地质科技通报2025，Vol.44Issue(2)：285-304,20.DOI:10.19509/j.cnki.dzkq.tb20230518
浅水扇三角洲沉积特征及演化规律:以准噶尔盆地玛东斜坡区百口泉组为例
Sedimentary characteristics and evolution of the shallow-water fan delta:A case study of the Baikouquan Formation in the Madong slope area,Junggar Basin
摘要
Abstract
[Objective]Conglomerates are unique petroleum reservoirs,and understanding their sedimentary origin and evolution is crucial for accurately predicting the distribution of high-quality reservoirs.[Methods]Based on core logging,petrologic identification,heavy mineral and grain size analysis,and well logging data,the sedimentary characteristics,spatial distribution,and sedimentary provenance of the Lower Triassic Baikouquan Formation conglomerate in the Madong slope area are defined.Meanwhile,the sedimentary mechanism of the formation is clarified,and a sedimentary model is established.[Results]The Baikouquan Formation was deposited as a shallow-water fan delta,and the fan body consists of three subfacies:the fan delta plain,fan delta front,and pro-fan delta,and can be divided into nine microfacies:debris flow,braided channel,flood deposit,subaqueous debris flow,subaqueous main channel,subaqueous branch channel,sandy clastic flow,far sand bar,and pro-fan delta mudstone deposits.Summarily,it contains 10 lithofacies types.The conglomerate was a sedimentary product of flood-induced gravity flow,reflecting complex lithofacies associations,significant evidence of event deposition,a sedimentary model dominated by paleoclimate,and a clear transformation of lake waves.Spatially,the grain size of the Baikouquan Formation conglomerate in the Madong slope region becomes finer from bottom to top,indicating a sedimentary sequence of lake transgression and a multi-period superposition of debris flows,underwater debris flows,and subaqueous channel deposits.关键词
砾岩成因/扇三角洲/洪水成因重力流/百口泉组/准噶尔盆地/玛东斜坡区Key words
genesis of conglomerate/fan delta/flood-induced gravity flow/Junggar Basin/Madong slope area/Baikouquan Formation分类
天文与地球科学引用本文复制引用
代超,康逊,谭静强,鲁锋,连丽霞,胡瑞璞..浅水扇三角洲沉积特征及演化规律:以准噶尔盆地玛东斜坡区百口泉组为例[J].地质科技通报,2025,44(2):285-304,20.基金项目
国家自然科学基金项目(42272179) （42272179）
