泥质砂岩的复电阻率实验研究

Experimental Study on Complex Resistivity of Shaly Sands

研究了复电阻率实部频散度、模的频散度以及虚部频散度和含水饱和度的关系。当低频和高频分别为100Hz和10kHz,随着含水饱和度的增加,实部频散度下降,然而某些岩心的实部频散度与含水饱和度之间存在双解关系。复电阻率模的频散度随不同饱和度的变化与实部几乎一致;虚部的频散度与含水饱和度的关系密切,随着含水饱和度的增加而线性增加,虚部的频散度远远大于实部的频散度。

In this paper, the relation between percent frequency effect (PFE) of real part, image part and module of complex resistivity of shaly sands is studied. With water saturation increasing, the PFE of real part of some core samples decreases when the low frequency is 100 kHz and the high frequency is 10 kHz, but other samples show a different relation. The PFE of module has the same phenomenon. The PFE of the the image part linearly increases with the water saturation. When the water saturation is fixed, the PFE of the image part is higher than that of real part of a shaly sand sample.