容积法储量计算方程合理性分析

Rationality analysis of volumetric reserve estimation equations

准确计算储集岩孔隙中的油气体积(即油气储量)是制订油气藏开发方案的基础,而储量参数确定的合理与否又是评价油气储量的核心。通过对容积法储量计算方程的合理性分析可知,计算油气储量的孔隙度和饱和度必须是匹配的,即地层总孔隙度与原始含油饱和度(或含油饱和度)相对应,地层有效孔隙度与有效含油饱和度(或有效原始含油饱和度)相对应,否则计算的油气体积会与储集岩孔隙中的实际油气体积不统一。在此基础上,建立了新的容积法系列地质储量计算方程,从而使计算的地质储量相对误差由原来的[100(фt-ф)/фt]%或[100(Soe-Soi)/Soe]%降为零。

Accurate estimation of oil and gas volume in reservoirs(i.e.oil and gas reserves) is the basis of making reservoir development plan,and the rationality of reserve parameters is essential to reservoir estimation.Rationality analysis of volumetric reserve estimation equations indicates that porosity and saturation must match,namely total porosity corresponds to original oil saturation(or oil saturation),and effective porosity corresponds to effective oil saturation(or effective original oil saturation),otherwise the estimated oil and gas volume may be inconsistent with the actual volume in reservoir.On this basis,a new series of volumetric reserve estimation equations is established,thus reduced the relative error of geologic reserves estimation from [100(фt-ф)/фt ]% or[100(Soe-Soi)/Soe ]% to zero.