埕北地区沙河街组缓坡带沉积体系

Depositional systems in the Shahejie Formation in the ramp zone of the Chengbei region, Bohai Gulf

摘要: 埕北地区古近系沙河街组为以缓坡沉积相带为主的断阶带。在构造、地层、沉积相、物源进行分析的基础上,划分了6个三级层序;在地层等时格架对比和物源区分析的基础上,建立了以碎屑岩缓坡沉积相带为主的沉积体系,确定了缓坡辫状河三角洲、滨浅湖滩坝、浊积扇3种类型的缓坡带有利储集体。

Abstract: The Paleogene Shahejie Formation strata occur in the fault terraces in the ramp facies zone of the Chengbei region Bohai Gulf, and are grouped, on the basis of geological structures, stratigraphy, sedimentary facies and provenance, into six third-order sequences.The correlation of the sequence stratigraphic isochronous framework and provenance analysis result in the establishment of the spatial distribution of clastic ramp-dominated depositional systems and delineament of three types of favourable reservoirs including braided delta, littoral and shallow lake beach and bar, and turbidite fan in the ramp zone.