32 (1): 89-92.   DOI: 10.3863/j.issn.1674-5086.2010.01.016 Abstract （776）      PDF（pc） （197KB）（496）       Knowledge map    Save Due to the research on secondary sanding fracturing is in the stage of exploration，the relevant theory is deficient.The sand levee has formed during the first fracturing process，considering the effects of sand levee height change with time and on the fluid flow and proppant sedimentation，the fracture extension model of secondary sanding fracturing is established.The model includes the continuity equation of fluid flow，pressure drop equation，fracture width model and height model，in which the pressure drop model is based on the parallel plate theory and mechanical equilibrium principle.Different from the conventional pressure drop，the new model considers the effects of sand levee upon the fluid flow.Through the calculation by programming，the results show that the stimulation effect of secondary sanding fracturing is better than that of conventional fracturing，so the new model is worthy of popularization and application. Related Articles | Metrics Select A NEW FORMULA TO CALCULATE THE DELIVERABILITY OF HORIZONTAL WELL CHEN Xiao-fan;YUE Ping;SU Guo-feng;YANG Jian 西南石油大学学报(自然科学版)    2010, 32 (1): 93-96.   DOI: 10.3863/j.issn.1674-5086.2010.01.017 Abstract （767）      PDF（pc） （516KB）（531）       Knowledge map    Save Analytic method is an important approach to research the deliverability of the horizontal well.In analytical method based on the mathematical model，through the appropriate assumption to simplify the initial equation，the boundary conditions，the conformal mapping，image mapping，the principle of potential superposition and the equivalent flow resistance method are used to obtain the formula and it′s analytical solution.Based on the sufficient research on the development history and current situation of formula for calculating the horizontal well deliverability，through the simplifying and dividing the drainage area shape，processing the drainage region in threedimensional，following the rule of horizontal well flow，that plane flow in the far region and vertical radial flow near wellbore region，using the equivalent flow resistance method，a new formula for calculating horizontal well deliverability is obtained.The formula is simple and easy to understand，and compared with the classic formula，it is indicated that the new formula is reasonable and reliable. Related Articles | Metrics Select COMPOSITIONAL UPSCALING METHOD FOR NUMERICAL SIMULATION OF CARBONATE ROKE GAS CONDENSATE RESERVOIRS LI Yong;LI Bao-zhu;HU Yong-le;ZHANG Jing 西南石油大学学报(自然科学版)    2010, 32 (1): 97-100.   DOI: 10.3863/j.issn.1674-5086.2010.01.018 Abstract （819）      PDF（pc） （339KB）（571）       Knowledge map    Save In order to correctly stimulate the development performance of the carbonate rock watercontaining gas condensate reservoir with the triple media of pores，caverns and fractures，equivalent numerical simulation method，i.e.；adjustment compositional conduction coefficientαmethod is presented，which is suitable for compositional upscaling for the types of gas condensate reservoirs.The relationship of compositional coefficientαchanges as composition total molar fraction is calculated through setting up single media fine model for single rock block.Besides，the modeling result is correlated with geological factors upscaling and the rock block system gas recovery calculated by dual media model after geological factors upscaling and compositional upscaling.The consequences indicate that to triple media carbonate rock watercontaining gas condensate reservoir，there is bigger error if the dual media model by geological factors upscaling is directly used to simulate，and the dual media model by geological factors and compositional upscaling can correctly and equivalently simulate. Related Articles | Metrics Select THE RESEARCH OF MECHANISM OF IMBIBITION PROCESS IN CYCLIC WATER INJECTION LEI Deng-sheng;DU Zhi-min;FU Yu;ZHANG Yong 西南石油大学学报(自然科学版)    2010, 32 (1): 101-104.   