Experimental data are presented for the real part of the dielectric constant (K") of three sandstone samples as a function of the level of water saturation (SW) in the frequency range60 kHz to 4 MHz. Existing theoretical models have previously shown poor agreement with K" versus SW data for rock samples, undoubtedly due to the complexity involved in adequately accounting for geometrical and electrochemical effects. In analysing the data presented here, we find in all cases a pronounced increase in K" in the low saturation region which can be attributed to the establishment of geometrical and surface effects associated with the rock/water interface. When this surface enhancement in K" is accounted for by using wetted matrix parameters, the data show excellent agreement with existing theoretical models.

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