X油藏剩余油分布规律研究

Study of distribution regulation of remaining oil in X reservoir

为了提高中高含水期油藏采收率,有必要弄清楚油藏剩余油分布规律,识别剩余油成因。在储层精细描述的基础上,结合生产动态特征,应用油藏数值模拟技术对X油藏剩余油分布进行了研究。对全油藏187口生产井进行生产历史拟合,拟合精度达到86%,符合工程精度要求。通过历史拟合结果分析,平面上剩余油分布呈连片状和交错状两种,纵向上由于物性差异,剩余油主要分布在储量基数大,物性较差的4小层。在此基础上,对油藏剩余油成因进行了分析,并且得到了各类型剩余油所占比例,即井网不完善型、井间滞留型、断层遮挡型和层间干扰型。

In order to improve oil recovery at high water-cut stage, it is necessary to realize the distribution regulation and forming reasons of remaining oil. On the basis of delicate reservoir description, combined the feature of production performance, the remaining oil distribution of X reservoir is studied with the application of reservoir numerical simulation.History matching is carried out on 187 production wells, and the matching accuracy reaches86 % that conforms to the requirements of the engineering precision. Through the analysis of the history matching results, there are two distribution modes in the plane, schistose remaining oil and interlace mode remaining oil. While in vertical direction, due to the physical differences, the remaining oil is mainly distributed in the fourth layer with large reserves and poor physical property. With the result, the forming reasons of the remaining oil are analyzed and obtain the proportion of each type of remaining oil, which contain well pattern type, inter well type, fault type and interlayer interference type.