Influence of frequency and fluid distribution on elastic wave velocities in partially saturated limestones

1995 ◽  
Vol 100 (B6) ◽  
pp. 9789-9803 ◽  
Author(s):  
T. Cadoret ◽  
D. Marion ◽  
B. Zinszner
Keyword(s):  
Elastic Wave ◽  
Fluid Distribution ◽  
Partially Saturated ◽  
Wave Velocities

Elastic wave velocities during evaporative drying

Geophysics ◽  
1998 ◽  
Vol 63 (1) ◽  
pp. 171-183 ◽  
Author(s):  
David Goertz ◽  
Rosemary Knight
Keyword(s):  
Elastic Wave ◽  
Pore Space ◽  
Fluid Distribution ◽  
Drying Process ◽  
Shear Moduli ◽  
Velocity Saturation ◽  
Wave Velocities ◽  
Three Samples ◽  
Rate Period ◽  
Drying Rates

Laboratory measurements of drying rates and elastic wave velocities are made on limestone, dolomite, and sandstone samples during evaporative drying. The drying rate data are very similar in form. There is a constant rate period at higher saturations and a falling rate period below saturation levels of approximately 0.2. The falling rate period marks the transition in the sample from hydraulically connected to disconnected water. There is a strong link between elastic wave velocities and the drying process because different pore geometries drain at different stages in drying. The drainage of these different geometries results in specific changes in the moduli and velocities. Simple models of the pore geometries and the drying process are used to model the velocity data. The velocity‐saturation relationship for each of the three samples is very different in form because of differences in pore‐space microgeometry. Of particular interest is the velocity response during the falling rate period of drying. In the limestone and the sandstone, there is a significant decrease in bulk and shear moduli and elastic wave velocities because of the drainage of crack‐like pores and grain contacts. In contrast, the absence of these pore geometries in the dolomite results in essentially no changes in the moduli at low saturations. An understanding of the drying process and resulting pore‐scale fluid distribution provides useful insights into the observed form of the velocity‐saturation relationship.

Elastic Wave Velocities in Partially Saturated Ottawa Sand

2000 ◽  
Vol 64 (4) ◽  
pp. 1226-1234 ◽  
Author(s):  
Doru Velea ◽  
F.Douglas Shields ◽  
James M. Sabatier
Keyword(s):  
Elastic Wave ◽  
Ottawa Sand ◽  
Partially Saturated ◽  
Wave Velocities

Elastic wave velocities in partially saturated rocks: Saturation hysteresis

1996 ◽  
Vol 101 (B1) ◽  
pp. 837-844 ◽  
Author(s):  
Mickaële Le Ravalec ◽  
Yves Guéguen ◽  
Tamaz Chelidze
Keyword(s):  
Elastic Wave ◽  
Partially Saturated ◽  
Wave Velocities

Assessing rock brittleness and fracability from radial variation of elastic wave velocities from borehole acoustic logging

2016 ◽  
Vol 64 (4) ◽  
pp. 958-966 ◽  
Author(s):  
Xiao-Ming Tang ◽  
Song Xu ◽  
Chun-Xi Zhuang ◽  
Yuan-Da Su ◽  
Xue-Lian Chen
Keyword(s):  
Elastic Wave ◽  
Radial Variation ◽  
Acoustic Logging ◽  
Wave Velocities ◽  
Rock Brittleness

Elastic Wave Velocities in Laminated Media

1954 ◽  
Vol 26 (5) ◽  
pp. 949-949
Author(s):  
J. E. White ◽  
F. A. Angona
Keyword(s):  
Elastic Wave ◽  
Wave Velocities
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