COMPRESSIONAL VELOCITIES OF PARTIALLY SATURATED, UNCONSOLIDATED SANDS

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Abstract
The possibilities inherent in reflection amplitude anomalies or “bright spots” on seismic cross‐sections as indications of gaseous hydrocarbons have stimulated widespread interest. To help evaluate these possibilities, laboratory measurements were made on specimens of compacted Ottawa sand of approximately 30 percent porosity. The measurements were made at five different water saturations (0 percent and 100 percent, and approximately 9 percent, 45 percent, and 85 percent) and net confining pressures to 10,000 psi. The gas was air. Measurements were made with acoustic pulses with a peak frequency of about 700 khz.

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