葡浅12区块黑帝庙油层黑Ⅰ砂组沉积微相研究

Study on sedimentary microfacies of the Hei Ⅰ sand unit in the Puqian 12 block

通过岩心观察、粒度分析,沉积构造特征和测井相分析,结合区域地质背景,对葡浅12区块黑Ⅰ砂组的沉积特征及沉积模式进行研究。确定该区为三角洲前缘亚相沉积,可进一步细分为水下分流河道、河口坝、席状砂、水下分流间湾及席间泥5种沉积微相类型,并对研究区各小层沉积微相平面展布特征和演化规律进行研究。结果表明,水下分流河道、河口坝砂体厚度和规模较大,具有良好的储集性能,是勘探开发的重点。

The sedimentation characteristics and sedimentation model of the Hei Ⅰ sand unit in the Puqian 12 block are studied through core observation,grain size analysis,sedimentary structure and electrofacies analysis coupling with regional geologic setting.This area is defined as delta front subfacies,which can be subdivided into five microfacies such as submerged distributary channel,mouth bar,sand sheet,submerged distributary interchannel,and inter-sand sheet shale.The distribution and evolution of each microfacies in the study area are also studied.The result shows that the submerged distributary channel and mouth bar have thick and large scale sand bodies and good reservoir quality,and are the focus of exploration and development.