DOI: 10.3863/j.issn.1674-5086.2010.01.019 Abstract （843）      PDF（pc） （441KB）（583）       Knowledge map    Save The process of displacement and imbibition is alternative in the cyclic water injection.If the time of imbibition is short than needed time，the balance of imbibition can not be attained，which makes insufficient exchange of fluid.Based on that，the concept of balance time is introduced，the one dimension core simulation is used，the mechanism of imbibition of practical reservoir is analyzed and the influence of viscosity ratio of oil and water，capillary，water saturation to balance time of imbibition are studied.The results show it will make the balance time increase for the big viscosity ratio of oil and water，small capillary and high water saturation，which will make the balance of imbibition be unable to be attained and the effect of cyclic water injection not good.Especially in the period of high water cut，owing to the high water saturation and low capillary pressure，the process of imbibition needs more time to attain balance.When the time of stopping production is less than the balance time of imbibition，the cyclic water injection would not achieve the expected effect.It offers the effective assist to the establishment of rational work system through the research of mechanism of imbibition in cyclic water injection. Related Articles | Metrics Select THE QUANTITATIVE DESCRIPTION OF RESERVOIR NUMERICAL SIMULATION FOR POLYMER FLOODING REMAINING OIL ZENG Xiang-ping 西南石油大学学报(自然科学版)    2010, 32 (1): 105-111.   DOI: 10.3863/j.issn.1674-5086.2010.01.020 Abstract （772）      PDF（pc） （845KB）（680）       Knowledge map    Save After polymer flooding，the distribution of the remaining oil is even more scattered .The description of the remaining oil is more difficult.The fine geologic model is built with polymer flooding pilot test in Gudao Oilfield.By means of reservoir numerical simulation，the distribution regularity and the affecting factors of the remaining oil after the polymer flooding are researched，the macroscopic distribution pattern of the remaining oil is proposed based on the contributing factor and the morphological classification，the remaining oil saturation and the relative reserves are quantitatively described.It is pointed out that the top of the thick pay zones and the detention area of pressure balance are the main abundance zones，the coefficient of reservoir variation，the formation crude oil viscosity，the interbed distribution and the amount of the polymer injected are the main factors affecting the flooding effectiveness.The deformed well network pattern exploitation and horizontal and vertical combination well pattern exploitation are simulated，the technological thought improving water flooding effectiveness after polymer flooding is presented.Case study indicates the result is valuable to guide future remaining oil description and production. Related Articles | Metrics Select DELIVERABILITY FORECAST FOR MULTILATERAL WELL PATTERN AND PARAMETER SENSITIVITY RESEARCH IN LOWPERMEABILITY RESERVOIRS ZHAO Jing;ZHAO Quan 西南石油大学学报(自然科学版)    2010, 32 (1): 112-116.   DOI: 10.3863/j.issn.1674-5086.2010.01.021 Abstract （763）      PDF（pc） （554KB）（582）       Knowledge map    Save According to the characteristics of nonDarcy flow and threshold pressure gradient in low permeability reservoirs，the deliverability prediction general formula for multilateral well pattern and the analytical model which is inverted fourspots pattern，inverted fivespots pattern，inverted sevenspots pattern and inverted ninespots pattern are established through water and electricity similarity principle and equivalent flow friction method.The data of field verification and numerical simulation experiment indicate that the forecasting precision of the models is very good.The effects of well pattern number and effective thickness and threshold pressure gradient are analyzed with the model.The result indicates that when threshold pressure gradient is increased，different well pattern productivity ratio of multilateral wells is decreased.With the increasing of L/d，productivity ratio of multibranched well is increased；when L/d is the same，with the increasing of well pattern number，productivity ratio of multilateral well is increased；with the increasing of effective thickness，productivity ratio of multilateral well is decreased. Related Articles | Metrics Select AN EXPERIMENTAL RESEARCH ON WATER INJECTION TO REPLACE THE OIL IN ISOLATED CAVES IN FRACTURECAVITY CARBONATE ROCK OILFIELD LI Shuang;LI Yun 西南石油大学学报(自然科学版)    2010, 32 (1): 117-120.   