库车坳陷中秋—东秋段煤层厚度对煤构造变形的离散元数值模拟分析OACHSSCD

The Zhongqiu-Dongqiu area in the Kuqa Depression is located in the structural compression transition zone.Along the strike direction,the structural deformation varies significantly.The Mesozoic-Cenozoic strata are widely developed with the Jurassic-Triassic coal-bearing strata.The coal-bearing strata in the Dongqiu section are thinner than those in the Zhongqiu section.Yet deep fault system,structural style and deformation mechanism in the Qiulitag structural belt are poorly understood.This paper conducts a detailed interpretation of the coal structural deformation styles in the Zhongqiu-Dongqiu section based on the latest 3D seismic data,compares the differential deformation characteristics of the coal structures in the eastern section,and analyzes the factors influencing the coal structural deformation.The results show:the thickness of the coal seam controls the deformation mode of the structure,thin coal seams develop multiple thrust faults,with base-involved deformation as the main type,thick coal seams have strong sliding effect,and the internal wrinkle deformation of the coal seam occurs;in the central and eastern part of the Qiulitag structural belt,the deep coal seam serves as the main sliding layer.During the structural compression process,the structural style is characterized by layer disintegration and detachment sliding,vertical stacking and thickening,and overall coordinated deformation.