Physical Simulation Experiment on Stratification Strike-slip Fault Deformation Mechanism in the Tazhong Uplift

doi:10.19657/j.geoscience.1000-8527.2022.203

Abstract

Abstract:

The Tazhong uplift, located in the middle of the central uplift belt of Tarim basin, is a key block for oil and gas exploration. Strike-slip faults are well developed in Ordovician carbonate rocks at Tazhong, and the role of reservoir control is obvious. The study on the strike-slip faulting mechanism is very important for oil and gas exploration and development. Strike-slip faults in the Tazhong uplift are featured by typical delamination. To clarify the main controlling factors of delamination mechanism of these strike-slip faults, four groups of physical simulation experimental models were designed. The experimental results show that the formation of strike-slip fault delamination characteristics is mainly related to vertical stratigraphic property changes (delamination) and multi-stage activities (stages). Delamination and staging could form the delamination characteristics of these strike-slip faults. The delamination differential deformation characteristics of the Tazhong strike-slip faults may have caused by the different vertical stratigraphic lithology and multi-stage tectonic activity.

Key words: strike-slip faults, delamination deformation, multiperiodic activity, structural-physical simulation, Tarim Basin

CLC Number:

TE121.2

PENG Zijun, FENG Lei, LUO Caiming, CHEN Shi, SONG Xingguo, LIANG Xinxin, ZHOU Xiaorong. Physical Simulation Experiment on Stratification Strike-slip Fault Deformation Mechanism in the Tazhong Uplift[J]. Geoscience, 2022, 36(04): 1022-1034.

Figures/Tables 13

Fig.1 Structural units of the Tarim basin (Tarim Oilfield Company, 2019)

Table 1 Paleozoic strata in the Tazhong area (after ref. [13])

Fig.2 Seismic interpretation section of the Tazhong uplift T2836

Fig.3 Three-layered strike-slip fault structural model in the Tazhong uplift

Fig.4 Seismic interpretation for the Zhonggu 30 and Zhonggu 262 faults

Table 2 Experimental design scheme and the related parameters

Fig.5 Experimental model diagram

Fig.6 Strike-slip fracture stratified stage experiment process and results

Fig.7 Strike-slip fault hierarchical single-phase experiment process and results

Fig.8 Strike-slip fracture single-layer multiphase experiment process and results

Fig.9 Single-phase strike-slip experimental process and results

Fig.10 Comparison of planar characteristics

Fig.11 Comparison of experimental profile characteristics with the actual profile

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