DOI: 10.3863/j.issn.1674-5086.2010.01.022 Abstract （891）      PDF（pc） （540KB）（624）       Knowledge map    Save There are multiple media characteristics in fracturecavity carbonate rock reservoir，its accumulative bodies are discontinuous in spatial distribution，the relationship of oil and water is complicated，there is an essential difference between the flowing mechanisms and the carbonate rock and sandstone reservoirs，which brings about difficult production.When gush can not be done by means of oil reservoir itself energy，and pumping can not lift crude oil up to surface，the water injection to replace oil is carried out to enhance formation energy to realize gush.Aiming at the water injection to replace oil technology in fracture cavity carbonate rock reservoir being just probed，there is no available means being able to be used directly，the technology should be practiced on the basis of dividing the reservoir into fracturecavity units by dynamically analyzing and predicting the reservoirs.In order to study the flow mechanism and water injection to replace oil mechanism for fracturecavity carbonate reservoir，a suitable way is explored and physical model established to experimentally study the recovery dynamic characteristics，the dynamic change of injection and recovery is obtained from dimensionless deliverability，dimensionless bottom hole flow pressure and water cut change curves. Related Articles | Metrics Select THE RESEARCH ON RESERVOIR VORONOI GRID CHEN Xiao-juna;CHEN Weib;DUAN Yong-gangc;LIU Bo-feng;ZHANG Jingb 西南石油大学学报(自然科学版)    2010, 32 (1): 121-124.   DOI: 10.3863/j.issn.1674-5086.2010.01.023 Abstract （822）      PDF（pc） （568KB）（558）       Knowledge map    Save Voronoi grid has the characteristics of strong flexibility and local orthogonal，the local refined grid and basic upscaling grid can be effectively integrated together，which meets the needs of reservoir numerical simulation applying in largescale upscalling simulation and locally fine description.The generating technology of Voronoi grid is analyzed and studied，a new generation way is presented，i.e.，the reservoir area is divided based on faults，well intervals and basic layers，different geometric model dot is used to different layers，at last，Voronoi grid is constructed with indirect way.From the aspect of calculating geometry，the layers are grouped into dot to dot，dot to line and line to line，and the corresponding solution is given out，the key is placed on the interference of faults to vertical wells and horizontal wells.The validity of the algorithm is verified through Voronoi grid model. Related Articles | Metrics Select THE EXPERIMENTAL STUDY ON THE THIOBACILLUS DESULFURIZATION APPLIED TO REMOVING HYDROGEN SULFIDE ZHAO Hui-jun;LIU Kai;LI Jun-ling 西南石油大学学报(自然科学版)    2010, 32 (1): 125-129.   DOI: 10.3863/j.issn.1674-5086.2010.01.024 Abstract （783）      PDF（pc） （523KB）（562）       Knowledge map    Save In this paper，such factors as concentration of sodium carbonate solution，pH value，temperature，intake rate，spray amount，residence time and thiobacillus desulfurization in the washing solution influencing on the desulfurization rate are inspected by single factor analysis，and initially defined the optimal conditions for the natural gas containing H2S（concentration≤1300mg/m3） are as following，pH value is 8~9，temperature 25℃~35℃，initial concentration of the sodium carbonate solution 5%，residence time 90s.The experimental results also indicate that the spray amount and the intake rate influences the desulfurization rate，the regenerative lye which enters absorption tower carries thiobacillus desulfurization，which can help to improve desulfurization rate. Related Articles | Metrics Select PREPARATION OF ENCAPSULATED BREAKER BY MEDIA DISPERSION AND PHASE SEPARATION HE Xian-ru;HAN Chao;WANG Xu;LI Ke;NUOBU Zha-xi 西南石油大学学报(自然科学版)    2010, 32 (1): 130-134.   