面三块主力砂体注水开发特征分析

On Water-flooding Characteristics of the Main Sand Body in Mian 3 Block

面3块位于八面河油田主体构造带中部,油藏类型为一个浅层、特高孔、中高渗、常温常压、普通稠油Ⅰ类构造-岩性油藏。该单元纵向上主要含油层系有3组共16个含油小层,受沉积、构造等多种因素影响,各含油小层的开发特征存在差异。在剩余油分析的基础上,对其中采出程度低于单元平均采出程度16.9%的主力砂体的开发特征进行分析研究。其中,S_3~上3_(1-1)砂体面2-7-7井区,S_3~上4_25_(12)砂体有效厚度>2m的区域,S_41.2砂组有效厚度>2m的区域,以及S44砂组剩余油富集区,均能实现2.0t以上产能,为后续面3块剩余油挖潜提供依据。

Mian 3 Block is located in the central part of the main tectonic belt in Bamianhe Oilfield, belonging to Class 1 structure--lithology reservoir containing common heavy oil with the characteristics of superficial layer, extra--high porosity, medium--high permeability and normal pressure and temperature. There are 3 groups of main oil--bearing series longitudinally consisting of 16 small oil layers. Influenced by deposition, structure and other factors, they are differont in water--flooding characteristics, On the basis of analysis of remaining oil, this paper studies water-- flooding characteristics of 16. 9 ~ main sand bodies whose recovery percent is lower than the unit average recovery percent and provides the basis for the follow--up remaining oil tapping in Mian 3 Block.