RESEARCH ARTICLE


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: https://creativecommons.org/licenses/by/4.0/legalcode. 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: liuzhidi@xsyu.edu.cn


Abstract

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.