济阳坳陷青东凹陷新近系沙河街组沉积体系研究

Depositional systems of the Neogene Shahejie Formation in the Qingdong depression

新近系沙河街组是青东凹陷区块油气勘探的主要目的层位,但目前并没有研究者对其中有利沉积相带及沉积体系有过系统的研究,这极大制约了进一步的油气勘探开发。本文以沉积学、地层学理论为指导,依据岩芯、录井、测井及地震等资料,运用沉积学、古生物学、地球化学以及地球物理学的沉积相标志,在青东凹陷区块新近系沙河街组地层内划分出三角洲体系和湖泊体系两类沉积体系,并进一步划分出了扇三角洲、三角洲、滩坝、近岸水下扇、湖底扇、湖泊等6个沉积相及相对应的亚相和微相,为青东凹陷地区有利储层的预测以及进一步的油气开发提供了重要依据。

The Neogene Shahejie Formation is interpreted as the important target horizons for the hydrocarbon exploration in the Qingdong depression.Two depositional systems are distinguished for the Formation in the light of cores,well logs and seismic data,and six sedimentary facies are discriminated,including the fan delta,delta,beach bar,nearshore submarine fan,sublacustrine fan and lake facies.The results of research on the types and characteristics of the sedimentary facies in this study may provide an important basis for the prediction of the favourable hydrocarbon reservoirs and hydrocarbon exploration and development in the Qingdong depression in the future.