DOI: 10.3863/j.issn.1674-5086.2010.01.025 Abstract （854）      PDF（pc） （644KB）（693）       Knowledge map    Save To the problem of gel breaking prematurely in fracturing operations，encapsulated breaker is produced with ammonium persulfate as the core and appropriate polymer materials as the coat by media dispersion and phase separation.Polyvinyl alcohol （PVA） and ethylene vinyl acetate copolymer （EVA） is selected as the coat materials by experimentation and comparing.The preparation technology is studied by orthogonal experiment.The result shows that the performance of encapsulated breaker can be influenced by the stirring rate，temperature，mass ratio of coat and core materials，mass fraction of coat materials in solution and dispersant mass fraction.For the encapsulated breaker with coat materials of PVA，the optimal preparation conditions are the temperature is at 25℃，the stirring rate at 270r/min，the mass ratio of coat and core material at 2∶8，and the dispersing agent mass fraction at 1%.For the encapsulated breaker with coat materials of EVA，the optimal preparation conditions are the temperature is at 25℃，the stirring rate at 300r/min，the mass fraction of coat materials in solution at 5%，and the dispersing agent at 2%. Related Articles | Metrics Select INVESTIGATION ON BEHAVIOR OF CATALYTIC CRACKING REACTION FOR EMULSIFYING HEAVY OIL XU Ge;YANG Ji-he;LU Zhen-guang;LIN Ting;YUN Zhi 西南石油大学学报(自然科学版)    2010, 32 (1): 135-137.   DOI: 10.3863/j.issn.1674-5086.2010.01.026 Abstract （737）      PDF（pc） （161KB）（545）       Knowledge map    Save To improve the heavy oil atomization situation of FCC feed stock and decrease the yield of carbon and dry gas，the feed stock，heavy oil，is emulsified.Selecting and adjusting composition of emulsifier are studied.The effect of reactive temperature is observed with emulsifying heavy oil for FCC productive distribution.As a result，Emulsifier Span (S-1)，combination of S-1 and polyoxyethylene ether (O-3) diary，S-1/O-3 and Tween (T-2) ternary combinative emulsifier are satisfactory emulsifiers.In comparison with the heavy oil before emulsification，the reactive temperature can be reduced by 10℃，the light oil yield of emulsified heavy oil increases by 1.2%~5.6%，but the coke yield decreases obviously.The study above suggests that the yield of FCC light oil can increases，the yield of coke decreases with emulsifying stuff，and the process is of definite industry application prospect. Related Articles | Metrics Select THE INFLUENCE OF DIFFERENT SOLVENTS ON MICROSHAPE IN PbS NANOCRYSTALLITES PREPARATION ZHOU Pei;SHU Ying 西南石油大学学报(自然科学版)    2010, 32 (1): 138-140.   DOI: 10.3863/j.issn.1674-5086.2010.01.027 Abstract （638）      PDF（pc） （401KB）（573）       Knowledge map    Save In recent years，nanocomposite materials have been widely applied in the fields of petroleum chemical engineering and chemical engineering catalyst.The synthesis of PbS nanocrystallites from an airstable singlesource molecular precursor （lead diethyldithiocarbamate：PbDDTC） under mild conditions is achieved by two simple steps，firstly，the PbDDTC is directly prepared through the precipitation reaction of lead acetate and sodium diethyldithiocarbamate in distilled water at room temperature，secondly，without the use of any extra surfactant/template，pure PbS nanocrystallites with different shape can be obtained just via solvothermal decomposition of the PbDDTC in four different solvents （including water，ethanol，ethylene glycol，ethylenediamine）.The obtained PbS nanocrystallites with the diameter of 50~100nm are characterized by XRay Diffractometer（XRD），Scanning Electronic Microscope（SEM）and Transparent Electronic Microscope（TEM），etc.It is proved that the obtained crystallites are pure PbS nanocrystallites with the diameter of 100~200nm.The selection of different solvents has an influence on the feature of the products. Related Articles | Metrics Select EXPERIMENTAL STUDY ON COMPOSITE REPAIR WELDING ON STRENGTHENING THE SURFACE OF STEEL TOOTH ROLLER CONE BIT HUANG Ben-sheng;FAN Zhou;TANG An-jun;YANG Mei;LIU Qing-you 西南石油大学学报(自然科学版)    2010, 32 (1): 141-144.   