Control of lithofacies on pore space of shale from Longmaxi Formation, southern Sichuan Basin

被引：0

作者：

Wang X. ^{[1
]}

Liu L. ^{[1
]}

Wang Y. ^{[1
]}

Sheng Y. ^{[1
]}

Zheng S. ^{[1
]}

Luo Z. ^{[1
]}

机构：

[1] College of Geosciences, China University of Petroleum, State Key Laboratory of Petroleum Resources and Prospecting, Beijing

来源：

Shiyou Xuebao/Acta Petrolei Sinica | 2019年 / 40卷 / 10期

关键词：

Longmaxi Formation; Organic matter pore; Pore structure; Pore type; Shale lithofacies; Surface porosity;

D O I：

10.7623/syxb201910005

中图分类号：

学科分类号：

摘要：

The pore types of shale, quantitative characterization of pore structures and control factors of pore spaces are important topics in research of shale reservoir. The shale lithofacies of Longmaxi Formation in the southern Sichuan Basin can be classified into siliceous shale, mixed shale and argillaceous shale according to the mineral composition. The pore types, structural characteristics and control factors of pore spaces of different shale lithofacies of Longmaxi Formation in the southern Sichuan Basin were analyzed by technologies of quantitative evaluation of minerals by scanning electron microscopy (QEMSCAN), low temperature N2 and CO2 adsorption and high pressure mercury intrusion experiments. The results show that the argillaceous shale is mostly characterized by the sheet-like intragranular pores of clay minerals and filled with the migrated organic matters; the mixed shale is rich in organic matter pores and carbonate dissolved macropores; siliceous shale is rich in organic matter pores. The total surface porosities of shale is mainly provided by the pores with the diameter of 0-500 nm. The surface porosity of minerals (except carbonate and feldspar)and organic matters are mainly contributed by intragranular pores. The surface porosity of organic matter is up to 32.37%, 8 to 16 times higher than that of mineral particles. The mesopores of shale are the main contributors to the pore volume, while micropores make a major contribution to the specific surface area of pores. The average surface porosity, pore volume and pore specific surface area of mixed shale are similar to those of siliceous shale, which means the mixed shale has potential storage capacity. The pore space of mixed shale and siliceous shale with high TOC content is mainly controlled by organic matter pores, but the pore space of argillaceous shale with lower TOC content is mainly controlled by organic matter pores and illite mineral related pores. © 2019, Editorial Office of ACTA PETROLEI SINICA. All right reserved.

引用

页码：1192 / 1201

页数：9

共 24 条

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