【摘要】 吐哈油田具有低孔隙度、低渗透率、低矿化度储层特征,其含水饱和度大于50%时,电阻率随含水饱和度增大而增大。室内岩心注水驱油实验表明,注入水矿化度与原始地层总矿化度相当时,电阻率随含水饱和度升高而降低;注入水矿化度小于原始地层水矿化度,电阻率随含水饱和度升高而不再单调下降,出现U形曲线。建立水淹层含水饱和度计算模型,结合过套管地层电阻率,经过多次迭代计算,可求得套后地层含水饱和度和套后地层含油饱和度。实际应用中,综合分析确定水淹阶段及混合水电阻率,结合阿尔奇公式,用U形曲线迭代方法寻找最优的含水饱和度值。更多还原

【Abstract】 Turpan-Hami oilfield is characterized by low porosity,low permeability and low salinity.When the formation water saturation is greater than 50%,reservoir resistivity increases with the rise of formation water saturation.The indoor core water injection displacement experiments show that resistivity decreases with the increase of formation water saturation when injection water salinity equals to raw formation water salinity.When injection water salinity is lower than formation water salinity,resistivity curve shows "U" shape when the water saturation increases,rather than monotonically decreasing.Established is the saturation calculation model for water-flooded layer.Formation water saturation and oil saturation for cased hole can be calculated through multiple iterative computations based on through casing formation resistivity.Optimalizing water saturation may be figured out by following steps:determining water flooding stage through comprehensive analysis;determining the mixed water resistivity;using "U" shape curve iteration method to compute water saturation combining with Archie equation.更多还原