石油与天然气地质2026，Vol.47Issue(1)：96-107,12.DOI:10.11743/ogg20260107
川东地区多滑脱层系控制下的构造样式差异及其对石炭系油气勘探的启示
Structural style differences under the control of multiple detachment layers and their implications for the Carboniferous hydrocarbon exploration in the eastern Sichuan Basin
摘要
Abstract
The Carboniferous reservoirs in the eastern Sichuan Basin are generally thin,rendering the exploration of stratigraphic-lithologic hydrocarbon accumulations therein more challenging.Therefore,there is an urgent need to determine the coupling relationship between the distribution of detachment layers and regional structural styles,aiming to provide a novel philosophy for the structural trap exploration.Using seismic reflection data,drilling and log data,and the research results of regional geology,we analyze the controlling effects of detachment layers on structural styles in the eastern Sichuan Basin from the perspective of structural geometry.Furthermore,the formation process of the Carboniferous traps under the layered structural deformation pattern is investigated in depth.The research results reveal that the Dachigan-Datianchi area in the eastern Sichuan Basin exhibits thin Triassic but thick Silurian and Cambrian detachment layers.The deformation exhibits distinct stratification bounded by the Silurian:below it,east-dipping reverse faults and folds occur,while fault-propagation folds dominate above.Under this layered deformation system,fault-propagation folds overlying the Silurian strata exhibit steeply dipping faults at the base of their forelimbs,while their gently dipping faults extend forward along detachment layers.These faults jointly control the formation of the Carboniferous faulted anticline traps.Across the eastern Sichuan Basin,the differential distribution of detachment layers is coupled with structural styles.Notably,the Carboniferous traps associated with fault-propagation folds within the layered deformation system of the Dachigan-Datianchi tectonic zone serve as key potential targets for hydrocarbon exploration in the region.关键词
断层相关褶皱/滑脱层/构造样式/石炭系/川东地区Key words
fault-related fold/detachment layer/structural style/Carboniferous/eastern Sichuan Basin分类
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陈友智,王兰英,陈娜,陈颖,冯许魁,朱亚东,师政,肖东,陶俊,郭海洋,周跃宗,王征..川东地区多滑脱层系控制下的构造样式差异及其对石炭系油气勘探的启示[J].石油与天然气地质,2026,47(1):96-107,12.基金项目
中国石油东方地球物理公司油气勘探新领域综合研究项目 （）
贵州省基础研究计划项目(黔科合基础-ZK[2024]一般513) （黔科合基础-ZK[2024]一般513）
贵州理工学院高层次人才引进项目(2023GCC081). （2023GCC081）
