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为了识别油田高含水期、3次采油阶段曲流河点坝砂体内部剩余油富集区,利用密闭取心井岩心及密集开发井测井资料,采用岩心观察、测井曲线交汇分析、建筑结构解剖等方法,对夹层遮挡性及剩余油分布进行了研究.提出了以微电位回返最低值和微梯度回返率作为夹层岩性判别标准;以夹层相邻砂体含油饱和度差对比值划分夹层遮挡性;以夹层遮挡性划分点坝砂体内部渗流单元.结果表明:夹层遮挡性分为4种类型,识别符合率达72%;渗流单元以完全阻流型夹层为界,平均由2~3个侧积体构成,其间以强限流型夹层相隔;点坝砂体内部剩余油分布受控于渗流单元,主要富集在未被钻遇的渗流单元中上部,渗流单元内部相邻夹层间砂体驱油效率受夹层遮挡性影响,呈高极差或低级差的正韵律,以此为挖潜点坝砂体内部剩余油奠定基础.
In order to identify the remaining oil-rich areas inside the meandering bar dam body in the 3rd oil recovery stage in the high water-cut stage and the third oil recovery stage, using the core of the closed coring well and the well logging data of the intensive development well, the core observation, intersection analysis of logging curves, Structure dissection and other methods to study the occlusion of the interlayer and the distribution of remaining oil.The proposed method is based on the criterion of lithology of interlayer lithology with the minimum of micro-potential return and micro-gradient regression rate. The results show that there are four types of interbeds in the point bar sandbodies, and the coincidence rate of recognition is up to 72%. The seepage units are bounded by totally baffled intercalations, with an average of 2 ~ 3 lateral accumulations, separated by strong restriction type interbed; the residual oil distribution in the point bar sandbodies is controlled by seepage units, mainly concentrated in the upper part of seepage units that have not been drilled, The efficiency of oil displacement in inter-sandstone is affected by the interception of interlayer, showing a positive rhythm of high or low level difference, which lays the foundation for remaining oil inside potential dam body.