摘要
Through studying the formation mechanism,the main control factors,the lithology,logging curve features and seismic reflectance signature in the lower Member 3 of Shahejie Formation in Huanghekou Sag,it was found that the oil-bearing sand bodies in the Area A belonged to two kinds of sublacustrine fan deposition formed under semi-deep-lake to deep-lake environment.Deposition of the deep-water turbidite sublacustrine fan corresponded to low stand system tract;deposition of the slump turbidite sublacustrine fan corresponded to transgressive system tract and high stand system tract,which was formed by slumping delta front sand.As a matter of fact,different tectonic background,lake level changes and provenance could result in different position,shape and size of sublacustrine fan.