In situ stress field evaluation of deep marine tight sandstone oil reservoir: A case study of Silurian strata in northern Tazhong area,Tarim Basin,NW China |
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| Institution: | 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 Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Beijing Normal University, Beijing 100875, China;2. Beijing Engineering Research Center for Watershed Environmental Restoration & Integrated Ecological Regulation, Beijing 100875, China;3. University of Naples ‘Parthenope’, Department of Science and Technology, Centro Direzionale, Isola C4, 80143, Naples, Italy;1. School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China;2. Coal Reservoir Laboratory of National CBM Engineering Center, Beijing 100083, 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. Beijing Key Laboratory of Unconventional Natural Gas Geology Evaluation and Development Engineering, China University of Geosciences, Beijing 100083, China;4. Key Laboratory for Shale Gas Exploitation and Assessment, Ministry of Land and Resources, China University of Geosciences, Beijing 100083, China;5. Oil Recovery Plant No.3, Zhongyuan Oilfield Co. Ltd., SINOPEC, Puyang 066004, China;1. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China;1. State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing 210046, China;2. Department of Chemistry, The University of Texas, El Paso, TX 79968, United States;3. Environmental Science and Engineering Ph.D. Program, The University of Texas at El Paso, El Paso, TX 79968, United States;4. University of California Center for Environmental Implications of Nanotechnology (UC CEIN), The University of Texas at El Paso, El Paso, TX 79968, United States;1. Department of Public Service and Management, Anhui Business Vocational College, Hefei, Anhui 231131, PR China;2. School of Management, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, PR China;3. Dongwu Business School, Soochow University, 50 Dongwu Road, Suzhou, Jiangsu 215021, PR China |
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| Abstract: | Deep marine tight sandstone oil reservoirs are the subject of considerable research around the world. This type of reservoir is difficult to develop due to its low porosity, low permeability, strong heterogeneity and anisotropy. A marine tight sandstone oil reservoir is present in the Silurian strata in the northern Tazhong area of the Tarim Basin, NW China, at a depth of more than 5000 m. The porosity is between 6% and 8%, and the gas permeability is between 0.1 and 1 × 10?3 μm2. The features of this type of reservoir include the poor effects of conventional fracturing modifications and horizontal wells, which can lead to stable and low levels of production after staged fracturing. Here, we conduct a comprehensive evaluation of the mechanical properties of the rock and the in situ stress of the target tight sandstones by using numerous mechanical and acoustic property tests, conducing crustal stress analysis and using data from thin section observations. The dispersion correction technique is used to transform velocity at the experimental high frequency (1 MHz) to velocity at the logging frequency (20 kHz). The logging interpretation models of the transverse wave offset time, mechanical parameters and in situ stress are calculated, and each model represents a high precision prediction. Simulating the in situ stress field of the Silurian strata using a three-dimensional finite element method demonstrates that the average error between the simulation result and the measured value is less than 6%. The planar distribution of each principal stress is mainly controlled by the burial depth and fault distribution. By conducting in situ stress orientation analysis for the target layer via the analysis of paleomagnetism, borehole enlargement, fast shear wave orientation and stress field simulation, we show that the direction of the maximum horizontal stress is N45E. In this paper, a typical and successful comprehensive evaluation of the stress field of the deep tight sandstone oil reservoir is provided. |
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| Keywords: | Tarim basin Northern Tazhong area Tight sandstone oil reservoir In situ stress field |
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