东辛油田多油层复杂断块油藏高含水后期细分层系研究

Layer subdivision in the late high water cut stage in the complex fault block reservoirs, Dongxin Oilfield

东辛油田是多油层复杂断块油藏,开发后期存在层间干扰严重和储量动用不均衡的问题。渗透率、主力油层数、油层厚度、原油性质、含油面积、储量规模等参数对开发层系划分有较大影响,根据大量矿场统计和数值模拟结果,提出了相对定量化的开发层系划分标准。应用聚类分析综合评价技术,实现了开发层系划分的程序化和标准化。矿场实践表明,科学划分开发层系研究成果可信度较高,根据研究成果调整开发层系的单元采收率提高3.1%。

Severe interlayer interference and reserves production imbalance occur in the late high water cut stage in the complex fault block reservoirs of the Dongxin Oilfield. Parameters as permeability, the number of main layers, pay thickness, oil properties, oil-bearing area and reserves scale have great influence on layer division. According to the results of onsite statistics and reservoir simulation, the layer division criterion is presented. The layer division is routinized and standardized using the clustering analysis integrated estimation technique. Field practice shows that the presented layer division method is reliable. The production layer was adjusted according to the research result and the oil recovery was increased 3.1%.