利用超高压变质岩的P波速度估算地下岩石的热导率

欧新功; 金振民; 夏斌; 徐海军; 金淑燕

Volume 31 Issue 4

Jul. 2006

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Article Navigation > Earth Science > 2006 > 31(4): 564-568

OU Xin-gong, JIN Zhen-min, XIA Bin, XU Hai-jun, JIN Shu-yan, 2006. Prediction of Thermal Conductivity of Underground Rocks from P-Wave Velocity of Ultrahigh-Pressure Metamorphic Rocks. Earth Science, 31(4): 564-568.

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Prediction of Thermal Conductivity of Underground Rocks from P-Wave Velocity of Ultrahigh-Pressure Metamorphic Rocks

1.
Guangzhou Institute of Geochemistry, Key Laboratory of Marginal Sea Geology, Chinese Academy of Sciences, Guangzhou 510640, China
2.
State Key Laboratory of Geological Processes and Mineral Resources(GPMR), China University of Geosciences, Wuhan 430074.China

Received Date: 2006-03-05
Publish Date: 2006-07-25

Abstract

Abstract

The relationship between thermal conductivity and ultrasonic velocity has been analyzed by using 655 samples from scientific boreholes drilled in Donghai, eastern China. The samples are classified into 4 different types: fresh eclogite, retrograde eclogite, orthogneiss and paragneiss. We established equations that enabled us to predict thermal conductivity from measuring the P-wave velocity of each type of rock. The regression analysis of thermal conductivity vs. ultrasonic velocity yields a correlation coefficient of about 0.7 for eclogite and 0.5-0.4 for gneiss. The result shows that the linear equation is sufficient to describe the relationship between thermal conductivity and ultrasonic velocity. For verifying these equations, we chose several typical lithology units of the CCSD mainhole to estimate thermal conductivity from P-wave velocity. The calculated values are consistent with the measured average value of thermal conductivity, which means these equations can be used to infer thermal conductivity for underground rocks through P-wave velocity in the Donghai region or similar area. These results are of great significance for thermal conductivity selection in thermal structure analysis or heat flow calculations.
- thermal conductivity,
- P-wave velocity,
- regression analysis,
- ultrahigh-pressure metamorphic rocks

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References

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