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MTZ油田Z断块位于苏北盆地高邮凹陷北斜坡带西部,为北东东向展布、受断鼻构造控制的层状砂岩油藏,储层孔隙度为10.2%～15.7%,渗透率为5.4×104～39.5×104μm2,地下原油黏度为14～20mPa·s,含油面积为2.5km2,探明储量为491×104t,多数油井已进入中高含水阶段。由于储层物性、沉积相带、井网完善程度的差异,导致注入水沿优势通道窜流,注入水利用率低,油水关系及剩余油分布复杂,因此判断油井的主要来水方向、识别无效注水井是改善注水效果、提高采收率的先决条件。分析了内部小断层、稠油环、微构造、沉积相、韵律类型、压裂等多种因素对Z断块油水运动的影响,并指出利用流线模拟计算的油水井分配系数可定量描述油水井之间的相互影响程度,判别出低效注水井及油井的来水方向,指导油水井的动态调配,从而使水驱前缘均衡推进,增大波及系数,提高水驱效率。
The Z-block of MTZ is located in the west of the northern slope of the Gaoyou Sag in northern Jiangsu Basin. It is a sandstone reservoir sandstones distributed in the NE direction and controlled by the nose structure, and has a porosity of 10.2% -15.7% and a permeability of 5.4 × 104 ~ 39.5 × 104μm2, the viscosity of underground crude oil is 14 ~ 20mPa · s, the oil-bearing area is 2.5km2, and the proven reserves is 491 × 104t. Most oil wells have entered the middle-high water cut stage. Due to differences in reservoir physical properties, sedimentary facies belt and well pattern, leading to channeling of injected water along dominant channels, low utilization of injected water, complex relationship between oil and water and the remaining oil distribution, the main direction of water in oil wells is judged and identification is invalid Water injection well is a prerequisite for improving water injection and improving oil recovery. The effects of internal faults, heavy oil rings, microstructures, sedimentary facies, rhythm types and fractures on the movement of oil and water in block Z are analyzed. It is also pointed out that the oil-water well partition coefficient can be used to describe oil quantitatively The interaction between wells, to identify inefficient water injection wells and wells incoming direction to guide the dynamic deployment of oil and water wells, so that the water front drive balanced advance, increase the sweep coefficient, improve water flooding efficiency.