尚店油田东营组三角洲砂体沉积特征

湖泊三角洲沉积是在河流与湖泊共同作用下形成的，与河流入海形成的三角洲有一定的相似性，主要为河控三角洲。尚店油田东营组属湖泊三角洲，它除了具有河控三角洲的沉积特征以外，而且还具有其特殊性，发育了滨岸坝、湖滩砂。这两种类型沉积砂体在已有的典型湖成三角洲砂体模式中很少提及。研究了区域沉积环境及沉积特征，认为东营组早期为河控沉积为主，逐渐演变为浪控沉积为主，即由建设性三角洲逐渐变为破坏性三角洲；滨岸坝、湖滩砂仍属湖泊三角洲沉积，它丰富了湖成三角洲沉积相类型。

Sedimentary features of delta sand bodies in Dongying Formation of Shangdian oilfield

Lacustrine delta sedimentary facies, which is generally formed under the effect of river and lake together, is mainly river -controlled delta. Dongying Formation in Shangdian oilfield belongs to lacustrine delta; it is characterized not only with the sedimentary features of river - controlled delta but also the particularity of developed shoreland bar and beach sand. These 2 types of depositional sand bodies are rarely seen in typical depositional modes of lacustrine delta sand bodies. This paper established regional sedimentary environment and characteristics. In terms of origin, it is suggested that Dongying Formation is dominated by river-controlled deposition at early stage and then gradually dominated by wave-controlled deposition, correspondingly changing from a constructive delta into a destructive delta. The shoreland bar and beach sand are classified into lacustrine delta deposition and they can be added to the types of lacustrine delta sedimentary facies.