Journal of Southwest Petroleum University(Science & Technology Edition)

DIAGENESIS AND POROSITY EVOLUTION OF UPPER PERMIAN REEF IN TIANFU CHONGQING SICHUAN

Gna Yihua

1988, 10(1): 1-12. DOI: 10.3863/j.issn.1000-2634.1988.01.001

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This paper studies the diagenesis of Upper Permian reefs in Tianfu area, Chongqing, Sichuan. Microcrystalization, interstitial sedimentation, cementation, dolomitization, silification, solution, neomorphism, compaction, pressure solution are formed in this area.Four diagenetic environments, i.e.the submarine, the meteoric phreatic and vadose, the shallow buried and deep buried, and epidiagesis environments are determined by the diagenetic features in the diagenetic history of reefs.The evolution of porosity isdiscussed by combing the diagenesis of carbonate rocks with the geological history of Sichuan Basin.

STUDY OF SUPERMINIATURE TEXTURES AND FOSSILS IN CARBONATE ROCKS UNDER AN ELECTRON MICROSCOPE

Sun Fengyu

1988, 10(1): 13-23. DOI: 10.3863/j.issn.1000-2634.1988.01.002

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With the help of TEM, superminiature fossils, micropores, microfissures, crystalization forms and grain sizes of rocks, and their contact relation between them in carbonate rocks and siliceous rocks of different ages are observed,analyzed and studied in this paper. These superminiature textures and fossils are of great importance to discovering further the mys- tery of rocks and strata, prospecting petroleum and other minerals, and discussing the life origin, the development of micropaleontology, and the formation mechanism of hardbodies of living thinges,and so on.

HIERARCHICAL OPTIMIZATION OF DEVELOPMENT PLANNING FOR COMPLEX GROUPED OIL-GAS CONDENSATE RESERVOIRS

Liao yizhu Ge Jiali

1988, 10(1): 24-33. DOI: 10.3863/j.issn.1000-2634.1988.01.003

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For complex grouped oil-gas condensate reservoirs with crude oil and bottom water, this paper, based on the studies and solutions of the comprehensive technico-economical problems involved in the development,not only presents and achieves the thought of local optimal development planning for single reservoirs using dynamic programing, but also creates and preliminarily utilizes the thought of overall optimal development planning for complex grouped reservoirs using hierarchical decision-making and hierarchical control principles in large-scale system.

AN EXPERIMENTAL STUDY ON THE CHEMICAL KINETICS OF ACID—CARBONATITE REACTION

Zhao Ligiang

1988, 10(1): 34-41. DOI: 10.3863/j.issn.1000-2634.1988.01.004

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Acidization is an important measure of going into production and of stimulation in carbonate oil and gas reservoirs.A successful acidization depends upon the technical level of its job and treatment design. Making the complete and accurate design of acidizing treatment depends on selecting the design parameters.The results from our experimental study on the chemical kinetics of the reaction of acid on reservoir rocks have been partly given out in this paper. By analyzing these results, we have obtained some conclusions that are useful for practical acidizing job and treatment design.

MATHEMATICAL MODEL AND COMPUTER SIMULATION OF A WILD WELL

Liu Kai

1988, 10(1): 42-51. DOI: 10.3863/j.issn.1000-2634.1988.01.005

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The formation and the wellbore are considered as an associated system in this paper. The mathematical model for calculating the parameters of formation pressure, gas blowout capacity, total gas volume erupted, bottom hole pressure and pressure in each point of formation etc. in a wild gas well has been proposed by utilizing the reservoir gas filtration mechanism in unsteady state.It s computer simulation method has been proposed and some meaningful data have been obtained.

