东北石油大学学报2026，Vol.50Issue(1)：47-62,16.DOI:10.3969/j.issn.2095-4107.2026.01.004
浅水曲流河三角洲前缘沉积特征及模式
Sedimentary characteristics and models of shallow water meandering river delta front:a case study of Pen-glaizhen Formation in Baimamiao Area,West Sichuan Depression
摘要
Abstract
Based on data from cores,thin sections,logging-while-drilling,and 3D seismic surveys,this study analyzes the sedimentary characteristics,distribution,and models of the shallow delta front subfa-cies of the Penglaizhen Formation in the Baimamiao Area.The results indicate that the region is pre-dominantly composed of fine-grained sediments,with locally identifiable gravel-sized clastics,catego-rized into three lithofacies:conglomerate,sandstone,and mudstone.The flat terrain,arid and hot cli-mate,and the developmental features of sand bodies characterized by"thin-layer stacking and multi-phase superposition"are noted.Storm deposits identified in cores suggest shallow delta front sedimenta-tion during the Penglaizhen Formation period,influenced by storm disturbances.From Peng 3 to Peng 4 members primarily developed microfacies such as subaqueous distributary channels,mouth bars,and sheet sands.Mouth bars often appear as remnants,frequently overlaid by subaqueous distributary chan-nels,while sheet sand bodies are widely distributed,forming a shallow delta front sedimentation with a striped-branching network pattern in plan view.The sedimentary model is primarily controlled by fre-quent lake-level fluctuations and fluvial-littoral reworking,exhibiting an evolutionary pattern from pro-gradational to aggradational-progradational.These findings provide references for understanding sedi-mentary facies in the Baimamiao Area,as well as exploration and development in the Penglaizhen For-mation of Western Sichuan and similar regions.关键词
浅水三角洲/曲流河/沉积特征/沉积模式/风暴沉积/蓬莱镇组/白马庙地区/川西坳陷Key words
shallow-water delta/meandering river/sedimentary characteristics/sedimentary model/storm deposite/Penglaizhen Formation/Baimamiao Area/West Sichuan Basin分类
能源科技引用本文复制引用
孙志昀,卜梓伟,罗龙,谭先锋,汤潇,刘柏,李萌,何仕鹏,黄嵌,谢诗意,刘梦,杨政林..浅水曲流河三角洲前缘沉积特征及模式[J].东北石油大学学报,2026,50(1):47-62,16.基金项目
国家自然科学基金青年科学基金项目(42102133) （42102133）
