利用压汞资料计算复杂断块油藏油水相对渗透率曲线

Determination of oil-water relative permeability curves by using mercury injection data for complex fault block reservoir

复杂断块油藏具有非均质严重、油水关系复杂的特点,常规方法获取的相对渗透率曲线很难反映出复杂断块油藏的特点。文中结合分形理论,应用Purcell和Burdine相对渗透率计算方法,推导计算出不同毛细管力曲线对应的油水相渗曲线,并利用物性综合指数进行分类,确定实际油藏内部的多套渗流规律及非均质情况。结合唐家河油田实际数据进行相渗曲线计算、分类及应用,得到的历史拟合结果更符合复杂断块油藏的实际渗流规律,为油藏开发评价及油藏精细数值模拟研究提供数据支持。

Fault Block Reservoirs are characterized by broken structures, severe heterogeneity and complicated oil-water systems.Relative permeability curves obtained by the traditional methods cannot reflect reservoir heterogeneity. Based on the fractal theory,Purcell and Burdine formulae, a new method of calculating relative oil-water permeability is derived by using the mercury injection data, and the results can be divided into several grades by the aggregative index of physical property to identify the seepage laws and heterogeneity of the reservoirs. It was applied in the Tangjiahe Oilfield. The relative permeability curves calculated using the new method are more representative and can reflect the real reservoir performance. The new method can be applied in reservoir evaluation and accurate numerical simulation.