石油与天然气地质2026，Vol.47Issue(2)：490-504,15.DOI:10.11743/ogg20260209
四川盆地德阳-安岳裂陷槽两侧灯影组台缘带结构特征和沉积相模式
Structural architecture and sedimentary facies models of the Dengying Formation platform margin belts along the flanks of the Deyang-Anyue rift trough,Sichuan Basin
摘要
Abstract
The platform margin belts of the Dengying Formation flanking the Deyang-Anyue rift trough represent a critical frontier for natural gas exploration and development in the Sichuan Basin.While giant gas fields,such as Anyue and Penglai,have been discovered along the eastern margin,the sedimentary characteristics of the western margin and the architectural disparities between the two flanks remain poorly understood,thereby constraining further exploration efforts in the region.By integrating core descriptions,well logs,and 3D seismic data,we systematically characterize the development of the Dengying Formation platform margins on both sides of the trough.Lithofacies paleogeographic maps were reconstructed for key intervals,and refined sedimentary facies models were established for the dual-flank system.As indicated by the research results(1)During the Late Sinian deposition of the Dengying Formation,the platform margins on both flanks primarily consisted of microbial mound,shoal,and mound-shoal complex facies,along with inter-mound/shoal subfacies,whereas the trough interior was dominated by slope-to-basin facies.(2)Distinct heterogeneities exist in the development and evolution of the platform margins.The eastern margin,controlled by basement faults,exhibits a steeply dipping,vertically stacked architecture with minimal lateral migration.In contrast,the western margin is characterized by multi-stage,gently sloping geometries with significant lateral migration distances.(3)Lithofacies paleogeographic mapping reveals substantial spatial variations in platform margin distribution between the second(Deng 2)and fourth(Deng 4)members of the Dengying Formation.During the Deng-2 period,the platform margin followed a quasi-circular distribution along the Chengdu-Suining-Zizhong trend.During the Deng-4 period,the platform margins expanded significantly,with the western margin trending NS along the Hongya-Jingyan-Zigong area and the eastern margin extending NS along the YantingSuining-Moxi area.Overall,the Deyang-Anyue rift trough is characterized by a"steep-east vs.gentle-west"and"single-stage-east vs.multi-stage-west"sedimentary facies model.关键词
岩相古地理/沉积相模式/灯影组/台缘带/德阳-安岳裂陷槽/四川盆地Key words
lithofacies paleogeography/sedimentary facies model/Dengying Formation/platform margin belt/Deyang-Anyue rift trough/Sichuan Basin分类
能源科技引用本文复制引用
文龙,胡明毅,罗冰,张本健,杨宏宇,周刚,刘艺妮,王文芝..四川盆地德阳-安岳裂陷槽两侧灯影组台缘带结构特征和沉积相模式[J].石油与天然气地质,2026,47(2):490-504,15.基金项目
国家科技重大专项(2025ZD1400402) （2025ZD1400402）
国家自然科学基金项目(42072171) （42072171）
中国石油西南油气田分公司揭榜挂帅项目(XNSJS2022-180). （XNSJS2022-180）
