In bitumen bearing oil sands or heavy oil, you can add the deep resistivity method for calculating shale volume. The purpose is to eliminate small Vsh anomalies caused by feldspar or uranium salts in the reservoir. The method works best with Phasor or Array Induction and High Res Laterologs, but may also be helpful in SAGD projects with olde logs.
1: Vshr = (log(RESD) - log(RMAX)) / (log(RSH) - log(RMAX))
DOES NOT work in water zones so combine this methhod with any other feasible model to handle the water zones.
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