王集油田西区油藏特征的再认识

Restudy of characteristics of reservoirs in west block of Wangji oilfield

综合地震、地质、试油、试采等资料研究分析认为,王集油田西区构造上原认识的9号断层一分为二, 即9号和10号。该区储层以北西向的王集三角洲沉积砂体为主,沉积相可细分为水下分流河道、河口坝、 前缘席状砂和前三角洲亚相。油层分布在H3Ⅳ-Ⅶ油组,以Ⅴ-Ⅶ油组为主,油藏类型以受91号断层 控制的构造油藏为主,油层沿该断层呈屋脊状分布,迭合性差,含油高度较低,含油宽度较窄等特点,但研 究分析认为该区具有较大的增储潜力。

Comprehensive study of seismic, geologic, formation testing and production testing data indicates that the No. 9 fault, previously delineated in west block of Wangji oilfield, should be divided into two faults, i. e. No. 9 and No. 10. The reservoirs in this area mainly are NW - trending Wangji delta sandbodies, which can be further divided into subfacies including underwater distributary channel, mouth bar, front sand sheet and predelta. Oil layers are mainly distributed in Ⅳ - Ⅵ oil units of the 3rd member of Hetaoyuan Fm, of which Ⅴ - Ⅶ oil units are the major ones. Reservoirs are mainly of structural types under control of No. 91 fault. Oil layers distribute along this fault and are characterized by poor overlapping, low oil column and narrow oil - bearing width. However, it is believed that this area has relatively large potential to add reserves.