岩石电阻率频散及其对阿尔奇参数的影响

岩石电阻率存在频散现象，频散性的强弱与地层水矿化度、含水饱和度、阳离子交换容量等有关。当地层水矿化度增高，饱含水岩石电阻率频散性减弱；当含水饱和度及地层水矿化度较低时，频散现象较明显。在其它情况基本相同时，泥质砂岩的阳离子交换容量越大，频散现象越明显。因此，岩石电阻率频散性影响着阿尔奇参数的变化。文中系统介绍了饱和度指数、胶结指数与频率之间的关系，认为实验室进行阿尔奇公式参数的测量应采取多频测量。

Study on Rock Resistivity Dispersion and Its Effect on Parameters for Archie Formula.

The resistivity of rock has the effect of dispersion, which is related to formation water salinity, water saturation and cation exchange capacity( Q V) . Formation water salinity increases with the decrease of resistivity dispersion of water saturated rock. While water saturation and formation water salinity are low, the dispersion is evident. Under the same conditions, the larger the cation exchange capacity ( Q V) of shaly sand is, the more evident the dispersion is. So rock resistivity dispersion has a bearing on the variation of the parameters of Archie equation. The relationship between saturation exponent, cementing factor and frequency is introduced in detail. Parameters for Archie formula are proposed to be determined by multifrequency measurement in laboratory.