海上S油田注水开发后期储层物性变化规律及应用

注水开发是提高油田开发效果的主要措施,长期注水对储层物性有较大影响。采用室内实验,测井参数解释及油藏数值模拟方法对渤海S油田的孔隙度、渗透率以及原油的黏度3种主要物性参数进行分析,总结出了注水开发前后储层物性的变化规律。研究认为:经过长期水驱后,油田的平均孔隙半径、平均孔隙度和渗透率整体都有所增加,但表现出两种相反的变化趋势:高渗透储层渗透率增加,大孔隙的数量逐渐增多;低渗透储层孔隙度、渗透率减小。储层这两种相反的变化趋势导致储层非均质性更加严重,储层层间矛盾日益突出。油田原油性质表现出黏度增加,胶质和沥青质含量上升等变差的趋势。通过采取分层酸化、分层调剖以及优化注水的措施,油田取得了较好的增油效果。

Research and Application of the properties variation regularity of water injection reservoirs in S offshore oilfield

Water-injection is a main measure to improve the efficiency of oilfield development, long-term water-injection has a great influence on the properties of reservoir. Through the analysis of the porosity,permeability,crude oil viscosity of S oilfield,compare the changes of water flooding and influence between them. on the basis,summarizes the rule of the variation of reservoir properties before and after water injection development,and analyzes the relationship between dynamic changes of reservoir properties and reservoir production. Studies suggest that: after a long period of water flooding,the average pore radius,average porosity and permeability of S oil field have increased,but exhibit two opposite trends: increasing the high permeability reservoir permeability,large pore number increased gradually;reservoir porosity,permeability of low permeability less.The reservoirs of these two opposing trends lead to more serious reservoir heterogeneity,reservoir interlayer contradiction. Crude oil properties showed increased viscosity, resin and asphaltene content increased, the trend of deterioration. By taking layering acidification, stratified injection profile control and optimization measures,S offshore oilfield achieved good effect of increasing oil.