濮城油田东西区储层沉积微相

濮城油田东西区沙二段下亚段按T－R沉积旋回划分为8个砂岩组，根据其岩石学特征及沉积构造特征，识别出8种岩石相类型。按其组合及成因特点，储集砂体主要为浅水湖泊三角洲前缘沉积，主要的沉积微相是水下分流河道，河口砂坝，前缘席状砂及远砂坝，沙二段下亚段总体上经历了从湖退到湖进的沉积演化，因此，主要的有利储集砂体位于湖退晚期和湖进的早期，即沙二段下亚段3－6砂岩组。

Sedimentary Microfacies of Reservoir in East and West Regions of Pucheng Oilfield

The lower position of Es 2 in the East and West Regions of Pucheng Oilfield is divided into 8 sand groups based on T-R sedimentary cycles. Eight types of petrologic facies are recognized according to petrological nature and sediment tectonic properties. In combination with the assemblage and genetic features, the reservoir sandbody is a delta frontal deposit in shallow lake, of which the sedimentary facies are subfluvial distributary channel, estuarine sand bar,frontal sheet sand and distant sand bar. The lower position of Es 2 totally undergoes the sedimentary evolution from lake recession to lake progression, thus the main favorable reservoir sandbodies are located at the late stage of lake recession and the early stage of the lake progression, that is the 3~6 sandstone groups in the lower position of Es 2.