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ORIGINAL RESEARCH article
Front. Earth Sci.
Sec. Solid Earth Geophysics
Volume 13 - 2025 | doi: 10.3389/feart.2025.1530002
This article is part of the Research Topic Geophysics and Petrophysics Issues Involved in Unconventional Oil and Gas Development Processes View all 7 articles
Evaluation Methods and Engineering Applications of In-Situ Stress in Deep, Strong Heterogeneity Terrestrial Shale Oil and Gas Reservoirs: A Case Study of Jurassic Shales in the Yingshan-Pingchang Area, Northeast Sichuan
Provisionally accepted
Shujun Yin 1* Jianliang Zhang 1* Hucheng Deng 2,3* Hao Qin 1* Wenhao Xia 1*
Yu Du 2* Ming Gong 2*
Tao Huang 2 Chang Li 2*- 1 China Petroleum Daqing Oilfield Exploration and Development Research Institute, Daqing, China
- 2 Chengdu University of Technology, Chengdu, China
- 3 State Key Laboratory of Oil and Gas Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan Province, China
The Jurassic terrestrial shale in the Yingshan-Pingchang area of the northeastern Sichuan Basin holds substantial exploration and development potential. However, the area exhibits significant vertical heterogeneity and anisotropy in in-situ stress. Thus, precise vertical evaluation of in-situ stress is urgently required to provide a scientific basis for selecting hydraulic fracturing layers in future operations. This study conducted a detailed in-situ stress analysis utilizing paleomagnetic data, velocity anisotropy measurements, differential strain experiments, hydraulic fracturing results, and both conventional and specialized logging data. A transversely isotropic insitu stress prediction model was developed to evaluate the stress distribution, aiming to identify target layers favorable for hydraulic fracturing. Comprehensive analysis indicates that the in-situ stress orientation of Jurassic shale in the Yingshan-Pingchang area generally aligns with the regional stress orientation (NE90°±10°). Due to the influence of local NW-trending structures, the in-situ stress orientation exhibits a clockwise deflection. In the Jurassic formation, the maximum
Keywords: Terrestrial shale oil and gas, Strong heterogeneity, in-situ stress orientation and magnitude, VTI formation, Transversely isotropic
Received: 18 Nov 2024; Accepted: 14 Feb 2025.
Copyright: © 2025 Yin, Zhang, Deng, Qin, Xia, Du, Gong, Huang and Li. 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:
Shujun Yin, China Petroleum Daqing Oilfield Exploration and Development Research Institute, Daqing, China
Jianliang Zhang, China Petroleum Daqing Oilfield Exploration and Development Research Institute, Daqing, China
Hucheng Deng, Chengdu University of Technology, Chengdu, China
Hao Qin, China Petroleum Daqing Oilfield Exploration and Development Research Institute, Daqing, China
Wenhao Xia, China Petroleum Daqing Oilfield Exploration and Development Research Institute, Daqing, China
Yu Du, Chengdu University of Technology, Chengdu, China
Ming Gong, Chengdu University of Technology, Chengdu, China
Chang Li, Chengdu University of Technology, Chengdu, China
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