胜坨油田储层非均质性及与剩余油分布的关系

The relationship of reservoir heterogeneity and residual oil distribution in Shengtuo Oilfield

以胜坨油田坨21断块为研究对象,利用模糊数学方法求取非均质综合指数,来表征储层非均质特征;运用非均质综合指数建立储层非均质模型,分析储层层内、层间、平面和空间非均质性,探讨其与剩余油分布的关系。结果表明:研究区内储层的层内、层间非均质性以中等—较弱为主;平面和空间非均质性较为复杂,其分布与沉积微相的展布特征有很好的对应关系;储层非均质性的影响因素有沉积微相、成岩作用、长期注水开发和构造运动;研究区剩余油主要分布在砂体规模较大、呈中等—较弱非均质性的储层中。

Tuo21 fault block of Shengtuo Oilfield has been studied for the synthetic index of heterogeneity by using fuzzy mathematics to characterize reservoir heterogeneity. A model of reservoir heterogeneity is established with the synthetic index to analyze intra-layer, inter-layer, areal and spatial heterogeneity and the relationship with residual oil distribution. The result indicates that in the study area, the intra- and inter-layer heterogeneity is medium to weak; the areal and spatial heterogeneity is more complicated, showing well correspondence with the distribution of sedimentary microfacies; the influential factors of reservoir heterogeneity are sedimentary microfacies, lithogenesis, long-term waterflooding, and tectonic movement; and residual oil mainly distributes in large sands with medium to weak heterogeneity.