点坝建筑结构控渗流单元划分及剩余油分布研究

发布时间：2018-04-28 05:56

本文选题：夹层遮挡性 + 夹层岩性　；参考：《中国矿业大学学报》2016年01期

【摘要】：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.
[Abstract]:In order to identify the remaining oil accumulation areas in the sand body of the meandering river point dam in the high water-cut stage of oil field, the core observation and log curve intersection analysis are used by using the core data of the closed coring wells and the dense development wells. The occlusion of interlayer and the distribution of residual oil were studied by means of structural anatomy and so on. The minimum return value of micropotential and the return rate of microgradient are used as the criteria for distinguishing intercalation lithology, the interlayer occlusion is divided by the contrast value of oil saturation difference between adjacent sand bodies of intercalation, and the seepage units in the sand body of point dam are divided by interlayer occlusion. The results show that the interlayer occlusion is divided into four types, the identification coincidence rate is 72and the seepage element is composed of 2 ~ 3 lateral aggregates with a boundary of complete flow resistance intercalation, which is separated by a strong flow limiting interlayer. The distribution of remaining oil in point dam sand body is controlled by seepage unit, which is mainly concentrated in the middle and upper part of undrilled seepage unit. The oil displacement efficiency of sand body between adjacent intercalation layers in seepage unit is affected by interlayer occlusion, showing a positive rhythm of high range difference or low grade difference. This will lay the foundation for the remaining oil in the sand body of the dam.
【作者单位】：东北石油大学地球科学学院;大庆油田有限责任公司勘探开发研究院;大庆油田有限责任公司第一采油厂;
【基金】：国家自然科学基金项目(41172135)
【分类号】：TE327

【参考文献】