古地理学报2025，Vol.27Issue(5)：1207-1226,20.DOI:10.7605/gdlxb.2025.076
松辽盆地扶新隆起带南部扶余油层浅水曲流河三角洲沉积与演化特征
Sedimentary characteristics and evolution of shallow-water meandering river delta in Fuyu oil layer,southern Fuxin uplift zone,Songliao Basin
摘要
Abstract
The southern Fuxin Uplift Belt in the Songliao Basin hosts a shallow-water meandering river delta sedimentary system within the Fuyu oil layer,holding significant hydrocarbon exploration potential.This study establishes a high-resolution sequence stratigraphic framework for the Fuyu oil layer through integrated application of INPEFA technique and chromaticity indices,integrated with core descriptions,well logs,and petrological analyses.Sedimentary facies types were identified through petrological characteristics,sandbody genetic sequences,and well-log facies,enabling systematic analysis of spatiotemporal evolution patterns of deltaic sandbodies within the sequence framework.Results indicate that the Fuyu oil layer formed during a transgressive background with high-frequency base-level fluctuations,comprising four fourth-order sequences(medium-term cycles MSC1-MSC4)and 13 fifth-order sequences(short-term cycles SSC1-SSC13).SSC1-SSC6 exhibited regressive tendencies with high-frequency base-level oscillations,during which delta plain distributary channels evolved from high-sinuosity narrow ribbons to stable anastomosing networks,forming multi-phase vertically stacked channel complexes.SSC7-SSC12 transitioned to transgressive dominance,with delta plains gradually transforming into delta outer front environments where subaqueous distributary channels exhibited lateral accretion and isolated thin ribbons,accompanied by well-developed mouth bars.SSC13 returned to regression,characterized by continuously distributed subaqueous distributary channels and sheet sands.The study reveals that high-frequency base-level fluctuations controlled vertical evolution and planar distribution of shallow-water delta sandbodies.Multi-phase stacking of channel sandbodies driven by base-level oscillations,together with the high continuity and spatial connectivity of distributary channels,jointly governed the formation of thick,sand-rich reservoirs.This research provides novel geological insights for predicting hydrocarbon reservoirs in shallow-water meandering river deltas,offering practical guidance for exploration and development of the Fuyu oil layer in the Songliao Basin.关键词
浅水曲流河三角洲/沉积特征/沉积演化/层序地层/扶余油层/松辽盆地Key words
shallow meandering river delta/sedimentary characteristics/sedimentary evolution/sequence stratigraphy/Fuyu oil layer/Songliao Basin分类
天文与地球科学引用本文复制引用
崔映坤,鲍志东,李忠诚,赵家宏,姜福杰,王天煦,韩昊天,姜振昌,王腾宇..松辽盆地扶新隆起带南部扶余油层浅水曲流河三角洲沉积与演化特征[J].古地理学报,2025,27(5):1207-1226,20.基金项目
中国石油天然气股份有限公司吉林油田分公司(勘探开发研究院)项目(编号:JLYT-YJY-2022-FW-074)资助.[Financially sup-ported by PetroChina Jilin Oilfield Branch(Exploration and Development Research Institute)Project(No.JLYT-YJY-2022-FW-074)] （勘探开发研究院）
