Pore Water and Its Influences on the Nanopore Structures of Deep Longmaxi Shales in the Luzhou Block of the Southern Sichuan Basin, China

Haitao Gao, Peng Cheng, Wei Wu, Shenyang Liu, Chao Luo, Tengfei Li, Kesu Zhong and Hui Tian
Additional contact information
Haitao Gao: State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
Peng Cheng: State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
Wei Wu: Research Institute of Shale Gas, PetroChina Southwest Oil and Gas Fields, Chengdu 610002, China
Shenyang Liu: Research Institute of Shale Gas, PetroChina Southwest Oil and Gas Fields, Chengdu 610002, China
Chao Luo: Research Institute of Shale Gas, PetroChina Southwest Oil and Gas Fields, Chengdu 610002, China
Tengfei Li: State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
Kesu Zhong: Research Institute of Shale Gas, PetroChina Southwest Oil and Gas Fields, Chengdu 610002, China
Hui Tian: State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China

Energies, 2022, vol. 15, issue 11, 1-20

Abstract: In the Luzhou Block of the southern Sichuan Basin, the deep Longmaxi shales have become important exploration targets in recent years. However, the water-bearing properties of these shales are still unclear, which significantly limits evaluations of reservoir pore structures and gas-in-place (GIP) contents. In this study, twelve fresh shale core samples were collected at the well site, and the pore water (C PW ) and equilibrium water (C EW ) contents, as well as the pore structures of the shales, were analyzed under both as-received and dried conditions. The results indicate that the deep shales have low water-bearing extents with a pore water content (C PW ) of 3.82–16.67 mg/g, and that both the organic matter (OM) and inorganic matter (IM) pores can be used for pore water storage. The extent of influence of pore water on nonmicropores and IM pore structures is more significant than that on micropores and OM pore structures. Meanwhile, the pore water obviously reduces the retention effects of nanopores and may block nanopores with pore widths < 0.5 nm. An average of 40% of pore spaces were taken up by pore water in the studied deep shales in the Luzhou Block, and the residual pore surface area and pore volume of the shales were mainly contributed from micropores and nonmicropores, respectively.

Keywords: deep shales; pore water; Longmaxi Formation; nanopore structures; Luzhou Block (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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