Meso-Cenozoic structural deformations and their impacts on hydrocarbon preservation in the western Hubei-eastern Chongqing area
Since hydrocarbon accumulation is closely associated with structures,examining structures and hydrocarbon preservation conditions is significant for hydrocarbon exploration.In this study,we explore the fault characteristics and the differential distribution of structural styles in the western Hubei-eastern Chongqing area and classify the structural units in this area.Furthermore,we describe the types and evolution of faults and other geological structures in this area and analyze their impacts on hydrocarbon preservation.The results reveal that the western portion of the southern structural zone of the middle Yangtze Block in this area has undergone multi-stage basin-orogen couplings since the Mesozoic.This has led to a high intensity of structural deformations and the formation of basement-involved faults and cap rock-detachment faults.A method to assess the hydrocarbon preservation conditions in this structurally complex area is proposed in this study.The assessment results suggest that areas west of the Qiyueshan fault are more favorable compared with those east of it in hydrocarbon preservation.Among others,the Wanxian synclinorium displays the optimal preservation conditions,followed by the Shizhu synclinorium.In the western Hunan-Hubei fold belt,the Lichuan structural belt demonstrates the most favorable conditions for hydrocarbon preservation,succeeded by the Enshi structural belt,with the Nanbei Town-Sangzhi Shimen structural belt exhibiting the least favorable conditions.The findings of this study have proven effective in exploring shale gas,tight gas,and karst reservoirs in the Hongxing and Yi'en areas.
preservation conditionstructural stylecomplex structureMeso-CenozoicHongxing areawestern Hubei-eastern Chongqing area
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