扶余油田注水开发过程中储层非均质性动态演化特征

Dynamic Evolution Characteristics of Reservoir Heterogeneity in the Process of Water Injection Development in Fuyu Oilfield

研究油田注水开发过程中储层非均质性的动态演化特征,对于查明剩余油分布规律意义重大。扶余油田已进入高含水期,综合含水率已超过90%。为了科学有效地开发该油藏,调动剩余油潜力,有必要针对储层的宏观和微观非均质性进行深入细致的研究。选取不同含水期密闭取心井的物性、薄片、电镜、压汞及粒度等分析化验资料,通过详实对比分析储层不同含水期的物性和非均质性变化特征,得到了储层高含水期非均质性相关参数的动态演化规律。研究表明,扶余油田储层非均质性随含水率上升而逐渐减弱,呈现出由低含水期的中孔、中渗储层向高含水期的中高孔、中高渗储层演化趋势;注水开发对孔隙半径影响较小;储层碎屑颗粒在低含水期以接触式为主,中高含水期转变为孔隙-接触式、接触-孔隙式接触,高含水期以孔隙式接触为主。

The study of the dynamic evolution characteristics of reservoir heterogeneity in the process of oil- field water injection development, to find out the identification of remaining oil distribution and make a reasonable development plan, has been extremely important. The Fuyu Oilfield has entered the high wa- ter-cut stage, and the comprehensive water-cut has been more than 90%. In order to develop the scientific and effective reservoir and mobilize the residual oil potential, it is necessary for the macroscopic and micro- scopic of the reservoir heterogeneity to research with intensively. Selecting petrophysical properties, cast- ing sheet, electron microscopy, mercury intrusion and particle size of the different water-cut stage of seal- ing core, the characteristics of reservoir physical properties, macroscopic and microscopic heterogeneity variation in the low, medium and high water-cut stage are comparatively analyzed, and the dynamic change rules of reservoir heterogeneity in high water-cut stage are obtained. Studies shows that the heterogeneity of reservoir varies with water injection development and change in Fuyu Oilfield, the medium-porosity and medium-permeability reservoir in low water-cut stage transition to the medium to high-porosity and medi- um to high-permeability reservoir in high water-cut stage, and the heterogeneity weakened. The microscopic pore types of reservoir divided into intergranular pores and intergranular dissolved pore, water injection develop- ment on the median and the mean radius have the small influence degree. The reservoir clastic particles in early and low-water-cut stage are given priority to the contacting relationship with contact-based in high water-cut stage into the pore-contact, touch-pore type, pore high water-cut stage in the main contactor. The reservoir clastic particles in low and medium water-cut stage are given priority to with contact, middle and high water-cut stage transfer to the pore-contact, contact-Pore type, high water-cut stage transition to pore type.