川滇地区4个地温钻孔监测数据分析

Analysis of Deep Ground Temperature Monitoring in Sichuan-Yunnan Region

通过分析川滇地区4个浅层地温观测台站(宾川台、丽江台、腾冲台和五龙台)的地温日连续资料表明,太阳辐射的年周期影响随着地下深度的增加逐渐减弱,在地下14m深度,太阳辐射年周期的影响已经基本消失,与理论计算存在一定差异,可能与台站地下介质特性及川滇地区普遍发育的热泉有关。太阳辐射的波峰随深度呈指数衰减,波谷随深度呈对数增加,在14m深度处,太阳辐射的波峰波谷影响基本消失。通过牛顿迭代法反演不同深度的热扩散系数,结果显示,宾川、丽江、腾冲3个台站热扩散系数随深度增加而增大;五龙台从4m以下深度开始,其热扩散系数随深度增加而增大。虽然4个地温台站的热扩散系数随深度增加的变化幅度不同,但基本都呈指数函数变化规律。

From September to November of 2014,we laid out four deep geothermal stations near the Sichuan-Yunnan fault zones(Binchuan,Lijiang,Tengchong and Wulong).The results show that the annual cycle effect of solar radiation decreases with the increase of underground depth,and the influence of the annual activity of solar radiation basically disappears at 14m and there is a difference with theoretical calculation,which may be related to the characteristics of underground media and widely developed hot springs in Sichuan-Yunnan region.The peak of solar radiation decays exponentially with depth,and the trough increases logarithmically with depth.At the depth of 14 m,the tidal wave valley of the solar radiation basically disappears.The thermal diffusivity of different depths is retrieved by Newton iteration,and the results show that the thermal diffusivities increase with depth in Binchuan,Lijiang and Tengchong,and the thermal diffusivity of Wulong increases with depths below 4 meters.Although the range of variation is different,it basically assumes exponential function.