Numerical study of multi-period palaeotectonic stress fields in Lower Cambrian shale reservoirs and the prediction of fractures distribution: A case study of the Niutitang Formation in Feng'gang No. 3 block,South China |
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| Institution: | 1. Mining College, Guizhou University, Guiyang 550025, China;2. School of Resource and Environmental Engineering, Guizhou University, Guiyang 550025, China;3. ARC Centre of Excellence for Geotechnical Science and Engineering, The University of Newcastle, Australia, University Drive, Callaghan, NSW 2308, Australia;4. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong;5. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;6. Guizhou Natural Gas Energy Investment Corporation, Guiyang 550081, China;1. School of Energy Resources, China University of Geosciences, Beijing 100083, China;2. Key Laboratory of Strategic Evaluation of Shale-gas Resources, Ministry of Land and Resources, Beijing 100083, China;3. Key Laboratory of Geological Evaluation and Development Engineering of Unconventional Natural Gas Energy, Beijing 100083, China;4. College of Energy Resource, Chengdu University of Technology, Chengdu, Sichuan 610059, China;1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, 102249, China;2. Unconventional Natural Gas Institute, China University of Petroleum, Beijing, 102249, China;3. Unconventional Petroleum Collaborative Innovation Center, China University of Petroleum, Beijing, 102249, China;4. Research Institute of Petroleum Exploration and Development, Beijing, 100083, China;5. Research Institute of Shanxi Yanchang Petroleum(Group)Co., Ltd, Xi''an, Shanxi, 710075, China;1. Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, China;2. School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China;3. Guizhou Research Center of Shale Gas and Coalbed Methane Engineering Technology, Guiyang 550009, China;1. Mining College, Guizhou University, Guiyang 550025, China;2. School of Resource and Environmental Engineering, Guizhou University, Guiyang 550025, China;3. College of Civil Engineering, Guizhou University, Guiyang 550025, China;1. School of Energy Resources, China University of Geosciences, Beijing 100083, China;2. Key Laboratory for Marine Reservoir Evolution and Hydrocarbon Abundance Mechanism, Ministry of Education, China University of Geosciences, Beijing 100083, China;3. Key Laboratory for Shale Gas Exploration and Assessment, Ministry of Land and Resources, China University of Geosciences, Beijing 100083, China;4. Unconventional Oil & Gas Exploration and Development Headquarters, East China Petroleum Bureau of Sinopec, Nanjing 210011, China;5. Hainan Geological Survey, Haikou 570206, China |
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| Abstract: | Fractures not only control the distribution of oil and gas reservoirs, but also are key points in the research of oil and gas reservoir development programmes. The tectonic fractures in the Lower Cambrian shale reservoirs in the Feng'gang No. 3 block are effective reservoir spaces for hydrocarbon accumulation, and these fractures are controlled by palaeotectonic stress fields. Therefore, quantitatively predicting the development and distribution of tectonic fractures in the Lower Cambrian shale reservoir is important for the exploration and exploitation of shale gas in the Feng'gang No. 3 block. In the present study, a reasonable geological, mechanical and mathematical model of the study area was established based on the faults systems interpreted from seismic data, fracture characteristics from drilling data, uniaxial and triaxial compression tests and experiments on the acoustic emissions (AE) of rocks. Then, a three-dimensional (3-D) finite element method is applied to simulate the palaeotectonic stress field with the superposition of the Yanshan and Himalayan movements and used to predict the fracture distribution. The simulation results indicate that the maximum principal stress value within the study area ranged from 269.97 MPa to 281.18 MPa, the minimum principal stress ranged from 58.29 MPa to 79.64 MPa, and the shear stress value ranged from 91.05 MPa to 106.21 MPa. The palaeotectonic stress field is controlled by the fault zone locations. The fracture development zones are mainly controlled by the tectonic stress fields and are located around the faults, at the end of the fault zones, at the inflection point and at the intersection of the fault zones. |
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| Keywords: | Tectonic fractures Niutitang formation shale Numerical simulation Fracture distribution Palaeotectonic stress field |
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