首页|Convex-up Style of Deformation within Grabens in Regions of Incomplete Crossing Conjugate Normal Faults: A Numerical Simulation Investigation and Case Study
Convex-up Style of Deformation within Grabens in Regions of Incomplete Crossing Conjugate Normal Faults: A Numerical Simulation Investigation and Case Study
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Crossing conjugate normal faults (CCNFs) are extensively developed in many hydrocar-bon-producing basins, generally existing in the form of incomplete CCNFs. Nevertheless, the effect of the non-conjugate zone of the CCNFs on the conjugate relay zone post late tectonic action has not been previously studied. We use 3D elastic-plastic modeling to investigate the influence of incomplete (i.e., partially intersecting) CCNFs on the pattern of deformation of strata in the intersection region. A se-ries of model simulations were performed to examine the effects of horizontal tectonic extension, fault size, and fault depth on the deformation of conjugate relay zones of incomplete CCNFs. Our analyses yielded the following results. (1) The model of incomplete conjugation predicts a convex-up style of de-formation in the conjugate graben region superimposed on overall subsidence under applied horizontal tectonic extension. (2) The degree of convex-up deformation of the conjugate graben depends on the in-fluence of the non-conjugate zone on the conjugate relay zone, which varies with the amount of hori-zontal tectonic extension, fault size, and fault burial depth. (3) Our results indicate that incomplete CCNFs can form convex-up deformation, similar to that in the Nanpu Sag area and provide a sound understanding of hydrocarbon migration and accumulation.
incomplete conjugate normal faultconjugate grabenconvex-up deformationhydrocarbonsNanpu Sagtectonics
Zheng Li、Kai Wang、Xiong Xiong、Bing Zhou
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School of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China
Department of Earth Sicences, Khalifa University, Abu Dhabi, United Arab Emirates
State Key Laboratory of Geodesy and Earth's Dynamics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430077, China
National Key Research and Development Program of ChinaNational Natural Science Foundation of China
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