缝洞型油藏剩余油的主要存在形式分析

Analysis of Major Occurrence Modes of Remaining Oil in Karstic-fracture Reservoirs

将“拟颗粒模拟技术”应用至缝洞型碳酸盐岩油藏，设计多尺度缝洞网络概念模型，分析模型的水驱过程，揭示：由于溶洞和油井配置关系不理想，溶洞顶部滞留的洞顶剩余油和由于高导流通道而未被水体波及的剩余油是缝洞型油藏剩余油的主要存在形式。由模型的含水变化特征类比实体油藏单井的见水规律，选塔河4区S48单元TK412井为类比对象，在三维地质模型基础上，从储集体最高点逐级向下切片，按网格积分初步估算TK412井控制溶洞顶部滞留的“洞顶剩余油”110×10^4t。分析表明：油井含水达90％以上，仍然存在大量剩余油，油藏开发潜力极大。

The pseudo-particle simulation technology was first introduced to the study of karstic-fracture carbonate reservoirs. The multiscale fracture-cave network conceptual model was designed, and the water flooding process of the model was recorded. The research shows that when cave and well configuration is unreasonable, there is some residual oil in high local control point in the cave. What＇s more, residual oil also exists due to high conductivity fraeture, which was not affected by water. They are the two major forms of residual oil in karstic-fi-actured reservoir. According to the water change characteristics of multiscale fracture-cave network conceptual model, the reservoir analysis subject was defined to well TK412 ofS48 cell in the fourth block of Tahe Oilfield. According to the three-dimensional geologic model, from the highest point down, well TK412 is estimated to have 110 million tons of residual oil. According to the analysis, despite the more than 90% water ratio, there is still a large amount of remaining oil with great development potential.