DOI: 10.3863/j.issn.1674-5086.2010.01.028 Abstract （745）      PDF（pc） （418KB）（544）       Knowledge map    Save Composite repair welding layers with diamond are obtained by Repair Welding with Composite welding rod containing diamond and Carbide through O2-C2H2 flaming.Morphology of composite repair welding layers and diamond surface after metalizing are analyzed with optical microscope and XRD，and bonding strength between repair welding layers and substrate and wear resistance of repair welding layers are tested by material testing machine and abrasion tester.The results show that diamond surface after metalizing has certain metallicity and wettability.The complex layers are compacted and wellproportioned，the shear strength of which is 625MPa and wear value is reduced by 10%～70%.The complex layers prolong the working life of steel tooth roller cone bit. Related Articles | Metrics Select DRILLABILITY BASED ON LEAST SQUARES SUPPORT VECTOR MACHINE XIE Xiang-jun;ZHANG Hu;FAN Xiang-yu 西南石油大学学报(自然科学版)    2010, 32 (1): 145-147.   DOI: 10.3863/j.issn.1674-5086.2010.01.029 Abstract （900）      PDF（pc） （169KB）（579）       Knowledge map    Save Drillability has a direct impact on the determination of drill bit type selection and drilling rate forecast，the major oil fields at home and abroad for the determination of lithology are very serious.However，suitability for the conditions of oil and gas wells drillability has not yet been completely resolved.In the bit type selection，based on the current domestic difficulties and problems that exist，the use of LS-SVM to strike a drillability practical method is presented.Logging data are selected as parameter，with LS-SVM Support Vector Machine technology，drillability mathematical model is built，and the model is applied to well DU4 SC Oilfield and good result achieved. Related Articles | Metrics Select EMULATION STUDY ON ROCKBREAKING MECHANISM OF PERCUSSIONROTARY BIT HUANG Zhi-qiang;FAN Yong-tao;WEI Zhen-qiang;TAN Li;BU Yan 西南石油大学学报(自然科学版)    2010, 32 (1): 148-150.   DOI: 10.3863/j.issn.1674-5086.2010.01.030 Abstract （867）      PDF（pc） （461KB）（594）       Knowledge map    Save The process of establishing the finite element model of the bitrock interaction in the percussionrotary drill is introduced.What′s more，the process of the rockbreaking by the percussionrotary bit under rotating impact and simple impact load is emulated with computer，then the process is described herein.The related depthtime and volumetime contrasting curves when the bits break rocks are obtained，and the rockbreaking mechanism of the percussionrotary bit is concluded.The process of the rockbreaking under rotating impact can be divided into four phases，the depth of the rockbreaking is mainly decided by impact effect but not the effect of rotary，rockbreaking volume under rotating impact is about twice as large as that under simple impact load .Therefore，the theoretic foundations for the further use of percussionrotary bit in the oil industry are provided. Related Articles | Metrics Select DOWN HOLE FLOW MEASUREMENT BASED ON VENTURI FENG Ding;XU Guan-jun;HUANG Chao-bin 西南石油大学学报(自然科学版)    2010, 32 (1): 151-154.   DOI: 10.3863/j.issn.1674-5086.2010.01.031 Abstract （802）      PDF（pc） （349KB）（619）       Knowledge map    Save The metering and controlling of down hole flow have become an important and indispensable technology in oilfield development and the intelligent oilfield technology，the correlative data which are measured by them can provide a reliable theoretical basis for the production and management of the oilfield.Bases on the metering technology of three phase mixed measurement the working principles of the down hole Venturi flow measurement is introduced in this paper，the working process discussed and a new flow measurement device which can adapt to the complex down hole environment developed，especially，the calculation of the hardware part clearly derived.This device，whose structure is simple，no plugin is needed，no interference with the fluid flow with a little pressure loss，it is not apt to be affected by the change of fluid properties，is easy to install，safe and reliable，high in precision and suitable for down hole flow measurement and control. Related Articles | Metrics Select APPLICATION OF ANSYS TO SEISMIC TIMEHISTORY RESPONSE ANALYSIS ON CABLESUSPENDED PIPELINE BRIDGE GAO Jian;WANG De-guo;HE Ren-yang;GENG Dai 西南石油大学学报(自然科学版)    2010, 32 (1): 155-159.   