The Open Petroleum Engineering Journal

2015, 8 : 142-152
Published online 2015 March 31. DOI: 10.2174/1874834101508010142
Publisher ID: TOPEJ-8-142

An Experimental Study of Velocity-Saturation Relationships in Volcanic Rocks

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

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.