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分流河道砂体是临南油田重要的勘探开发目标,可分为水上和水下2种类型。运用正演模拟、地质统计、地震相分析等技术手段,分析了分流河道砂体的地震反射特征,划分了三角洲平原亚相和前缘亚相的分布范围,总结了分流河道砂体的分布规律。研究表明:临南地区水下分流河道砂体主要发育在三角洲前缘亚相,其地震反射特征为连续性相对较好的中—强反射,厚度中心在街3井—夏53井之间;水上分流河道砂体发育在三角洲平原亚相,地震反射特征为短轴状—杂乱反射,中—弱振幅,连续性差—中等,尖灭点不易分辨识别,主要分布在街3井以南的地区。
The distributary channel sand body is an important target of exploration and development in Linnan Oilfield. It can be divided into two types of water and underwater. Seismic reflection features of distributary channel sand body are analyzed by means of forward modeling, geostatistics and seismic facies analysis. The distribution of subfacies in delta plain and frontier is divided and the distribution of distributary channel sand body is summarized . The results show that the submarine distributary channel sand body in Linnan area is mainly developed in the delta front and the seismic reflection features are medium-strong reflection with relatively good continuity. The center of thickness is between Block 3 and Xia 53; The water distributary channel sand body is developed in the delta plain subfacies. The seismic reflection characteristics are short-axis-miscellaneous reflection, medium-weak amplitude, poor continuity-medium, and the pinch-out point is not easy to distinguish and distinguish, mainly distributed in the area south of Block 3 .