FRACTURE CRITERION OF THE MIXED MODE CRACK PROPAGATION IN THE THREE-DIMENSIONAL MEDIUM

Yi Xianzhong Xiao Fangchun

1988, 10(1): 52-67. DOI: 10.3863/j.issn.1000-2634.1988.01.006

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Fracture criterion is the fundation and norm of judging whether the working state is steady. Consequently, beginning with the analysis of mixed mode crack problems in the three-dimensional medium, and having considered the effect of little plastic yield zone near a crack tip on breaking, this paper suggests two new dual-parameter fracture criterions(Fe criterion and Ee criterion), They are rather identical with the experimental data.

DESIGN OF HIGH SPEED CIRCLE DECIMAL ANALOG TO DIGITAL CONVERTER

Wang Benji

1988, 10(1): 68-76. DOI: 10.3863/j.issn.1000-2634.1988.01.007

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A design program of a new typical and high speed analog to digital converter is given in this paper so as to meet the requirement of the fast conversion for the multi-channel signal detective system.By converting an analog with it, the decimal digital expression of analog(-9.9999v+9.9999v)is obtained.The binary digital expression can also be obtained.At the same time, the detailed description of the basic principle, the main circuit, the converting speed and accuracy etc.is presented in this paper.

AN OPERATOR SERIES METHOD FOR SOLVING A LINEAR DETERMINED SOLUTION PROBLEM

Wu Xiaoqing Dong Fengcheng

1988, 10(1): 77-84. DOI: 10.3863/j.issn.1000-2634.1988.01.008

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In Reference literature[1], it is easier to obtain the solutions to, initialboundary value problems of some partial defferential equations by. using an operator series method. In this paper, we extend the results in[1]to more general cases so that we can make use of the operator series method to solve much more determined-solution problems(such as Cauchy problems of differential and differential-integral equations,semi-unbounded problems, initalboundary value problems and so on).

FEATURES OF GRAVITY FLOW SEDIMENTS OF LOWER S₃^4-2 SECTION IN GUAN-JIUZHOU REGION, LONGFANG-GUAN DEPRESSION

Zhong Dakang

1988, 10(1): 85-96. DOI: 10.3863/j.issn.1000-2634.1988.01.009

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Longfang-Guan depression is located in the north part of Jizhong Graben where the North China oil-field lies. It is a monofault and dustpan- shaped basin formed during the end of Mesozoic.In the steep side of the basin(i.e.Guan--Jiuzhou region),a trench face gravity flow deposition with the feature of a fan shape arises.From the observation of the core and mainsupport mechanism of sediments,gravity flows in this area can be classified into debris flow, grain flow and turbidity current.

DEPOSITS OF SEDIMENT GRAVITY FLOW OF THE 3 D MEMBER OF SHAHEJIE FORMATION IN HUANG HUA DEPRESSION

Zhao Hanqing

1988, 10(1): 97-106. DOI: 10.3863/j.issn.1000-2634.1988.01.010

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In S3 phase Huang Hua depression was in a period of intense fault and subside.There widely existed the deposits of debris flow,clastic flow, grain flow, turbite flow and slumping, They made up three kinds of deposition systems of near bank fan, subqueous near bank fan and sublake fan in the main form of the normal cycle sequence. Mainly taking Bai Ge Zhuang---Lou Zhan, Yang Er Zhuang and Gang Zhong districts for example, this paper makes detailed research on the deposition characteristics of gravity flow, the evolution,the contribution and deposition models of all kinds of fan systems.

DEEP WATER CARBONATE OF THE DEVONIAN IN PUAN-QIANCHANG,QUIZHOU

Wei Kuisheng

1988, 10(1): 107-113. DOI: 10.3863/j.issn.1000-2634.1988.01.011

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In Puan-Qianchang of Guizhou Province, the middle and late Devonian sedimentary rocks were mainly developed during the Devonian Period.In this region principally cropped out carbonate rocks, a few silieilith and terrigenous clastic sediments.All sediments, which consist of carbonate breccias, argillaceous limestones, mudstones, wackstones, packstones, reef rocks, argillites and silicilithes are about 1,056 meters thick, and are about 83% of carbonate rock.

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