When conventional sonic log analyses are applied to Vugular carbonates, the calculated porosities are often greatly in error. To study this problem, the travel time of vugular cores were measured for samples from four wells. This laboratory data shows a linear relation between porosity and travel time, but the so called fluid velocity term is larger than that normally used. Thus conventional analysis yields too low a porosity. As an alternative, an exponential equation is presented which uses a reasonable fluid velocity.

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