大庆油田一类油层聚驱潜力逐年减少, 二类油层开发技术还在试验完善阶段, 未能大面积实施于工业化区块。针对南二区东部二类油层河道砂发育规模明显变小, 小层数目增多, 单层厚度变薄、渗透率变低的储层特点。为了使二类油层提高采收率, 通过研究确定二类油层的选层标准、油层沉积特征, 考虑层系组合的多项影响因素, 对该区块聚驱上返二类油层进行了合理的层系组合研究, 确定了上返层系厚度及注采井距, 为该区块聚驱上返层系组合提供了依据。

Polymer flooding of the first class oil layer is on the decrease in Daqing Oilfield, and the development techniques of the second class oil layer are in developing at present. The second class oil layer is characterized by decreased channel sand, increased sublayers, thinning single layer, low permeability. In order to enhance oil recovery, the strata combination is analyzed based on the study on layer selection criterion, deposition characteristics and the influencing factors. The thickness of the upward strata and the producer-injector spacing are determined, which will provide reference for the strata combination in this area.