Abstract: A new method for determining Archie's parameters using saturation analysis data was presented.Correlations among saturation,resistivity and porosity were derived from the two Archie equations,and the calculation of Archie's parameters was converted to a problem for calculating a coefficient of an equation with several unknows. The calculation and study on actual saturation analysis data in several oilfields of Junggar Basin show that the calculated parameters are all within the theoretical range,and this method can be used to get saturation values with logging data.The key factors influencing Archie's parameters,especially the influence of petrophysical properties and wettability, were discussed.Archil's parameters determined with satuation analysis data are in a wide range.Furthermore,determining Archie's parameters using saturation analysis data allows it unnecessary to calculate resistivity of formation water.Saturation should be measured in the very sealed fields.Some errors between the measured values and the original values would exist due to the degasification and volatilization of tested samples,which influences the effectiveness of saturation data.Therefore,it is important to correct the measured saturation values.

Key words: Archie’s parameters, rock property, formation water, resistivity, porosity, saturation

摘要： 提出了利用饱和度分析资料确定阿尔奇公式中参数的新方法,根据阿尔奇的两个基本公式推导出饱和度与电阻率和孔隙度的关系,将阿尔奇参数的求值问题转化为求解系数的一次多元方程问题.应用该方法对准噶尔盆地几个油田的实际饱和度资料进行了分析和计算,求出的参数均在理论值范围内,可以满足利用测井资料计算饱和度的要求.讨论了岩石物性和岩石润湿性对阿尔奇参数的影响.结果表明,由饱和度分析资料确定的阿尔奇参数变化范围很大,而通过岩电实验确定的阿尔奇参数则不能完全反映出参数变化范围.应用饱和度分析资料求解阿尔奇参数避开了求解地层水电阻率值的问题.饱和度的测定是在井场密闭良好的情况下进行的,但由于在测量过程中饱和度样品存在脱气、挥发等损失,使得实际测量值与原始值之间存在较大偏差,这势必影响饱和度资料的应用效果,因而要对饱和度测量结果进行校正.

关键词: 阿尔奇参数, 饱和度, 岩石物性, 地层水, 电阻率, 孔隙度