We have measured the velocity of sound in a sandstone saturated with oil and brine at different concentrations. The velocity variations with the concentration depend drastically on the way of entering the fluids in the sample : injection of non‐wetting fluid in a sandstone fully saturated with a totally wetting fluid (drainage) or vice versa (imbibition). We interpret our measurements with an extension of the Biot‐Gassmann theory to a wetted frame of the sandstone saturated with an effective oil‐brine fluid.
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Bacri et al. (1986) studied this question.