论文部分内容阅读
从地下水温度角度探讨内蒙古乌拉特前旗西山咀隐伏断裂存在的可能性。通过对钻孔含水岩土的比热、导热系数、导温系数等理论参数及地下水温度场的计算,得出在仅受气温影响时地下水温度振幅与深度(理论深度,Hc)的关系;通过对西山咀地区变温层内浅层地下水进行温度测量,拟合出地下水温度振幅与深度(拟合深度,Hf)的关系。温度振幅相同时,将二者进行比较,Hf较小,说明地下水温度不仅受气温的影响,还受地下热源的控制;从恒温层角度分析,温度振幅为0.045℃(温度变化<0.1℃)时,可视为恒温层的起始深度,此处温度较区域背景值(即多年平均气温)高,也说明该地区变温层内地下水温度不仅受气温的影响,还受地下热源的控制。而该地区属于中低温热储型沉积盆地,地下热源通过热通道对浅层地下水产生影响,根据地热系统要素,这种通道只能是研究区地层中的断裂系统。而该地区地质剖面表明,该断裂在地表并未产生错层,因此研究区存在隐伏于地面以下的断裂。
Discussion on the Possibility of Concealed Fault of Xishanzui in Wulateqianqi, Inner Mongolia from the Angle of Groundwater Temperature. The relationship between groundwater temperature amplitude and depth (theoretical depth, Hc) is obtained through the calculation of the theoretical parameters such as specific heat, thermal conductivity and thermal conductivity, and the temperature field of groundwater under the influence of air temperature only. The temperature of shallow groundwater in the temperature-changing layer in Xishanzui area was measured and the relationship between groundwater temperature amplitude and depth (depth of fit, Hf) was fitted. When the temperature amplitude is the same, the two are compared and Hf is small, which shows that the groundwater temperature is not only affected by the temperature but also controlled by the underground heat source. From the perspective of the thermostat, when the temperature amplitude is 0.045 ℃ (temperature change <0.1 ℃) , Which can be regarded as the initial depth of the thermostatic layer, where the temperature is higher than the background value of the area (ie, the mean annual temperature), indicating that the groundwater temperature in the geothermal layer in this area is not only affected by the temperature but also controlled by underground heat sources. The area belongs to medium- and low-temperature thermal reservoir-type sedimentary basins, and underground heat sources influence the shallow groundwater through hot aisles. According to geothermal system elements, this channel can only be a fracture system in the strata of the study area. However, the geological profile of the area shows that there is no fault layer on the surface of the fault, so there is a fault hidden below the ground in the study area.