沉积与特提斯地质2025，Vol.45Issue(2)：424-433,10.DOI:10.19826/j.cnki.1009-3850.2025.02005
川东南綦江地区基底走滑断裂特征及控藏意义
Basement strike-slip faults in the Qijiang area,southeastern Sichuan,and their signficance in reservoir control
摘要
Abstract
Exploration in the Qijiang area of southeastern Sichuan has confirmed that basement strike-slip faults play an important role in the formation of oil and gas reservoirs.This study analyzes their controlling effect based on the interpretation of the latest 3D seismic data.The research identifies three main types of basement strike-slip faults:flower-shaped,single steep,and multiple steep parallel structures.There are mainly four planar combinations:linear,nearly parallel,goose align,and dual sliding structure.The sliding tensile strength of the basement faults and the topographic variations of the Dongwu paleogeomorphological jointly control the development of three karst types:surface karst along the unconformity,Bedding karst strongly related to the fault direction above the aquitard,and fault-related karst in the basement section;These karst features are key to the formation of high-quality carbonate reservoirs in the study area.The basement faults,which were activated and opened during the Dongwu period,connect the upper and lower source rock layers,serving as the main migration pathway for oil and gas in the Maokou Formation.The Lizi-Shilongxia area in the southwestern part of Qijiang region is located within a favorable karst slope zone.Proximity to basement strike-slip faults has facilitated the development of large-scale karst reservoirs.The reactivation of faults during the Dongwu period established connections with source rocks,while the relatively stable caprock conditions make this area a promising target for oil and gas exploration.关键词
綦江地区/走滑断裂/岩溶/油气成藏Key words
Qijiang area/strike-slip fault/karst/hydrocarbon accumulation分类
天文与地球科学引用本文复制引用
刘海涛,石司宇,李让彬..川东南綦江地区基底走滑断裂特征及控藏意义[J].沉积与特提斯地质,2025,45(2):424-433,10.基金项目
国家自然科学基金企业创新发展联合基金项目"海相深层油气富集机理与关键工程技术基础研究(U19B6003) （U19B6003）
中国石化科技部重点科技项目"四川盆地走滑断裂带成因及控藏机制研究"(P20062-3) （P20062-3）
中国石化股份项目"四川盆地及周缘资源评价"(P23221) （P23221）
