In-situ stress state in the Linxing region,eastern Ordos Basin,China: Implications for unconventional gas exploration and production |
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| Affiliation: | 1. Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process of the Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu, China;2. School of Resources and Geosciences, China University of Mining and Technology, Xuzhou, Jiangsu, China;3. Department of Energy Resources Engineering, Stanford University, Stanford, CA, USA;4. Department of Geophysics, Stanford University, Stanford, CA, USA;5. School of Mines, China University of Mining and Technology, Xuzhou, Jiangsu, China;1. School of Resource and Earth Science, China University of Mining and Technology, Xuzhou 221116, Jiangsu Province, China;2. Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, China University of Mining and Technology, Ministry of Education, Xuzhou 221008, Jiangsu Province, China;3. Exploration and Development Research Institute of Huabei Oilfield, Renqiu 062550, Shanxi Province, China;4. Yuncheng Vocational and Technical College, Yuncheng 044000, Shanxi Province, China;5. Tiefa Mining Group, Tieling 112700, Liaoning Province, China;1. School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China;2. Key Laboratory of Coalbed Methane Resources & Reservoir Formation Process, China Ministry of Education, Xuzhou 221116, China;3. State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210046, China;4. Centre for Tectonics, Resources and Exploration, University of Adelaide, SA 5005, Australia;5. School of Earth Sciences and Resources, China University of Geosciences Beijing, Beijing 100083, China;6. Innovative Research Center of Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;1. School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, PR China;2. Key Laboratory of Coalbed Methane Resources & Reservoir Formation Process, Ministry of Education of China, Xuzhou 221116, PR China;3. Key Laboratory of Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, PR China;4. Centre for Tectonics, Resources and Exploration, University of Adelaide, SA 5005, Australia;5. School of Earth Sciences and Resources, China University of Geosciences Beijing, Beijing 100083, China;6. Nanjing Institute of Geology and Mineral Resources, China Geological Survey, Nanjing 210016, PR China;7. Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;1. Key Laboratory of Coalbed Methane Resource and Reservoir Formation Process, China University of Mining and Technology, Ministry of Education, Xuzhou 221116, China;2. School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China;3. General Prospecting Institute, China National Administration of Coal Geology, Beijing 100039, China |
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| Abstract: | The Carboniferous and Permian sedimentary rocks (mainly the Shanxi and Taiyuan formations) in the Linxing region, eastern Ordos Basin, China, host a significant volume of unconventional gas resources (coalbed methane, shale gas and tight sandstone gas). Currently, the in-situ stress state is poorly understood but knowledge of this is extremely important for a range of applications, such as gas exploration and production, fracture stimulation and wellbore stability. The maximum horizontal stress (SHmax), minimum horizontal stress (Shmin) and vertical stress (Sv) magnitudes, and the SHmax orientation in the Linxing region were systematically analyzed for the first time in the present study, which can provide a reference for subsequent numerical simulation and hydraulic fracturing design. Based on borehole breakouts and drilling-induced tensile fractures interpreted from borehole imaging logs, the SHmax orientation rotates from ∼NEE-SWW-trending in the southern part to ∼ NWW-SEE-trending in the northern part of the Linxing region. Both conventional logs and extended leak-off tests were used for stress magnitude determination. The results revealed three types of in-situ stress fields (Sv > SHmax > Shmin, SHmax > Sv > Shmin and SHmax > Sv ≈ Shmin), and a dominant strike-slip stress regime (SHmax > Sv ≥ Shmin) was found for the entire well section in the target Shanxi Formation and Taiyuan Formation in the Linxing region. In addition, differential stress increased with depth in the Linxing region, which indicates that wellbore instability might be a potentially significant problem when drilling wells that are vertical or ∼ N-S-trending. |
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| Keywords: | In-situ stress Unconventional gas resource Stress orientation Stress magnitude Linxing region Ordos basin |
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