Controlling Factors and Physical Simulation Experiments on Formation and Evolution of Conjugate Strike-Slip Faults

doi:10.7657/XJPG20230106

Abstract

Abstract:

The origins of X-shaped conjugate strike-slip faults are complex. Considering the geological conditions of large X-shaped conjugate strike-slip faults in the Tabei area of the Tarim basin，7 sets of sandbox experiments with different parameters were designed to explore the controlling factors and evolution process of the X-shaped conjugate strike-slip faults. The experimental results show that conjugate strike-slip faults tends to be formed in the model with large thickness，large width and high clay content under the rapid compression on both sides. In the experiment，the fault tail propagation and the dominant development of a group of faults are obvious，while the fault linkage growth and the localization of overlapping area are weak. The formation of conjugate strike-slip faults requires three conditions: certain caprock thickness，and lack of pre-existing faults; good physical homogeneity of rocks，certain viscoplasticity，and high movement rate; and two-way compression. In the natural world and experiments，symmetrical pure shear conjugate strike-slip faults can hardly be formed，but most faults are single-shear strike-slip faults that develop as a group in dominant direction. In the Tarim basin，the conjugate strike-slip faults are also asymmetric，and they are dominantly single-shear faults in NW-SE direction; the inherited development with small displacements is the main controlling factor for the formation of large-scale conjugate strike-slip faults.

Key words: Tarim basin, conjugate strike-slip fault, structural physical simulation, controlling factor, genetic mechanism, evolution model

CLC Number:

TE122.1

DAI Lan, WU Guanghui, CHEN Xin, ZHU Yongfeng, CHEN Siqi, LUO Xin, HU Ming. Controlling Factors and Physical Simulation Experiments on Formation and Evolution of Conjugate Strike-Slip Faults[J]. Xinjiang Petroleum Geology, 2023, 44(1): 43-50.

Figures/Tables 8

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