地质科学2026，Vol.61Issue(2)：440-453,14.DOI:10.12017/dzkx.2026.030
扬子地块西缘海相深层大型台缘带发育与勘探潜力
Development and exploration potential of large-scale carbonate platform-margin belts along the western margin of the Yangtze block
摘要
Abstract
The western margin of the Yangtze block serves as a crucial hydrocarbon exploration zone,characterized by multiple large-scale platform margin belts developed from the Sinian to Permian systems,exhibiting superior geological conditions for forming high-abundance medium to large gas fields.To systematically investigate the sedimentary framework and developmental mechanisms of these multi-phase platform margins,this study comprehensively integrates seismic data from the 3D seismic survey,outcrop profiles,and newly drilled wells in western Sichuan area.The research focuses on analyzing the ocean-continent transition process and platform margin evolution patterns from the Sinian to Permian periods,with particular emphasis on gas enrichment laws and controlling factors.Key findings include:1)identification of four superimposed platform margin belts in the Sinian Dengying formation(Dengying Group),Devonian,and Permian Qixia and Maokou formations.The Sinian Dengying platform margins were controlled by intracontinental rifting related to back-arc extension,with two-phase development closely linked to prolonged extension and intermittent exposure.Devonian platform margins were influenced by Paleo-Tethys Ocean expansion,characterized by high-energy facies deposition controlled by syn-depositional fault shoulders in passive continental margins,while Permian Qixia-Maokou high-energy facies show clear inheritance from Devonian counterparts.2)The Dengying platform margins exhibit dual-source hydrocarbon supply from the Qiongzhusi and Doushantuo formations,with Devonian-Permian systems demonstrating a lower-generation-upper-storage reservoir formation model.Indosinian thrust faults and strike-slip faults serve as primary hydrocarbon migration channels,establishing a three-dimensional reservoir formation model featuring"proximity to hydrocarbon source centers,multi-layer enrichment,dynamic adjustment,and vertical accumulation".3)Comprehensive evaluation reveals optimal source-reservoir-cap configurations in these large-scale platform margins,with predicted geological resources approaching 2 trillion cubic meters and significant exploration potential.This study systematically elucidates the developmental processes and formation mechanisms of multi-phase platform margins,providing crucial insights for exploring new frontiers in deep hydrocarbon exploration in the western Yangtze block.关键词
扬子地块西缘/四川盆地/震旦系/泥盆系/二叠系/高能相带/油气成藏/勘探潜力Key words
Western margin of the Yangtze block/Sichuan Basin/Sinian/Devonian/Permian/High-energy facies zone/Hydrocarbon accumulation/Exploration potential分类
天文与地球科学引用本文复制引用
张殿伟,马健飞,周雁,李开运,张磊,李双建,高山林,刘天甲,罗开平,黄仁春,段南,刘松楠..扬子地块西缘海相深层大型台缘带发育与勘探潜力[J].地质科学,2026,61(2):440-453,14.基金项目
国家自然科学基金企业创新发展联合基金项目(编号:U24B6001)和中国石油化工股份有限公司科技部项目"四川盆地重点层系突破方向与目标优选(Ⅰ期)"(编号:P24156)资助 （编号:U24B6001）
