Structural and Model Analysis of the Multi-period Structural Superimposed in Fangzheng Fault Depression

doi:10.11885/j.issn.1674-5086.2019.03.02.01

Abstract

Abstract: In order to clarify the basin deformation caused by multi-period tectonic overlap in Fangzheng Fault Depression, the complex structural styles in the fault depression and the problems of multi-solution in structural analysis, we combine the analysis of seismic data, regional tectonic characteristics and Tanlu Fault evolution with the analysis of extensional, strike-slip pull-apart, strike-slip compression and later uplift-denudation of Fangzheng Fault Depression. New understanding and methods are put forward for structural analysis, and a three-dimensional stress model of extension-strike-slip-compression in Fangzheng fault depression is established. The study shows that the western part of the fault depression is weakly reformed and inherits the extension model of the Cretaceous basin in the early stage of the fault depression. The compression-nappe reformation in the eastern part of the fault depression is strong in the later stage, and the extension model is no longer applicable. The influence of thrust-nappe structure must be considered. The developed Yihantong Fault has obvious strike-slip characteristics and floral structure. The east and west sides of the Yihantong fault are characterized by asymmetric differential strike-slip fault depression. The strike-slip model is applied to the analysis of both sides of the Yihantong fault. Therefore, the extension model can not be used to analyze the multi-structural superimposed fault basin, but the later transformation model should be considered, and on this basis, a set of structural analysis method for complex faulted basins has been found.

Key words: multiphase structural superimposed, structural analysis, Fangzheng Fault Depression, asymmetric difference strikeslip mechanism

CLC Number:

TE121
P618

WU Jingfeng, MENG Qi'an, FU Xiaofei. Structural and Model Analysis of the Multi-period Structural Superimposed in Fangzheng Fault Depression[J]. 西南石油大学学报(自然科学版), 2020, 42(4): 47-54.

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