混合泥质砂岩有效介质通用HB电阻率模型在高泥储层中的应用

Application of General Effective Medium HB Resistivity Model for Laminated and Dispersed Shaly Sand to

基于Berg提出的层状泥质或分散泥质砂岩有效介质HB电阻率模型,并在总孔隙中考虑粘土结合水的体积,但不考虑粘土结合水与地层水导电性的差别,将粘土结合水与地层水的导电性差别归结到粘土颗粒导电中,建立了混合泥质砂岩有效介质通用HB电阻率模型。通过研究混合泥质砂岩有效介质通用HB电阻率模型的求解方法,表明模型导出的关于Swt的方程是一个一元二次方程,可用求根公式求解,解法非常简单。通过对混合泥质砂岩有效介质通用HB电阻率模型中各参数的确定方法进行研究,给出了有效的参数确定方法。利用建立的混合泥质砂岩有效介质通用HB电阻率模型,对海拉尔盆地高泥地区的苏1、苏3井进行处理,并将模型计算的含水饱和度与试油结果进行对比,结果表明模型计算的含水饱和度是合理的。该模型适用于高泥地区的泥质砂岩地层解释。

Based on the effective medium HB resistivity models for laminated or dispersed shaly sands proposed by Berg, the general effective medium HB resistivity model for laminated and dispersed shaly sands is established. In the derivation of the model we assume that clay-bound water fraction is included in total pores, clay-bound water and formation water have the same resistivity, and yet the difference of electrical properties between the two waters is incorporated into clay grain conductivity. After deriving Swt from the model, we find out that the water saturation equation is a quadratic equation a-bout Swt, so its solution is very simple and obtained by using the standard quadratic-root formula. By studying the methods to calculate all parameters in the model, the effective methods are proposed. We interpreted log data of well SU1 and SU3 in very shaly formation of Hailaer Basin with the model and compared water saturation calculated from the model with production test results. It shows that water saturation calculated with the model is right. Therefore, the model proposed in the paper is adaptable to very shaly sands.