The whole-aperture pore structure characteristics and its effect on gas content of the Longmaxi Formation shale in the southeastern Sichuan basin

被引：0

作者：

Jiang Z. ^{[1
,2
]}

Tang X. ^{[1
,2
]}

Li Z. ^{[1
,2
]}

Huang H. ^{[1
,2
]}

Yang P. ^{[1
,2
]}

Yang X. ^{[1
,2
]}

Li W. ^{[1
,2
]}

Hao J. ^{[3
]}

机构：

[1] State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing

[2] Unconventional Natural Gas Research Institute, China University of Petroleum (Beijing), Beijing

[3] Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing

来源：

| 2016年 / Science Frontiers editorial department卷 / 23期

关键词：

Gas content; Longmaxi Formation; Pore structure; Shale gas; Southeastern Sichuan Basin; Whole-aperture;

D O I：

10.13745/j.esf.2016.02.013

中图分类号：

学科分类号：

摘要：

Since shale gas mainly occurs in shale pores, research on the pore structure characteristics is key to understand shale gas accumulation mechanism. Based on the experiments of CO2 adsorption, N2 adsorption, CH4 isothermal adsorption and high pressure mercury injection, the whole-aperture pore structure of the Longmaxi Formation shale is characterized in the Southeastern Sichuan Basin and the controlling effects of pore structure on the gas content are explained. Micropores (<2.0 nm), mesopores (2.0-50.0 nm) and macropores (>50.0 nm) are developed in shale samples, and the distribution characters change obviously in each sample. In the aspect of pore volume, the mesopores have the biggest contribution to the whole pore volume, taking about 40.8%. It is followed by micropores, taking about 34.7%. The macropores have the minimum proportion in the whole pore volume, only taking 24.5%. In the aspect of surface area, the micropores have an absolute advantage in the whole surface area, accounting for about 76.87%. The second is mesopores, taking about 23.05%. The macropores only provide surface area of 0.07%. The main pore volume is provided by mesopores and micropores, which controls the content of free gas. The surface area of micropores has a good positive correlation with the largest CH4 adsorption contents, and makes up the main surface area in shale samples, which controls the content of adsorbed gas. The macropores are not dominant in pore volume and surface area, and its influence on the content of adsorbed gas and free gas is relatively weak. But the macropores can be the main channels for shale gas seepage. Therefore, understanding the distribution characteristics of micropores, mesopores and macropores, especially the contribution of micropores on the enrichment of adsorbed gas and free gas, has an important guiding significance to the shale gas exploration and development. © 2016, Editorial Office of Earth Science Frontiers. All right reserved.

引用

页码：126 / 134

页数：8

共 5 条

[1] Tang X., Jiang Z., Li Z., Et al., The effect of the variation in material composition on the heterogeneous pore structure of high-maturity shale of the Silurian Longmaxi Formation in the southeastern Sichuan Basin, China, Journal of Natural Gas Science and Engineering, 23, pp. 464-473, (2015)
[2] Clarkson C.R., Solano N., Bustin R.M., Et al., Pore structure characterization of North American shale gas reservoirs using USANS/SANS, gas adsorption, and mercury intrusion, Fuel, 103, pp. 606-616, (2013)
[3] Slatt R.M., O'Brien N.R., Pore types in the Barnett and Woodford gas shales: Contribution to understanding gas storage and migration pathways in fine-grained rocks, AAPG Bulletin, 95, 12, pp. 2017-2030, (2011)
[4] Drummond C., Israelachvili J., Surface forces and wettability, Journal of Petroleum Science and Engineering, 33, 1, pp. 123-133, (2002)
[5] Sing K.S.W., Reporting physisorption data for gas/solid systems with special reference to the determination of surface area and porosity (Recommendations 1984), Pure and Applied Chemistry, 57, 4, pp. 603-619, (1985)

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