石南油田石南21井区头屯河组二段储层精细描述

Fine Reservoir Description of the 2nd Member of Toutunhe Formation in Wellblock Shinan21 of Shinan Oilfield

针对石南21井区头屯河组二段(J2t2)砂体开展了储层精细描述研究。采用地震正演方法确定了石南21井区砂体在东部与基007井区砂体的关系,认为二者并不连通。采用地震反演方法确定了砂体北部及西部岩性边界。精细沉积微相研究表明研究区为三角洲前缘沉积,主要发育水下分流河道及河口坝微相,砂体较为发育。通过相控随机建模建立研究区三维地质模型,确定了储层物性及钙质夹层的空间分布。

According to the characteristics of J2t2 sand body, the fine reservoir description was carried out . Based on seismic forward modeling technology, the relation between Sand Body Wellblock Shinan 21 and Sand Body JI007 were determined and both were not connected. The north and the west lithological boundaries were identified by seismic inversion . It is concluded that reservoirs in Wellblock Shinan 21 are the delta front sedimentary,the sedimentary microfacies types of the major sand bodies are underwater distributary channels and mouth bar and bays. 3D stochastic geological model is built under the control of microfacies model. The spatial distribution of property and calcicolous intercalation are determined.