辽东湾LD27-2井区东营组有利储层展布研究

Distribution on Favorable Reservoir of Dongying Formation, LD 27-2 Well Block,Liaodong Bay

辽东湾LD27-2井区位于渤海区域辽东湾辽中凹陷南端,利用地质、地震、测井等资料对该地区东营组砂组划分、沉积相特征、储层特征等进行研究。沉积相以三角洲和湖泊相为主,主要发育河口坝、水下分流河道、坝间、分流间湾、远砂坝、滨湖、滨湖砂坪、滨湖泥坪。预测了研究区E3d^(1-3)和E3d^(2u-3)等两套砂体,E3d^(1-3)砂体分布在河口坝沉积微相中,E3d^(2u-3)砂体主要分布在水下分流河道沉积微相中。研究区物性主控因素为沉积环境,其中河口坝和水下分流河道的物性较好,推测为有利储层发育区。

LD27-2 well block is located at the southern end of Liaozhong depression, Liaodong Bay of the Bohai Sea. For the Dongying Formation in this block, the sandstones classification, sedimentary-facies features, and reservoir characteristics were analyzed on the basis of plenty of geological, seismic, and well-logging data.Results show that, with deltaic and lacustrine facies as the soul,there are also some microfacies developed, containing mouth bar,underwater distributary channel, between-the-bar, interdistributary bay, distal bar, shore, and shore sand flat and mud flat; there are two sets of sandstones, including E3d^(1-3) and E3d^(2u-3), the former distributing in mouth bar microfacies whereas the latter in underwater distributary channel; and the main factor affecting physical property is depositional environment. So, it is predicted that both mouth bar and underwater distributary channel with better property are just favorable reservoir distribution areas.