宜宾地区页岩微孔特征及吸附解吸特性研究

doi:10.11885/j.issn.1674-5086.2017.07.26.04

摘要/Abstract

摘要： 选取四川宜宾地区志留系龙马溪组页岩，对总有机碳、黏土矿物含量等储层性质进行表征。利用扫描电镜、高压压汞法、低温氮气吸附-解吸法和二氧化碳气体吸附法对孔隙结构特征进行定性和定量分析。采用质量法对页岩样品进行不同温度时的等温吸附和解吸实验，结合吸附势理论对吸附解吸过程进行解释。结果表明，页岩样品TOC较高，页岩样品主要以微孔为主，介孔次之，大孔发育较少；微孔和介孔的发育增大了页岩的表面积，提供了更多的吸附位，有利于页岩气的吸附。页岩样品等温吸附曲线表明，随着压力的增大，吸附量先迅速增大而后逐渐趋于稳定，解吸曲线与吸附曲线相似并存在滞后现象；TOC与页岩吸附性能有着较好的正相关性；吸附势能曲线中势能零点与吸附曲线的拐点基本一致，通过吸附势的变化可以解释吸附解吸过程中页岩气的赋存状态。

关键词: 页岩气, 微孔特征, 等温吸附, 等温解吸, 吸附势

Abstract: Shales of the Silurian Longmaxi Formation in the Yibin Region, Sichuan, were investigated and their geological parameters, including total organic carbon (TOC) contents and clay mineral contents, were measured. Scanning electron microscopy, high pressure mercury injection, low temperature nitrogen adsorption-desorption, and carbon dioxide gas adsorption methods were employed to qualitatively and quantitatively analyze pore structure characteristics. The mass method was utilized to conduct isothermal adsorption and desorption experiments on shale samples at different temperatures and adsorption and desorption processes were explained using the adsorption potential theory. The results demonstrate that these shale samples have relatively high TOC contents, and pore structures are dominated by micropores, followed by mesopores and macropores. Connected micropores and mesopores increase surface areas of shales, and provide more adsorption spaces, thus facilitating adsorption of shale gas. The isothermal adsorption curves of the shale samples reveal that as the pressure increases, the adsorption volume increases rapidly at first and then levels off gradually. The desorption curves resemble the adsorption ones, but show some delays. The TOC contents indicate relatively good positive correlations with the adsorption performances of shales. The zero-potential point of the absorption potential curve is generally consistent with the turning point of the adsorption curve. The occurrence of shale gas during adsorption and desorption can be explained by variations in adsorption potentials.

Key words: shale gas, micropore characteristic, isothermal adsorption, isothermal desorption, adsorption potential

中图分类号:

TE122

岳长涛, 李术元, 许心怡, 马跃, 杨飞. 宜宾地区页岩微孔特征及吸附解吸特性研究[J]. 西南石油大学学报(自然科学版), 2018, 40(5): 84-94.

YUE Changtao, LI Shuyuan, XU Xinyi, MA Yue, YANG Fei. Micropore Characteristics and Adsorption and Desorption Properties of Shales in the Yibin Region[J]. 西南石油大学学报(自然科学版), 2018, 40(5): 84-94.

