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沙河街组是沾化凹陷东部五号桩—长堤地区重要的储油层系 ,主要目的层段为沙三段和沙二段。沙三段和沙二段主要发育有浊积扇、水下冲积扇和滩坝沉积体系 ,在浊积扇、水下冲积扇中发育辫状水道、扇中前缘、辫状水道间以及扇根、扇缘等沉积微相类型 ,其中辫状水道、扇中前缘砂体物性好 ,原生孔隙及次生孔隙均较发育 ,辫状水道间以及扇根砂体物性较差。其储集特征主要受岩性、沉积微相、成岩作用等因素控制 ,结合该地区实际情况 ,将沙二段、沙三段储集层划分为好、中、差 3种类型。图 4表 1参 7
Shahejie Formation is an important reservoir system in the Fifth Pillar - Changdi area in the eastern part of Zhanhua Depression. The main target intervals are Sha 3 and Sha 2. Turbidites, subaqueous alluvial fans and beach-barrage sedimentary systems are mainly developed in Es3 and Es2. Braided channels, fan-in front, braided channels and fan bases are developed in turbidite fans and subaerial alluvial fans , Fan margin and other sedimentary microfacies types. Among them, the braided channel and fan foreland sand body have good physical properties, both primary and secondary pores are well developed, and the properties of braided channels and fan-sand bodies are poor. The reservoir characteristics are mainly controlled by lithology, sedimentary microfacies, diagenesis and other factors. According to the actual situation in the region, the reservoir of Es2 and Es3 is divided into three types, ie good, medium and poor. Figure 4 Table 1 Reference 7