Prediction of Thermal Conductivity of Underground Rocks from P-Wave Velocity of Ultrahigh-Pressure Metamorphic Rocks
Prediction of Thermal Conductivity of Underground Rocks from P-Wave Velocity of Ultrahigh-Pressure Metamorphic Rocks
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发表时间：
2006
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通讯作者：
OU Xin-gong
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作者：
OU Xin-gong
利用东海科学钻孔655个样品，分析了热导率与超声速度的关系。样品分为新鲜榴辉岩、逆行榴辉岩、正长榴辉岩和副长榴辉岩4种类型。我们建立了方程，使我们能够通过测量每种岩石的纵波速度来预测热导率。热导率与超声波速度的回归分析表明，榴辉岩的相关系数约为0.7，片麻岩的相关系数为0.5-0.4。结果表明，用线性方程可以很好地描述超声声速与导热系数之间的关系。为了验证这些方程，我们选择了CCSD主孔的几个典型岩性单元，从纵波速度估计热导率。计算值与实测平均导热系数基本一致，说明该方程可用于东海地区或类似地区的纵波速度推断地下岩石导热系数。这些结果对热结构分析或热流计算中的导热系数选择具有重要意义。
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.