DOI: 10.3863/j.issn.1674-5086.2010.01.032 Abstract （953）      PDF（pc） （468KB）（711）       Knowledge map    Save The cablesuspended pipeline bridge between Wangyao heating station and Yangshan oil transportation station，Changqing Oilfield，is taken as example，ANSYS is applied to set up analytical model，timehistory analysis is used to carry out nonlinear seismic response study.Seismic wave is input in axial，transverse and vertical directions respectively to analyze the stress feature of the engineering structure under three types of conditions，the antiearthquake ability in different directions is obtained.The third and fourth classes sites seismic waves is considered as input，the conditions of different earthquake intensity，displacement and stress value of key structure locations while uniform input and traveling wave effect existing are all taken into consideration，and the timehistory curve is used to directly express the change of the parameters as time.The stress feature and law of cablesuspended pipeline bridge under the conditions of different earthquake intensity are probed，the weak points are figured out and corresponding measurement presented. Related Articles | Metrics Select THE ROOF BOLT MECHANIC ANALYSIS OF THE PIPELESS HYDRAULICFEEDBACKTYPE PUMPING TECHNOLOGY FENG Guo-qiang;HAN Qi-qing;TENG Guo-quan;LI Shao-fu;FENG Guo-yong 西南石油大学学报(自然科学版)    2010, 32 (1): 160-164.   DOI: 10.3863/j.issn.1674-5086.2010.01.033 Abstract （917）      PDF（pc） （417KB）（619）       Knowledge map    Save In view of the problems of roof bolt downpass difficulty existing in traditional beam pump production with tubingless production system，the stress situation of oil pumping roof bolt of hydraulic feedback pump in the up and downpass is analyzed，and the roof bolt dynamics analysis model of hydraulic feedback pump is set up.Based on the model and optimization design technology of production system，the major influencing factors of system operation including stroke，pump diameter and oil viscosity is analyzed，and the general law of pumping parameter selection of this technology is obtained.The contrasting analysis with traditional pump is carried out through practical example，hydraulic feedback pump stress in roof bolt，torque power of pumping unit and the roof bolt fatigue intensity etc.may all well improve operational mode index.Also，it can improve the economic level of oilfield production. Related Articles | Metrics Select STUDY ON THE MECHANISM OF INCREASING ROP & BOREHOLE STABILITY OF FASTER PENETRATION DRILLING FLUID YANG Yu-ping;SUN Jin-sheng;YANG Zhi;LU Yun-hu;JIANG Si-qing 西南石油大学学报(自然科学版)    2010, 32 (1): 165-169.   DOI: 10.3863/j.issn.1674-5086.2010.01.034 Abstract （1024）      PDF（pc） （344KB）（713）       Knowledge map    Save During the process of drilling operation，the penetrated formation rocks are firstly exposed to drilling fluids，if the fluids which can ensure borehole stability can effectively decreases rock strength instantaneously，the rate of penetration will be considerably increased.The natural cores with different permeability are soaked in KSZJ fluids with different concentration for different duration，the changes of instantaneous rock strength and final strength shows KSZJ can penetrate into the cracks of the rocks at higher permeable rate and larger permeable volume，so as to enhance the stress off crack tip and make the cracks quickly extend，the strength of rocks in broken up instantaneously，so the stress of crack tip is enhanced，the cracks are forced to quickly extend as to the stress is broken up instantaneously，the rockbreaking efficiency is improved and rate of penetration increased.As the increase of the soaking duration，the core stress increases quickly and tends to stability，which is favorable for borehole stability and well bore regularity.The KSZJ technology was used to test device of jetting drilling simulator to penetrate the rocks with different hardness and the insitu test in well 12688，Hailar Basin，results show KSZJ fluid technology effectively solves the problem of borehole instability and the mean rate of penetration is considerably increased. Related Articles | Metrics Select SEDIMENTARY MICROFACIES FEATURE AND THE RESERVOIR PERMEABILITY UNITS IN CARBONIFEROUS，SHAGUANPING，EASTERN SICHUAN XU Guo-sheng;WANG De-bin;WANG Qing-peng;ZHOU Lian-de;ZHANG Rui 西南石油大学学报(自然科学版)    2010, 32 (1): 170-174.   