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通过对阜东斜坡区24口探井的侏罗系三工河组岩心的详细观察和描述,将其划分为7个岩相,分别为砾岩相、砂砾岩相、粗砂岩相、中砂岩相、细砂岩相、粉砂岩相及泥岩相。在岩相划分基础上,结合薄片鉴定、测井及录井资料的分析,建立了水下分流河道、水下分流河道间、席状砂和滨浅湖泥4个沉积微相的沉积序列,包括各微相沉积序列的岩相组合特征、曲线形态及层理构造等。据此,完成单井相、连井相及平面相的绘制,实现对阜东斜坡区侏罗系三工河组沉积相研究。研究区主要发育辫状河三角洲前缘亚相沉积,自三一段到三二段再到三三段各沉积微相展布不同,水体显示为水退再水进的过程。而湖岸线的变化不明显,说明在三工河组沉积时期构造较稳定,水体振荡微弱,砂体厚度受控于沉积物的供给,在三二段砂体发育最厚,三一段次之,三三段的沉积物供给量不足,砂体以席状砂为主。沉积作用对阜东斜坡侏罗系三工河组储层物性控制明显。水下分流河道以及席状砂微相水动力条件强,所发育的储集岩分选好,泥质杂基含量低,不仅发育大量的原生孔隙,还常见碳酸盐岩胶结物发育,使得储集岩孔隙受压实作用破坏相对较少,并且碳酸盐胶结物可发生溶蚀,进而保留大量的粒间孔隙。
Through detailed observation and description of the core of the Sangonghe Formation of Jurassic in 24 exploration wells in the Fudeng Slope, it is divided into seven facies, which are conglomerate facies, glutenite facies, coarse sandstone facies, middle sandstone facies , Fine sandstone facies, siltstone facies and mudstone facies. Based on the lithofacies division and the analysis of the identification, logging and logging data, the sedimentary sequences of four sedimentary microfacies of underwater distributary channel, underwater distributary channel, sand sheet and shallow lake mud are established. Including the microfacies sedimentary sequence lithofacies combination features, curve shape and bedding structure. Based on this, the drawing of single-well facies, continuous facies and plane facies is completed, and the sedimentary facies of the Sangonghe Formation of Jurassic in Fudeng Slope is realized. In the study area, the braided river delta front subfacies are mainly developed. The distribution of sedimentary microfacies varies from the third to the third and the third to the third and the third sections. The water body shows the process of water retreat and water re-entry. The change of lakeside line is not obvious, which indicates that the structure of Sangonghe Formation is stable and the water body oscillation is weak. The thickness of sand body is controlled by the supply of sediments. , Three or three sections of the sediment supply is insufficient, sand-based sand-based table. Sedimentation Effect on the Reservoir Property of Jurassic Sangonghe Formation in Fudong Slope. Underwater distributary channels and sand-like sand have strong hydrodynamic conditions. Well-developed reservoir rocks are well sorted and their content of argillaceous is low. Not only are a large number of primary pores developed, but also the development of carbonate cements, making Reservoir pores are less damaged by compaction, and carbonate cements can dissolve, leaving a large amount of intergranular pores.