川西洛带气田遂宁组沉积相及与储集物性关系

川西洛带气田上侏罗统遂宁组主要为三角洲前缘斜坡亚相和浅湖亚相沉积,并可进一步识别出水下分流河道、河口砂坝、远砂坝、席状砂、分流间湾和浅湖砂坝微相,其物源区为龙门山隆起区.砂体的展布明显受控于沉积微相,大多数含气和产气层均处于浅湖砂坝、河口砂坝、水下分支河道及远砂坝等有利沉积微相较厚的砂体分布范围内.沉积微相与储层物性间的配置关系较好,浅湖砂坝与河口砂坝微相储层具有最优的储集条件.因此,寻找有利沉积微相内的优质储集砂体应为洛带气田今后的主要勘探方向.

The relation between sedimentary facies and reservoir physical property of the Upper Jurassic Suining Formation in Luodai Fields of West Sichuan Basin, China

Delta-front acclivity and shallow lake are major types of sedimentary subfacies in the Upper Jurassic Suining Formation,and the provenance is the uplifted area of Longmenshan.There are recognised the following microfaices: underwater distributary channel,distal sandbar,sheet sand,distributary bay and shallow lake sandbar.The sandbody distribution is controlled by sedimentary microfacies.Most of gas-bearing and gas-producing formations are located in favorable sedimentary microfacies,such as shallow lake sandbar,river mouth bar,underwater distributary channel and distal sandbar with thick sandbodies.These sedimentary microfacies and reservoir capacity match very well,and shallow lake sandbar and river mouth sandbar have optimal reservoir capacity.The further exploration of natural gas should be to look for sandbodies of high quality located at favorable sedimentary micorfacies