A quant itative method for measuring the wet tahility of porous media containing brine and crude oil has been developed by the USBM using C@il/CZ?yp TeSSUIE?

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The calculation ofin-situ water saturations from resistivity well logs relies on the saturation exponent of Archie's equation, where n =2 for clean, consolidated, water-wet sandstones. The saturation exponent, however, is a function of the water/oil/rock wettability and was found to range from <2 to 8. The relationship between wettability and the saturation exponent is linear, and the slopes of the lines at low and high temperature are identical for a given sandstone.

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