COMPRESSIONAL AND SHEAR-WAVES IN SATURATED ROCK DURING WATER-STEAM TRANSITION

被引:99
作者
ITO, H
DEVILBISS, J
NUR, A
机构
来源
JOURNAL OF GEOPHYSICAL RESEARCH | 1979年 / 84卷 / NB9期
关键词
D O I
10.1029/JB084iB09p04731
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Compressional and shear wave velocities were measured in water-filled Berea sandstone as a function of pore pressure, with a constant confining pressure of 300 bars. The measurements were made at room temperature, 145oC, and 198oC. At 145oC, compressional velocity increased from vapor-saturated (low pore pressure) to liquid-saturated (high pore pressure) conditions, whereas shear wave velocity decreased. For compressional waves there was a velocity minimum and increased attenuation near the liquid-vapor transition. The results at 198oC show decreases of both compressional and shear velocities and a small velocity minimum for compressional velocity without marked attenuation. At both temperatures, Vp/Vs and Poisson's ratios increased from stream- to water-saturated rock. The results are compatible with the mechanical effects of mixing steam and water in the pore space near the phase transition and may be applicable to situ geothermal field evaluation. -Authors
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页码:4731 / 4735
页数:5
相关论文
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