本文選題：溫度 + 熱導率��； 參考：《海洋地質與第四紀地質》2016年02期

【摘要】：溫度對巖石熱導率的影響是一個重要的地熱學研究課題。在前人巖石熱導率實驗的基礎上,結合南海西南海次盆地殼實際資料,用數(shù)值模擬的方法,對倒數(shù)型、直線型和指數(shù)型熱導率-溫度模型系數(shù)進行了約束,并對溫度對熱導率影響條件下莫霍面深度的求解方法以及海底熱流與莫霍面溫度關系的探討產(chǎn)生了新的認識。計算結果表明:倒數(shù)型(K(T)=a+b/(T+c),a、b、c為常數(shù))和直線型(K(T)=a·T+b,a、b為常數(shù))熱導率-溫度模型系數(shù)呈線性相關,指數(shù)型(K(T)=a·ebT,a、b為常數(shù))則更符合二次多項式形式,據(jù)此可簡化熱導率-溫度表達式系數(shù)個數(shù),使巖石熱導率與溫度之間的定量化描述更進一步。根據(jù)模擬結果與實驗室統(tǒng)計結果對比分析得到西南次海盆莫霍面深度為14~16km。通過熱導率-溫度模型系數(shù)反演發(fā)現(xiàn),熱導率受溫度影響時海底熱流值同莫霍面溫度呈正相關,當海底熱流為100~125mW/m2、莫霍面深度為10.3km時,西南次海盆莫霍面溫度為420~540℃,且隨莫霍面深度增加而升高,當莫霍面深度增至14~16km時則可達600~1 000℃。
[Abstract]:The influence of temperature on the thermal conductivity of rock is an important subject of geothermal research. On the basis of previous rock thermal conductivity experiments and combined with the actual data of the southwest sea basin in the South China Sea, the coefficients of reciprocal, linear and exponential thermal conductivity-temperature models are restricted by numerical simulation. A new understanding of the solution of Moho surface depth under the influence of temperature on thermal conductivity and the relationship between submarine heat flux and Moho surface temperature is also given. The results show that the reciprocal type (K (T) a b / (T c) is a constant) and the linear type (K (T) a T BBA B are constant) the coefficient of the temperature model is linearly correlated, and the exponential type (K (T) a ebTab is a constant) is more in accordance with the quadratic polynomial form. Based on this, the number of thermal conductivity-temperature expression coefficients can be simplified, and the quantitative description between thermal conductivity and temperature of rock can be further improved. According to the comparison and analysis between the simulation results and the statistical results of the laboratory, the depth of the Moho surface of the southwest subbasin is 14 ~ 16km. From the inversion of the coefficient of thermal conductivity-temperature model, it is found that the submarine heat flux is positively correlated with the Moho surface temperature when the thermal conductivity is affected by temperature. When the undersea heat flux is 100 ~ 125mW / m ~ (2) and the Moho depth is 10.3km, the Moho surface temperature of the southwest subbasin is 420 ~ 540 鈩，

本文編號：2107996