Development characteristics and geometric pattern analysis of compression-torsion fault zone in the Wuxia area of Junggar Basin
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TE121.2

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    Abstract:

    The geometric characteristics of compression-torsion faults and their evolutionary laws are complex and need to be further understood,which is of great practical significance for oil and gas exploration in western compression-torsion basins. It is revealed by the field outcrop exploration and high-density 3D seismic data process result that the high-angle thrust faults are characterized by notable strike slip accompanied by multiple series of secondary shear faults,forming a typical compression-torsion fault zone in Wuxia area in the northwestern margin of Junggar Basin. The competence difference of clastic rocks controls the vertical decoupling propagation and segmented development of the compression-torsion fault.The intensity of tectonic activity controls the fault development series and geometric patterns. The profile geometric patterns of compression-torsion faults are identified in“braided”,“flower”,and“step”shapes,corresponding to the plane distribution patterns of“network”,“plume”,and“echelon”from deep to shallow layers with the gradual decline in intensity.The discovered oil and gas reservoirs cast light on the significant differences in vertical oil and gas transmission capacity of compression-torsion faults with different geometric patterns,which is a controlling factor for the spatial distribution of oil and gas resources in the compression-shear basin.

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WANG Jianwei, LIAO Wei, ZENG Zhiping, ZHAO Leqiang, CAO Jianjun, GUO Ruichao, ZHOU Jian, MA Ji. Development characteristics and geometric pattern analysis of compression-torsion fault zone in the Wuxia area of Junggar Basin[J]. Petroleum Geology and Recovery Efficiency,2020,27(6):1~10

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  • Online: December 24,2020
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