长武地区延长组沉积微相与油气聚集有利相带

The microfacies of Yanchang Formation in Changwu Region and favorable facies belts of hydrocarbon accumulation

根据长武地区延长组的沉积微相特征,建立了8种沉积微相模式。长武地区延长组辫状河三角洲相与湖泊相交替发育,沉积环境由陆上沉积到水下沉积再到陆上沉积,这种沉积演变形成了多套有利的成藏组合,而沉积微相控制了砂体展布与油气的聚集,辫状河道、水下分流河道和河口坝是油气聚集的有利相带。

According to the characteristics of sedimentary microfacies of Yanchang Formation in Changwu Region,eight sedimentary microfacies models have been established. The braided stream delta facies and the lacustrine facies of Yanchang Formation have developed alternatively in Changwu Region,the sedimentary environments have gone through from onshore to underwater and back to onshore,which has led to many sets of favorable reservoir combinations. While the sedimentary micro-facies have controlled the sandstone bodys spreading and hydrocarbon accumulations, so the braided channel,underwater branch channel and river mouth bar are favorable facies belts of hydrocarbon accumulation.