Several researchers have documented a consistent trend in the variation of resistivity of organicrich mudrock reservoirs with thermal maturity (Kreis and Costa 2006; Cumella and Duhailan 2014). For example, in the Niobrara Formation the resistivity of the shale reservoir in low thermal maturity, in the oil generation stage is low at about 20 Ωm; the resistivity then gradually increases to nearly 100 Ωm at wet gas stage. However, the resistivity trend reverses and drops to around 40 Ωm at even higher thermal maturity at dry gas stage (Cumella and Duhailan 2014). In other highly mature shale-gas reservoirs, the overall electrical resistivity has been found to be 1-2 orders of magnitude less than the measured electrical resistivity in the same formation at relatively lower thermal maturities ). The low resistivity phenomenon is attributed to graphitization of kerogen at high thermal maturities, presence of conductive minerals, clay content, etc. however, distribution of fluids in the pore spaces have significant impact on the resistivity measurements . Therefore, it is critical to understand the factors influencing the wettability of organic-rich mudrocks.