论文部分内容阅读
依据中国大陆科学钻探 (CCSD)两口先导孔中地热测量和岩石样品热物性参数 ,对 5 0 0 0m深钻的可能钻遇温度进行了预测 .先导孔中地温梯度介于 1 9— 2 6℃ /km ;岩石热导率变化为 2 .6 4— 8.81W/(m·K) ,平均 (3 .94± 1 .2 6 )W/(m·K) ;实测热流值为 76— 80mW/m2 ;3 0块岩石样品放射性生热率变化为 (0 .0 9— 2 .1 7) μW/m3,45 0m深度以上层平均 (0 .76± 0 .5 ) μW/m3,以下层段平均 (0 .48± 0 .2 ) μW/m3,生热率随深度递减 ,但变化趋势难以明确判定 .分别对热流和热导率取上、下限 ,采用不同的生热率随深度的分布函数 ,区分考虑或不考虑热导率的温度相关性 ,分别计算出 5 0 0 0m深度内可能的温度分布剖面 .计算结果表明 ,超深井于 5 0 0 0m垂直深度上的温度将达到 1 1 0— 1 40℃ ,2 0 0 0m深度的探井钻遇温度将介于 5 4— 6 4℃ .此外 ,考虑热导率的温度效应后预测的温度一般高于未考虑热导率温度效应 5— 8℃ .
Based on the geothermal measurements and petrophysical parameters of the two pilot holes in the China Science Drilling (CCSD), the probable temperature of the 5 000 m deep drilling was predicted, and the geothermal gradient in the pilot bore was between 19 and 26 ° C / km; the thermal conductivity of the rock varied from 2.6 to 8.81 W / (m · K), with an average of (3.94 ± 1.26) W / (m · K); the measured heat flow was 76-80 mW / m2. The variation of radioactive heat rate of 30 rock samples was (0. 09-2. 17) μW / m3, and the depth of the upper layer was (0 .76 ± 0 .5) μW / Average (0 .48 ± 0 .2) μW / m3, the rate of heat generation decreases with depth, but the trend of change is hard to be determined clearly.We respectively take upper and lower limits of heat flux and thermal conductivity, and adopt different heat rate distribution with depth Function to distinguish or not consider the temperature dependence of thermal conductivity and calculate the possible temperature distribution profiles within the depth of 500m.The calculated results show that the temperature of the ultra-deep well at a vertical depth of 500m will reach 11 The drilling temperature at 0-40 ° C and 2000 ° depth will be 5-46 ° C and the predicted temperature after considering the thermal effect of thermal conductivity is generally higher than that without thermal conductivity Effect 5- 8 ℃.