【摘要】 通过研究渤海湾盆地黄河口凹陷沙河街组沙三下亚段岩芯岩性、沉积结构、构造特征以及测井曲线特征和地震反射特征,认为研究区含油砂岩体为半深湖—深湖环境形成的滑塌浊积扇,可分为内扇、中扇和外扇3个亚相。内扇主要由滑塌堆积和碎屑流沉积组成,中扇主要由碎屑流和浊流沉积组成,外扇主要由浊流沉积组成。结合区域地质背景,探讨了滑塌浊积扇的形成机理和主控因素。浊积扇砂岩体往往被形成于深湖—半深湖相还原环境的深灰色、灰黑色泥岩包围,易形成岩性圈闭,有利于油气的运移和聚集成藏,是断陷湖盆陡坡带油气勘探的重要目标。更多还原

【Abstract】 By studying the lithology,sedimentary texture,structural attitude,logging curve features and seismicreflectance signature in Member 3 of Shahejie Formation in Huanghekou Sag,Bohai Bay Basin,we found thatthe oil-bearing sand bodies in the study area belong to slump turbidite fan deposition formed the under semideeplake and deep lake environment. Slump turbidite fan facies include inner fan,middle fan and outer fan subfacies.The inner fan is mainly composed of slumping sediments and debris flow. The middle fan is dominated by debrisflow and turbidity flow sediments. The outer fan is mainly composed of turbidity flow sediments. Based on theregional geology background,the formation mechanism and the main controlling factors of the slump turbidite fanare discussed in the paper. This kind of fan is usually surrounded by dark grey and dark mudstones formed underreduction environment of the deep lake and semideep lake,and they are more easily to form the lithologic trap. Sothe slump turbidite fan is advantageous for oil-gas migration and accumulation and is also important target of oil andgas exploration in the steep slope belt of the faulted lake basin.更多还原