中国大陆科学钻探主孔动态地温测量  

Temperature measurement in the main hole of the Chinese Continental Scientific Drilling

作　　者：何丽娟[1] 胡圣标[1] 杨文采[2] 汪集旸[1] 杨树春[1] 袁玉松[1] 程振炎[2] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]中国地质科学院地质研究所,北京100037

出　　处：《地球物理学报》2006年第3期745-752,共8页Chinese Journal of Geophysics

基　　金：国家重大基础科研973项目(2003CB716505)资助

摘　　要：介绍了大陆科学钻探主孔完钻后4次的钻井测温数据,地温梯度随深度的变化趋势,系统的热导率测试结果及其温压校正.地温测量显示,浅部（100m以上）的4次测量结果有较大的区别,而100m以下测量温度趋于一致.在900～1600m井段,温度略有波动,可能存在地下水活动.到了深部,温度与深度呈现良好的线性关系.在0～500m,500～2700m,2700～3600m及3600m以下这4个井段范围内,地温梯度随深度降低或增加的趋势交替变化,平均地温梯度24.8±3.4℃/km.198块岩芯样品测试结果表明,热导率变化范围在1.711～3.6 W/（m·K）,平均2.716±0.403 W/（m·K）.依据实测的温度-深度进行温压校正后,热导率为1.989～3.652 W/（m·K）,平均2.808±0.363 W/（m·K）.热导率随深度的变化趋势与地温梯度的变化趋势并不能完全相互补偿,表明影响地温梯度的其他因素不容忽视.大陆科学钻探温度测量,为今后进一步研究超高压变质带深部地热场及其地球动力学含义提供了可靠的基础数据.This paper presents the temperature measurements in the main hole of Chinese Continental Scientific Drilling, the variation trend of temperature gradient with depth, and systemic thermal conductivity data together with the temperature-pressure correction. Four temperature profiles indicate that the measured temperatures in four times show great differences in the shallow depth （above 100m）, but tend to be consistent downward. However, between 900 - 1600m, the temperatures show fluctuation again, possibly due to effects of groundwater activities. The deeper temperature in the borehole shows quite good linear relationship with the depth. In four depth ranges, 0 - 500m, 500 - 2700m, 2700 - 3600m, and below 3600m, the temperature gradient increases or decreases alternatively, with a mean of 24.8 ± 3.4℃/km. The thermal conductivities based on 198 core samples range from 1.711 to 3.6 W/（m·K）, with an average of 2.716 ± 0.403 W/（m·K）. After temperaturepressure correction, the thermal conductivities range between 1.989 and 3.652 W/（m· K）, with a mean of 2.808 ± 0.363 W/（m·K）. The variation of thermal conductivity with depth could not compensate the variation of temperature gradient, indicating that other factors influencing temperature gradient could not be neglected. Temperature measurements and its long-period observation will provide reliable basic data for geothermal and geodynamical study of the ultra-high pressure metamorphic belt.

关 键 词：中国大陆科学钻探主孔 地温测量 地温梯度 热导率 

分 类 号：P314[天文地球—固体地球物理学]