东营凹陷北部陡坡带西段水下扇体储集层特征

东营凹陷北部陡坡带发育多种类型的砂砾岩扇体，近年来一直是寻找隐蔽性油气藏的有利地区。其西段古近纪沙河街期四段时期形成以砂岩、砾岩为主的近岸水下扇沉积体。储集层岩石结构成熟度和成分成熟度均较低，多为双模态和复模态结构。本文首先从宏观上对储集层的岩石类型、沉积特征和平面分布进行描述，再从微观上对影响储集层物性的主要成岩作用进行描述，分析该砂砾岩体储集层的孔隙类型和孔隙结构特征。最后，对储层进行综合评价，认为该类储集层孔隙类型多样，孔隙结构复杂，为中低孔隙度、低渗透率储层类型。

The reservoir rocks of the subaqueous fans in the western segment of the steep slope zone of northern Dongying depression, Shandong

A variety of sandstone and conglomerate fans occur along the steep slope zone of northern Dongying depression, Shandong, a prospective area for the concealed oil and gas pools. These sandstone- and conglomerate-dominated nearshore fans were formed during the deposition of the fourth member of the Paleogene Shahejie Formation in the western segment of the slope zone. The reservoir rocks have lower textural maturity and compositional maturity and display bimodal or polymodal structures. The study of the porosity types and structures of the sandstone and conglomerate reservoirs on the basis of rock type, deposition, planar distribution and diagenesis shows that the reservoir rocks in the study area have moderate to low porosity and low permeability.