DOI: 10.3863/j.issn.1674-5086.2010.01.035 Abstract （988）      PDF（pc） （1053KB）（623）       Knowledge map    Save The Carboniferous gas reservoir is the key one in Shaguanping gas field，eastern Sichuan，it belongs to fractureporetyped gas reservoir.It is critically important to divide reservoir units that study systematically the internal texture，spatial allocation and sedimentary facies model of Huanglong Formation and identify the distribution law of the units.Based on the data of geology，well logging and thin sections，by using sedimentary system analysis，lithologic facies association and sedimentary environment of Huanglong Formation are studied in detail，three subfacies and eight microfacies are figured out，all the sedimentary features and conditions of the subfacies are researched.The reservoir permeability units in Carboniferous gas reservoirs are grouped into highmedium permeable zones and low permeable zone，in general，the units appear “high permeability internally and low permeability marginally”.The division provides scientific reference for middlelate period development. Related Articles | Metrics Select EVOLUTION OF ABNORMAL PRESSURE AND HYDROCARBON ACCUMULATION IN FEIXIANGUAN FORMATION IN THE NORTHEASTERN SICHUAN BASIN GUO Min;LI Zhong-dong;YANG Lei;ZHANG Jian 西南石油大学学报(自然科学版)    2010, 32 (1): 175-182.   DOI: 10.3863/j.issn.1674-5086.2010.01.036 Abstract （893）      PDF（pc） （620KB）（580）       Knowledge map    Save According to the relations between the distribution of the formation pressure and the characteristics of gas reservoir，which is showed by pressure data measured in Feixianguan Formation，reservoir pressure genetic mechanism，evolution and the relationship of hydrocarbon accumulation of various gas pools are analyzed.Normal pressure systems always develop in reefbank complex on carbonate platform margin，most of reservoir rocks are dolostone，the main reservoir type is poretype，and gas pools are always low in methane and high in hydrogen sulfide.Abnormal high pressure or extra high pressure system appears constantly in ocean trough section or inside platform where lacks dolostone，reservoir rocks are dominated by limestone，and the main gas pool is fractured gas reservoir with high methane content，exclude or include very small amount of hydrogen sulfide.To development of pressure in fractured reservoirs and porous reservoirs，there is different evolutional mechanism，porous reservoirs experienced the stage of normal pressure in Late IndoChinese epochEarly Yanshan movement，and went through the stage of abnormal pressure which was formed by liquid hydrocarbon cracking into gas in Mid Late Yanshan movement，TSR reaction and function along with uplift shaped in Himalayan movement made the porous reservoir pressure reduce into normal stress system，and fall into a pattern with normal gas reservoir pressure.Fractured reservoirs experienced highpressure formed by hydrocarboncharging in MidLate Yanshanian movement，and experienced highpressure gas reservoir phase which was generated by structural compression function in Late Yanshanian movement，the stage of extra high pressure gas reservoir stereotyped by strong extrusion tectonics in late Himalayan. Related Articles | Metrics Select RESERVOIR BITUMEN′S IMPACT ON RESERVOIR PHYSICAL PROPERTY AND RESERVOIR PRODUCTIVITY CHEN Shi-jia WANG Ming-fa LU Jun-gang FAN Xiao-jun YANG Guo-ping 西南石油大学学报(自然科学版)    2010, 32 (2): 1-6.   