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对大港油田高孔高渗和中孔、中渗两种类型油藏进行注水前后油藏参数变化规律研究后发现,油藏经过长期注水开发后,高孔高渗油藏粘土矿物和胶结物含量减少,溶蚀孔隙增多,整体表现出储层孔喉连通性变好、物性改善的趋势;而中孔中渗油藏大部分储层则会出现渗流通道被堵塞、随着注水的进行注水压力大幅提高。Ⅱ类油藏注水开发后,储层非均质性变强,储层逐渐变为亲水性,原油性质也表现出变差的趋势。
The study on the variation of reservoir parameters before and after waterflooding of high-porosity, medium-porosity and medium-permeability reservoirs in Dagang Oilfield shows that after long-term waterflood development, the content of clay minerals and cements in high porosity and permeability reservoirs The porosity and dissolution of the reservoirs increase, the overall performance of the reservoir pore throat connectivity becomes better, physical properties tend to improve; while most of the reservoirs in the mesoporous medium permeability reservoir will appear seepage channel is blocked, with the water injection pressure improve. After the waterflooding of Class Ⅱ reservoir, the reservoir heterogeneity becomes stronger and the reservoir gradually becomes hydrophilic, and the nature of the crude oil also shows a deteriorating trend.