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Volume 35 Issue 3
Jun 2024
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Zheng Li, Kai Wang, Xiong Xiong, Bing Zhou. Convex-up Style of Deformation within Grabens in Regions of Incomplete Crossing Conjugate Normal Faults: A Numerical Simulation Investigation and Case Study. Journal of Earth Science, 2024, 35(3): 839-849. doi: 10.1007/s12583-022-1709-y
Citation: Zheng Li, Kai Wang, Xiong Xiong, Bing Zhou. Convex-up Style of Deformation within Grabens in Regions of Incomplete Crossing Conjugate Normal Faults: A Numerical Simulation Investigation and Case Study. Journal of Earth Science, 2024, 35(3): 839-849. doi: 10.1007/s12583-022-1709-y

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

doi: 10.1007/s12583-022-1709-y
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  • Corresponding author: Zheng Li, cugegglz@cug.edu.cn
  • Received Date: 07 Mar 2022
  • Accepted Date: 05 Jul 2022
  • Issue Publish Date: 30 Jun 2024
  • 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.

     

  • Conflict of Interest
    The authors declare that they have no conflict of interest.
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