Characterization of rock wettability through dielectric measurements

The wettability of glass filters and Berea sandstone was investigated using the electric response in the interval 10(2)-10(8) Hz. The natural wettabil ity of the materials was modified to get two different sets of samples, one with strong water and the other with strong oil wettability. The samples w ere saturated to various degrees up to 40% with deionized water or brine. M easurements showed that the electric responses of water-wet and oil-wet sam ples were markedly different and more complex than those predicted by two s tandard models. The dispersivity and the loss tangent were found to be the most suitable parameters to check the wettability of the samples.