DOI: 10.3863/j.issn.1674-5086.2010.02.001 Abstract （924）      PDF（pc） （519KB）（511）       Knowledge map    Save The bitumen filling in reservoir makes porosity and permeability decrease and more inhomogeneous.Santai-northern Santai of Junggar Basin is taken as example，the reservoir samples with different bitumen content are soaked with organic solvent，the physical property contrast before and after soaking is conducted，the influence of bitumen on the physical property is analyzed.It is recognized that bitumen will greatly decrease reservoir porosity and permeability，especially fine sandstone reservoir and the sandstone reservoir with a lot of fillings.It is pointed out that the bitumen is one of the factors which makes reservoirs low productivity.The research on the reservoirs with bitumen is valuable for enhancing oil productivity. Related Articles | Metrics Select THE DISTRIBUTION CHARACTERISTICS OF CLAY MINERALS AND RESERVOIR SENSITIVITY IN THE LOWER SECTION OF XINGOUJU FORMATION CHEN Gong-yang ZHANG Ling ZHOU Chao-yu 西南石油大学学报(自然科学版)    2010, 32 (2): 7-12.   DOI: 10.3863/j.issn.1674-5086.2010.02.002 Abstract （830）      PDF（pc） （345KB）（601）       Knowledge map    Save The combination and distribution of clay minerals in lower section of Xingouju Formation of Jiangling sag are obviously controlled by the sedimentary environment，kaolinite exists only in delta plain facies，the minerals are characterized by illite，kaolinite，ordered to disordered illite/montmorillonite mixing layer and small amount of chlorite.The clay minerals combination in delta front facies include illite，chlorite and ordered illite/montmorillonite mixing layer.The two main clay minerals in prodelta and lacustrine mudstone are illite and chlorite.The sensitivity test result shows that the reservoir has medium velocity sensitivity，strong-superstrong water sensitivity，strong salt sensitivity and strong acid sensitivity in the study area. Related Articles | Metrics Select A HIGH ACCURACY NUMERICAL ALGORITHM FOR WAVEFRONT TIME COMPUTATION IN 3-D COMPLEX MEDIA HUANG Yue-qin ZHANG Jian-zhong 西南石油大学学报(自然科学版)    2010, 32 (2): 13-18.   DOI: 10.3863/j.issn.1674- Abstract （808）      PDF（pc） （449KB）（582）       Knowledge map    Save The wavefront marching methods based on level-sets，such as FMM(fast marching method) and GMM(group marching method) are widely used as an effective scheme of computing the wavefront time in complex media.The precision of traveltime at grid points，calculated with finite-difference solutions of Eikonal equation，is rather low when the sizes of discrete grids are large.In order to improve the precision of wavefront time calculation，a higher accuracy algorithm of wavefront time computation in 3-D inhomogeneous media is presented based on GMM method and Fermat Principle，with traveltime on arbitrary positions represented by bilinear interpolation functions of the known wavefront time on the grid nodes in each cuboid cell.Numerical simulation shows that the method can not only improve the computational accuracy greatly，but also be strong in stability and flexibility in complex media. Related Articles | Metrics Select LITHOLOGY IDENTIFICATION AND PREDICTION OF IGNEOUS ROCKS BASED ON 3-D LITHOFACIES MODELLING CHEN Ke-yong;DUAN Xin-guo;ZHANG Xiao-bing;SONG Rong-cai 西南石油大学学报(自然科学版)    2010, 32 (2): 19-24.   DOI: 10.3863/j.issn.1674-5086.2010.02.004 Abstract （894）      PDF（pc） （519KB）（553）       Knowledge map    Save There is abundant natural gas resources in Changling No.1 Gas Field，most of it is accumulated in igneous rock reservoirs of Yingcheng Formation.The igneous rocks of the Formation are dominated by acidic igneousrocks with the characteristics of complex lithology.Well developed pore-vug-fracture are hard to predict.The key issue constraining the development of the igneous rock reservoirs is if the lithology can be correctly identified and predicted.Aiming at the issue of unclear understanding of the lithology and lithofacies within the area，by means of fully use of the effective data such as core，imaging well logging，cutting and conventional logging，as well as neural network technology，lithofacies interpretation model of single well is established.On the basis of it，the strategy of igneous lithofacies modeling is presented，by integrating the deterministic modeling with stochastic modeling，the 3-D lithofacies distribution model of igneous rocks is set up.The spatial distribution prediction of lithology is carried out，which provides the evidence for the development of the reservoirs. Related Articles | Metrics page Page 1 of 5 Total 191 records First page Prev page Next page Last page