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In this paper, experiments are carried out under different pressures and water saturations using core samples of
volcanic rocks from the Junggar Basin in China to understand how water saturation affects P- and S-wave velocities. The
results show that water saturated rocks exhibit significantly higher P- and S-wave velocities than gas saturated rocks. In
addition, the P- and S-wave velocity ratio declines with increasing water saturation. Furthermore, a P- and S-wave velocity
ratio vs. resistivity cross plot is created to identify gas reservoirs in the volcanic rocks in the Junggar Basin.