Abstract: At present, the studies of waterflooding and distribution of remaining oil that from "Mega" of meter-hundred meters scale turns to "Macro" of centimeter-decimeter scale is the developing tendency for studying reservoirs and the devdeloping performance are in the high water stage.The numerical simulation water-flooding research for heterogeneous oil reservoir in lamina sacle was conducted.An expert knowledge general models of heterogeneous oil reservoir in lamina scale were established.The depositional characteristics of actual reservoirs of these models were analysed, it is considerd that the reservoir of different rhythm types such as positive and opposite rhythm all consist of some small units of positive rhythm.Distribution water-flooding remaining oil in lamina scale was studied, 36 programs were calculated altogether.The effects of rhythmicity (positive and opposite rhythm), beddings (horizontal, oblique and cross bedding), oil viscosity, ratio of vertical and horizontal permeability, permeability, permeability contrast and capillary pressure on water displacement performance and distribution of waterflooding remaining oil were studied.The obtained results showed that the oil viscosity is a very important factor to effect waterflooding characteristic of reservoir, and waterflooding effect for oblique and cross beddings are better than horizontal bedding.Lamina controls subtle distribution of remaining oil which have guiding sense for developing remaining oil in centimeter scale.

Key words: lamina, rhythy, heterogeneity, water displacement performance, remaining oil, numerical simulation

摘要： 油田水淹规律及剩余油分布研究由米到百米级的“大尺度”,转向厘米到分米级的“小尺度”,是当前高含水期油田的储层及动态研究的发展趋势。为此,进行了纹层级非均质储层水淹规律的数值模拟研究。利用专家知识建立了具有普遍意义的纹层级微沉积相模型。这个模型在分析了实际油层的沉积特点后认为,对于正韵律、反韵律等不同韵律类型的储层,都可以由多个正韵律小单元组成。应用多功能模拟器进行了油藏数值模拟,研究了纹层级的水驱剩余油分布,进行了纹层级非均质储层水淹规律与剩余油分布的一体化研究;计算了36个方案。研究了油层韵律性(正韵律、反韵律)、层理类型(水平层理、斜层理、交错层理)、原油粘度、垂直渗透率与水平渗透率比值、渗透率、渗透率级差、毛管压力对水淹规律和剩余油分布的影响。得出的关于原油粘度是影响油层水淹特征最重要的因素;交错层理与斜层理水驱效果好于水平层理;沉积纹层控制剩余油的细微分布等结论,对于开采厘米级的剩余油有指导意义。

关键词: 纹层, 韵律, 非均质性, 水淹规律, 剩余油, 数值模拟