辽河油田茨79断块沉积相及油气分布

Sedimentary Facies and Oil gas Distribution of Ci 79 Fault Block in Liaohe Oil Field

辽河油田茨７９断块主要含油气层段为沙三１＋２亚段，岩性为浅灰色细砂岩、砾状砂岩和灰绿色、紫红色泥岩的互层，沉积厚度受古地形控制．通过岩心描述和分析并结合沉积层序和砂体展布特征，将该区沉积相解释为河流作用影响的滨浅湖沉积，除了发育障壁砂坝和砂滩砂体外，还受到岸上间歇性或小型河流的影响，但河流作用在该区尚未形成三角洲体系，主要储集砂体类型为湖滨滩坝和水下河道，油气分布受构造和沉积砂体的控制．

the third member of Shahejie formation is the main hydrocarbon reservoir of Ci 79 fault block in Liaohe Oilfield.The deposit consists of light gray fine and gravelly sandstones and the interbeds of greenish gray and purplish red shales.Its thickness is controlled by paleogeography.According to the core description and analysis and the characteristics of sedimentary sequence and sandbody geometries,it is held that the sedimentary facies are shallow lacustrine beach and bar deposits influenced by subaqueous channels.The fluvial process was not strong enough to form a delta system.The oil and gas distribution is controlled by the structure and sedimentary facies.