华池油田长3油层沉积微相与含油性关系

对华 1 5 2井区沉积微相与含油性进行了较全面的分析 ,认为华 1 5 2井区长 3油层的沉积相为吴旗—华池三角洲前缘亚相的一个分支 .根据其岩性、电性及沉积构造特征 ,将其划分为 4个沉积单元 .每个单元又划分为水下分流河道、河口坝、天然堤、分流间洼地、分流间湾 5个沉积微相 ,每个沉积微相都有其独特的特点和沉积空间展布规律 .分析这些特征和规律 ,展示出华 1 5 2区长 3砂层是由水下分流河道砂体、河口坝砂体等多个微相叠合而成的复杂叠合体 ,从而构成典型的建设型鸟足状三角洲前缘砂体 .这一砂体的特征是鄂尔多斯盆地延长组上部储层的典型代表 ,也是形成油藏的主要砂体

Relationship Between Sedimentary Microfacies and Oil-bearing Characteristic of Chang3 Oil Reservoir in Huachi Oilfield

The sedimentary microfacies and oil bearing characteristic of Hua 152 wellblock are comprehensively analyzed. It is held that the sedimentary facies of Chang3 oil reservoir in the well block is a branch of Wuqi Huachi delta front subfacies. According to its lithology, electric property and/or sedimentary structural characteristics, the oil reservoir can be divided into four sedimentary units. Each unit is subdivided into five sedimentary microfacies of subaqueous channel, debouch bar, raised bank, interdistributary depression, and interdistributary bay. Each sedimentary microfacies has itself unique feature and sedimentary space distribution law. Analysis of these features and laws shows that Chang3 sandstone reservoir is a complex superposition composed of subaqueous distributary channel sandbody, debouch bar sandbody, etc. They constitute a typical constructive digitate delta front sandbody. This sandbody is a typical representative of the upper reservoirs of Yanchang Formation, Eerduosi Basin, and it is also main sandbody to form the oil reservoir.