Convex-up Style of Deformation within Grabens in Regions of Incomplete Crossing Conjugate Normal Faults: A Numerical Simulation Investigation and Case Study  

作　　者：Zheng Li Kai Wang Xiong Xiong Bing Zhou 

机构地区：[1]School of Geophysics and Geomatics,China University of Geosciences,Wuhan 430074,China [2]State Key Laboratory of Geodesy and Earth’s Dynamics,Innovation Academy for Precision Measurement Science and Technology,Chinese Academy of Sciences,Wuhan 430077,China [3]Department of Earth Sicences,Khalifa University,Abu Dhabi,United Arab Emirates

出　　处：《Journal of Earth Science》2024年第3期839-849,共11页地球科学学刊（英文版）

基　　金：supported by the National Key Research and Development Program of China(No.2022YFF0800703);the National Natural Science Foundation of China(No.42230309).

摘　　要：Crossing conjugate normal faults(CCNFs)are extensively developed in many hydrocarbon-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 series 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 deformation 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 influence of the non-conjugate zone on the conjugate relay zone,which varies with the amount of horizontal 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.

关 键 词：incomplete conjugate normal fault conjugate graben convex-up deformation hydrocarbons Nanpu Sag tectonics. 

分 类 号：P54[天文地球—构造地质学]