薄互层砂岩油藏矢量布井方式

A STUDY OF VECTOR WELL PATTERN OF THIN INTERBEDDED SANDTONE OIL RESERVOIR

薄互层砂岩油藏具有纵向厚度大、单层控制储量规模小、储层非均质性强等地质特点,常规面积井网布井方式面临储量控制程度低、层间矛盾突出、采油速度低以及经济可行性差等问题,导致油藏整体开发效果较差。立足于含油砂体的储层沉积学成因特征,基于多孔介质渗流理论建立单砂体尺度的矢量井网布井方法,推导单砂体平面非均质矢量井网井距的设计公式,并根据井距设计公式构建物理模型开展平板模型水驱油实验,应用油藏数值模拟方法对油藏尺度矢量井网部署进行应用,形成薄互层砂岩油藏砂体叠置区域与非叠置区域的层系组合及布井方式的差异化开发技术对策。

Thin interhedded sandstone reservoir has such characteristics as great thickness, small monolayer control reserves and strong heterogeneity. If the conventional areal well pattern is used, the reservoir will have a poor overall development effect characterized by low reserves control degree, serious contradiction between layers,low recovery rate and poor economic feasibility. According to the sedimen- tologic features of the oil-bearing sand body, the method of vector well pattern placement in single sand body scale is established based on porous media seepage theory, and a well spacing design formula of vector well pattern for single sand body with areal heterogeneity is provided. On the basis of physical model developed by the provided well spacing design formula, the water/oil displacement experiment on planar models is launched. With the application of reservoir scale vector well pattern placement by reservoir numerical simulation, a specific development strategy of series of strata assemblage and well placement for superimposed area and non superimposed area of in- terbedded sandstone reservoir is established.