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ORIGINAL RESEARCH article
Front. Earth Sci.
Sec. Solid Earth Geophysics
Volume 13 - 2025 |
doi: 10.3389/feart.2025.1505090
This article is part of the Research Topic Advances in Petrophysics of Unconventional Oil and Gas View all 4 articles
Multifractal characteristics of pore structure in the terrestrial shale reservoirs of the Lianggaoshan Formation in Northeast Sichuan Basin and its Geological Significance
Provisionally accepted
Jiping Wang 1
hongmei Shao 1*
Zhang YUANHAO 2* Zhenxue Jiang 2* Bo Gao 1* lingling Li 1* Huifang Pan 1* Haonan Wang 1* Xi Lu 1* Hengyuan Qiu 3* Xiaobiao He 2*
Chengju Zhang 2- 1 China Petroleum Daqing Oilfield Exploration and Development Research Institute, Daqing, China
- 2 State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China
- 3 Chengdu Exploration and Development Research Institute of PetroChina Daqing Oilfield Company LTD, Chengdu, China
Abstract：The exploration of shale oil resources in the Lianggaoshan Formation of the Jurassic System in the Sichuan Basin has made significant progress in recent years, revealing a vast resource potential. This study focuses on the upper Lianggaoshan Formation, employing low-temperature gas adsorption, high-pressure mercury intrusion, and nuclear magnetic resonance techniques to systematically characterize the pore structure of various lithofacies shales. Furthermore, the pore structure heterogeneity and its controlling factors were investigated through the integration of multifractal theory. Result indicate that high-organic laminated felsic shale exhibit well-developed micropores with a simple and uniform pore structure, making them ideal for shale oil accumulation.Medium-organic bedded felsic shale, also exhibiting laminated and feldspathic textures, possess a more complex mesoporous structure that facilitates hydrocarbon enrichment, but their high heterogeneity presents challenges for exploration and development. Low-organic massive argillaceous siltstone with low organic content demonstrates a complex macroporous structure and high heterogeneity, potentially limiting effective hydrocarbon recovery. Lastly, the pore structure of massive fine-silt sandstone exhibits a high degree of complexity and heterogeneity, revealing the significant influence of quartz and clay mineral interactions on pore development. These findings advance the understanding of shale pore structure and its impact on hydrocarbon enrichment and recovery in the Lianggaoshan Formation, and offer valuable guidance for optimizing "sweet spot" selection. Furthermore, the methodologies and insights presented here are broadly applicable to unconventional resource exploration and development in similar geological settings globally, providing new ideas for researchers studying shale reservoir pore systems.
Keywords: Lianggaoshan Formation, Shale oil, Nuclear Magnetic Resonance, Multifractal characteristics, Pore structure
Received: 02 Oct 2024; Accepted: 17 Jan 2025.
Copyright: © 2025 Wang, Shao, YUANHAO, Jiang, Gao, Li, Pan, Wang, Lu, Qiu, He and Zhang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence:
hongmei Shao, China Petroleum Daqing Oilfield Exploration and Development Research Institute, Daqing, China
Zhang YUANHAO, State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China
Zhenxue Jiang, State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China
Bo Gao, China Petroleum Daqing Oilfield Exploration and Development Research Institute, Daqing, China
lingling Li, China Petroleum Daqing Oilfield Exploration and Development Research Institute, Daqing, China
Huifang Pan, China Petroleum Daqing Oilfield Exploration and Development Research Institute, Daqing, China
Haonan Wang, China Petroleum Daqing Oilfield Exploration and Development Research Institute, Daqing, China
Xi Lu, China Petroleum Daqing Oilfield Exploration and Development Research Institute, Daqing, China
Hengyuan Qiu, Chengdu Exploration and Development Research Institute of PetroChina Daqing Oilfield Company LTD, Chengdu, China
Xiaobiao He, State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, China
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