Segmented Structural Characteristics and Growth Mechanism of Transtensional Strike-Slip Fault Zone in Tazhong Uplift
In the Tarim basin,transpressional strike-slip faults are developed under oblique compression in the Ordovician carbonate rocks,but a series of transtensional strike-slip faults have been discovered in the Tazhong uplift,significantly controlling the hydrocarbon accumu-lation.Using the 3D seismic data from the western Tazhong uplift,as well as the attributes such as coherence and curvature,the kinematic parameters of the strike-slip faults were statistically analyzed.Through structural analysis of the strike-slip faults,the FⅡ21 strike-slip fault zone in the Tazhong uplift was optimally selected for segmented modeling,and its growth mechanism was investigated.The results show that the FⅡ21 strike-slip fault zone is segmented horizontally and stratified vertically.Various structural forms such as linear,en echelon,horsetail,wingtip,braided,and overlapping structures are found at the top of the Ordovician carbonates.The characteristics of altitude dif-ferences of the fault zone reveal segmentation and tail-end expansion as the growth mechanisms,elucidating its role as a transform fault that regulates the reverse contraction deformation on either side of the strike-slip fault zone,and clarifying its evolution process including stages of en echelon fracturing,growth and linkage,and reactivation.
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