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参考文献

[1] 王飞宇,贺志勇,孟晓辉,等. 页岩气赋存形式和初始原地气量(OGIP)预测技术[J]. 天然气地球科学, 2011, 22(3):501-510. WANG Feiyu, HE Zhiyong, MENG Xiaohui, et al. Occurrence of shale gas and prediction of original gas inplace(OGIP)[J]. Natural Gas Geoscience, 2011, 22(3):501-510.
[2] CURTIS J B. Fractured shale-gas systems[J]. AAPG Bulletin, 2002, 86(11):1921-1938.
[3] GRIESER W V, SHELLEY R F, SOLIMAN M Y. Predicting production outcome from multi-stage, horizontal barnett completions[C]. SPE 120271-MS, 2009. doi:10.-2118/120271-MS
[4] ZHAO Tianyi, NING Zhengfu, ZENG Yan. Comparative analysis of isothermal adsorption models for shales and coals[J]. Xinjiang Petroleum Geology, 2014, 35(3):319-323. doi:10.11911/syztjs.201503018
[5] BREYER J A. Shale reservoirs-giant resources for the 21st century[M]. Tulsa:American Association of Petroleum Geologists, 1989.
[6] 邹才能,陶士振,侯连华,等. 非常规油气地质[M]. 北京:地质出版社, 2011:128-164.
[7] 杨宇宁,王剑,郭秀梅,等. 渝东北田坝地区五峰-龙马溪组页岩矿物学特征及其油气地质意义[J]. 沉积学报,2017,35(4):772-780. doi:10.14027/j.cnki.cjxb.-2017.04.011 YANG Yuning, WANG Jian, GUO Xiumei, et al. Mineralogical characteristics and petroleum geological significance of Wufeng-Longmaxi Formation shale in the Tianba Area, Northeast of Chongqing[J]. Acta Sedimentologica Sinica, 2017, 35(4):772-780. doi:10.14027/j.cnki.cjxb.-2017.04.011
[8] 吴伟,谢军,石学文,等. 川东北巫溪地区五峰组-龙马溪组页岩气成藏条件与勘探前景[J]. 天然气地球科学,2017,28(5):734-743. doi:10.11764/j.issn.1672-1926.2017.04.009 WU Wei, XIE Jun, SHI Xuewen, et al. Accumulation condition and exploration potential for Wufeng-Longmaxi shale gas in Wuxi Area, northeastern Sichuan Basin[J]. Natural Gas Geoscience, 2017, 28(5):734-743. doi:10.-11764/j.issn.1672-1926.2017.04.009
[9] 刘忠宝,高波,冯动军,等. 上扬子地区下寒武统黑色页岩矿物组成特征及其油气勘探意义[J]. 天然气工业,2017,37(4):21-26. doi:10.3787/j.issn.1000-0976.-2017.04.003 LIU Zhongbao, GAO Bo, FENG Dongjun, et al. Mineral composition of the Lower Cambrian black shale in the Upper Yangtze region and its significance in oil and gas exploration[J]. Natural Gas Industry, 2017, 37(4):21-26. doi:10.3787/j.issn.1000-0976.2017.04.003
[10] SHAO Xinhe, PANG Xiongqi, LI Qianwen, et al. Pore structure and fractal characteristics of organic-rich shales:A case study of the Lower Silurian Longmaxi shales in the Sichuan Basin, SW China[J]. Marine & Petroleum Geology, 2017, 80:192-202. doi:10.1016/j.marpetgeo.2016.-11.025
[11] WANG Qingtao, LU Hong, WANG Taoli, et al. Pore characterization of Lower Silurian shale gas reservoirs in the Middle Yangtze region, central China[J]. Marine & Petroleum Geology, 2016. doi:10.1016/j.marpetgeo.2016.12.-015
[12] CHALMERS G R, BUSTIN R M, POWER I M. Characterization of gas shale pore systems by porosimetry, pycnometry, surface area, and field emission scanning electron microscopy/transmission electron microscopy image analyses:Examples from the Barnett, Woodford, Haynesville, Marcellus, and Doig units[J]. AAPG Bulletin, 2012, 96(6):1099-1119. doi:10.1306/10171111052
[13] AMBROSE R J, HARTMAN R C, CAMPOS M D, et al. New pore-scale considerations for shale gas in place calculations[C]. SPE 131772-MS, 2010. doi:https://doi.-org/10.2118/131772-MS
[14] LOUCKS R G, REED R M, RUPPEL S C, et al. Morphology, genesis, and distribution of nanometer-scale-pores in siliceous mudstones of the Mississippian Barnett Shale[J]. Journal of Sedimentary Research, 2009, 79(12):848-861. doi:10.2110/jsr.2009.092
[15] 王玉满,董大忠,李建忠. 川南下志留统龙马溪组页岩气储层特征[J]. 石油学报, 2012, 33(4):551-561. doi:10.7623/syxb201204003 WANG Yuman, DONG Dazhong, LI Jianzhong, et al. Reservoir characteristics of shale gas in Longmaxi Formation of the Lower Silurian, southern Sichuan[J]. Acta Petrolei Sinica, 2012, 33(4):551-561. doi:10.-7623/syxb201204003
[16] 孙仁远,张云飞,范坤坤,等. 页岩中黏土矿物吸附特性分子模拟[J]. 化工学报, 2015, 66(6):2118-2122. doi:10.11949/j.issn.0438-1157.20141766 SUN Renyuan, ZHANG Yunfei, FAN Kunkun, et al. Molecular simulations of adsorption characteristics of clay minerals in shale[J]. CIESC Jorunal, 2015, 66(6):2118-2122. doi:10.11949/j.issn.04381157.20141766
