三角洲前缘河口坝复合体剩余油分布物理模拟

Experimental simulation of remaining oil distribution in combined debouch bar of delta front reservoir

以陆梁油田陆9井区K_1h_2^(7-4)小层为例,遵循河口坝构型模式和增生体发育模式,对河口坝复合体内不同类型夹层进行识别并统计坝体发育规模。根据相似准则设计河口坝复合体试验模型,开展水驱油物理模拟,分析隔夹层对剩余油分布的影响及水驱后的剩余油分布规律。模拟结果表明:剩余油在河口坝复合体内部四级界面对应的稳定隔层以及单一河口坝内部三级界面对应的不稳定夹层附近富集;顶部或底部具封隔能力的夹层比中部夹层更有利于剩余油富集;夹层发育规模越大,倾角越大,阻碍流体运动能力就越强,越有利于剩余油富集;隔、夹层相交形成的三角形区域剩余油富集。

Taking the K 1h 2^7-4 Formation of Lu9 block in Luliang Oilfield as an example,the different types of interlayers in the combined debouch bar were identified.The scale of bar was measured according to the debouch bar architecture model and the inner accretion layering model.The experimental model of the combined debouch bar was designed according to similarity criterion,and physical simulations of water flooding were carried out.The influence of the interlayer on the remaining oil distribution and the remaining oil distribution after water flooding were analyzed.The simulation results show that:the remaining oil is enriched near the stable interlayer corresponding to the forth level interface within the combined debouch bar,and near the unstable interlayer corresponding to the third level interface within the single debouch bar.These interlayers with a top or bottom sealing capacity are more favorable for the remaining oil enrichment relative to the central interlayer with a certain sealing capacity.Interlayers with larger scale and greater inclination angle usually lead to stronger obstruction of the fluid movement,resulting in more remaining oil enrichment.The triangular region formed by the intersection of the interlayers is more favorable for the enrichment of remaining oil.