Pore structure evolution and geological controls in lacustrine shale systems with implications for marine shale reservoir characterization

被引：0

作者：

Hu Li ^{[1
]}

Ziqiang Xu ^{[2
]}

Xiaodan Gao ^{[3
]}

Jiatong Xie ^{[4
]}

Qirong Qin ^{[5
]}

Haijun Wang ^{[6
]}

Shun He ^{[1
]}

机构：

[1] Sichuan University of Science and Engineering,School of Economics

[2] Southwest Petroleum University),State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation

[3] Sichuan University of Science and Engineering,Sichuan Engineering Technology Research Center for High Salt wastewater Treatment and Resource Utilization

[4] Sichuan University of Science and Engineering,Sichuan Key Provincial Research Base of Intelligent Tourism

[5] Southwest Petroleum University,School of Geoscience and Technology

[6] CNPC Tarim Oilfield Branch Company,undefined

[7] Sinopec Exploration Company,undefined

来源：

Scientific Reports | / 15卷 / 1期

关键词：

Lacustrine shale; Pore structure evolution; Diagenetic controls; Nitrogen adsorption analysis; Unconventional reservoirs;

D O I：

10.1038/s41598-025-02415-y

中图分类号：

学科分类号：

摘要：

Understanding pore structure evolution in lacustrine shale systems provides critical insights for marine shale reservoir characterization. This study presents an integrated petrological and petrophysical analysis of a representative lacustrine shale succession, employing low temperature nitrogen adsorption (LTNA), whole rock X-ray diffraction (XRD), and scanning electron microscopy (SEM). The study shows that (1) Clay-dominated pore systems evolve through distinct pathways compared to marine shales, with illite/smectite mixed-layer minerals generating abundant mesopores through diagenetic transformation. (2) Organic matter- dominated pores display limited connectivity due to Type III kerogen characteristics and hydrocarbon generation-induced pore occlusion, contrasting with marine shale systems dominated by Type II kerogen. (3) Comparative analysis demonstrates that lacustrine shales preserve 30–40% higher micro-mesopore volumes than their marine counterparts under similar thermal maturity conditions, attributed to enhanced clay mineral diagenesis in freshwater environments. These findings provide a new framework for understanding pore structure development in non-marine depositional systems and provide valuable analogs for marine shale reservoir evaluation, particularly in transitional marine-lacustrine basins.

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