[17] FISHMAN N S, HACKLEY P C, LOWERS H A. The nature of porosity in organic-rich mudstones of the Upper Jurassic Kimmeridge Clay Formation, North Sea, offshore United Kingdom[J]. International Journal of Coal Geology, 2012, 103(23):32-50. doi:10.1016/j.coal.2012.-07.012
[18] GUO Tonglou, ZHANG Hanrong. Formation and enrichment mode of Jiaoshiba shale Gas Field, Sichuan Basin[J]. Petroleum Exploration & Development, 2014, 41(1):31-40. doi:10.1016/S1876-3804(14)60003-3
[19] GUO Xusheng, LI Yuping, LIU Ruobing, et al. Characteristics and controlling factors of micropore structures of the Longmaxi Shale in the Jiaoshiba Area, Sichuan Basin[J]. Natural Gas Industry B, 2014, 1(2):165-171. doi:10.-1016/j.ngib.2014.11.007
[20] ANGULO R F, ALVARADO V, GONZALEZ H. Fractal dimensions from mercury intrusion capillary tests[C]. SPE 23695-MS, 1992. doi:https://doi.org/10.2118/23695-MS
[21] JOYNER L G, BARRETT E P, SKOLD R. The deter-mination of pore volume and area distributions in porous substances. Ⅱ. Comparison between nitrogen isotherm and mercury porosimeter methods[J]. Journal of the American Chemical Society, 1951, 73(1):373-380. doi:10.-1021/ja01151a046
[22] ISO 15901-3. Pore size distribution and porosity of solid materials by mercury porosimetry and gas adsorption-Part 3:Analysis of micropores by gas adsorption[S]. ISO copyright office. 2007
[23] NEIMARK A V, RAVIKOVITCH P I. Capillary condensation in MMS and pore structure characterization[J]. Microporous & Mesoporous Materials, 2001, 44-45(1):697-707. doi:10.1016/S1387-1811(01)00251-7
[24] 刘小平,董谦,董清源,等. 苏北地区古生界页岩等温吸附特征[J]. 现代地质, 2013, 27(5):1219-1224. doi:10.3969/j.issn.1000-8527.2013.05.026 LIU Xiaoping, DONG Qian, DONG Qingyuan, et al. Characteristics of methane isothermal adsorption for Paleozoic shale in Subei Area[J]. Geoscience, 2013, 27(5):1219-1224. doi:10.3969/j.issn.10008527.2013.05.026
[25] GUO Shaobin. Experimental study on isothermal adsorption of methane gas on three shale samples from Upper Paleozoic strata of the Ordos Basin[J]. Journal of Petroleum Science and Engineering, 2013, 110:132-138. doi:10.1016/j.petrol.2013.08.048
[26] ROSS D J K, BUSTIN R M. The importance of shale composition and pore structure upon gas storage potential of shale gas reservoirs[J]. Marine and Petroleum Geology, 2009, 26(6):916-927. doi:10.1016/j.marpetgeo.2008.06.-004
[27] ROSS D J K, BUSTIN R M. Sedimentary geochemistry of the Lower Jurassic Gordondale Member, northeastern British Columbia[J]. Bulletin of Canadian Petroleum Geology, 2006, 54(4):337-365. doi:10.2113/gscpgbull.54.4.-337
[28] ROSS D J K, BUSTIN R M. Impact of mass balance calculations on adsorption capacities in microporous shale gas reservoirs[J]. Fuel, 2007, 86(17-18):2696-2706. doi:10.-1016/j.fuel.2007.02.036
[29] HICKEY J J, HENK B. Lithofacies summary of the Mississippian Barnett Shale Mitchell 2 T.P. Sims Well, Wise County, Texas[J]. AAPG Bulletin, 2007, 91(4):437-443. doi:10.1306/12040606053
[30] 熊健,刘向君,梁利喜,等. 基于吸附势理论的页岩吸附甲烷模型及其应用[J]. 成都理工大学学报(自然科学版),2014,41(5):604-611. doi:10.3969/j.issn.1671-9727.2014.05.10 XIONG Jian, LIU Xiangjun, LIANG Lixi, et al. Adsorption model of shale to CH₄ based on adsorption potential theory and its application[J]. Journal of Chengdu University of Technology (Science & Technology Edition), 2014, 41(5):604-611. doi:10.3969/j.issn.16719727.2014.05.10
[31] 高然超. 基于吸附势理论的构造煤甲烷吸附[D]. 郑州:河南理工大学, 2012.
[32] 刘保安,董云会,刘晓芳. Polanyi吸附势理论的热力学推导[J]. 山东建材学院学报, 1999, 13(2):105-108. doi:10.3969/j.issn.1671-3559.1999.02.004 LIU Baoan, DONG Yunhui, LIU Xiaofang. Breifly deduced of polanyi adsorption potential theory[J]. Journal of Shandong Institute of Building Material, 1999, 13(2):105-108. doi:10.3969/j.issn.16713559.1999.02.004