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Controls of strike-slip fault on fractures:Insight from 3D discrete element simulation

Science China Earth Sciences 2024年第1期67卷 146-164页

作者： Lianbo ZENG Zhe MAO Guoping LIU He TIAN Yingtao YAO Kewei ZU Shaoqun DONG Mehdi OSTADHASSAN State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing 102249China College of Geosciences China University of Petroleum(Beijing)Beijing 102249China Institute of Energy Peking UniversityBeijing 100871China Exploration and Development Research Institute Zhongyuan Oilfield Branch CompanySINOPECZhengzhou 457001China Northeast Petroleum University Daqing 163318China

The fracture-cave reservoirs controlled by strike-slip faults are the main targets for oil and gas exploration of ultradeep carbonate in the Tarim *** is of great significance to clarify the distribution rules of fractures related to strike-slip faults for guiding the exploration and development of ultra-deep oil and *** this study,six groups of strike-slip fault 3D models based on discrete element numerical simulation method have been created to investigate characteristics of fault-related fracture development and distribution *** addition,we compared the modeling results to the measurement of fractures from the outcrop of a strike-slip fault in the Northern Tarim Basin to verify their *** results show that the stress environment is stable in the simple strike-slip section,and fractures intersecting with the strike-slip direction at a small angle are the principal *** the releasing stepover and double-bend sections,the maximum principal stress changes from horizontal to vertical during the formation of pull-apart zones,where the principal fractures intersect the strike-slip direction at a large *** maximum principal stress in the restraining stepover and double-bend section remains horizontal,but their strikes change significantly with the increment of fault ***,fractures intersecting the strike-slip direction at a small angle will become principal fractures early on,while those parallel to or anti-intersecting the strike-slip direction at a small angle will become principal fractures *** are obvious differences in the development of fractures in different structural positions of strike-slip *** are mainly concentrated in the fault tips,connections,and fault plane,and the magnitude of the fault damage zone is relatively larger in the first *** with fault displacement,the principal damage zone(PDZ)shows stronger control on the distribution and development intensity of *** the in

关键词： Strike-slip fault Fault-related fracture Stepover double-bend Discrete element method

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