An Experimental Study of Velocity-Saturation Relationships in Volcanic Rocks

Zhidi Liu*, Jingzhou Zhao
School of Earth Sciences and Engineering, Xi’an Shiyou University, Xi’an, China.

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© 2015 Liu et al.;

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Correspondence: * Address correspondence to this author at the School of Earth Sciences and Engineering, Xi’an Shiyou University, Xi’an, China; Tel: +0086-15529269858; E-mail:


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.

Keywords: Gas recognition, P-wave and S-wave velocity, volcanic rock, water saturation.