大港油田注水开发过程中油藏参数变化规律分析

对大港油田高孔高渗和中孔中渗2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增大、物性变好的趋势;而中孔中渗油藏大部分储层呈现喉道堵塞、孔喉减小、物性变差的趋势。2类油藏注水开发后,微观和宏观非均质性都有所增强,储层润湿性向强亲水方向转化,原油性质也表现出变差的趋势。该项研究对高含水油藏的后期开发有重要的指导意义。 

VARIATION LAW OF RESERVOIR PARAMETERS DURING WATERFLOODING IN DAGANG OIL FIELD

Researches on the variation law of reservoir parameters of both high porosity high permeability and medium porosity medium permeability reservoirs during water flooding in Dagang oilfield indicate that after long time waterflooding reservoirs show regular changes.In high porosity and high permeability re-servoir,contents of clay mineral and cement decrease,dissolution pores increase,pore-throat enlarges and reservoir physical properties are improved.Whereas most of medium porosity and medium permeability reserviors show the trend that pore-throat reduces and reservoir physical properties become poor.The two types of reserviors bear similar trends that the microscopic and macroscopic heterogeneity is enhanced,the wettability changes into strong water-wetting and the properties of crude oil become poor.This research is significant in later development of high water cut reservoir.