海南油田东营三段沉积微相及其与油气的关系

海南油田储层东营组三段为三角洲前缘沉积，发育水下分支河道，分流间，河口砂坝及席状砂等4个微相。其中，以水下分支河道，河口砂坝的油气储集性能为最好，席状砂次之，分流间湾较差。本区沉积微相决定了储层的性质与展布，进而控制油气的储集和分布。储层评价以下部储集层最好（以水下分支河道为主），上部储集层次之（以河口坝及水下分支河道为主），中部储集层较差（以分流间湾，席状砂为主）。

SEDIMENTARY MICROFACIES AND ITS RELATION TO HYDROCARBON OF THE THIRD MEMBER OF DONGYING IN THE HAINAN OILFIELD

Deltaic front subfacies is believed to develop well in the reservoir of the third member of Dongying of the Hainan Oilfield, which mainly include four subfacies: namely subaqueous distributary channel, flood plain, river-mouth sand bars and sheet bar sands. Referring to reservoir properties, the subaqueous distributary channel and river-mouth sandbars are the best, followed by sheet bar sands. The poorest one is flood plain. In the study area, sedimentary microfacies determines reservoir properties and further controls the reservoir and distribution of hydrocarbon. The result of reservoir evaluation shows that the best is lower reservoir, mainly composed of microfacies of subaqueous distributary channel; the second is the upper reservoir, mainly composed of microfacies of river-mouth sand bars and subaqueous distributary channel. The property of the middle reservoir is relatively poor, which is chiefly composed of sedimentary microfacies of flood plain and sheet bar sands.