分布式温度感测技术在金坛地区地层导热性能评价中的应用

为了确定常州市金坛地区地下热物性系数,为浅层地热能的开发提供理论依据,基于线热源理论将分布式温度感测技术(distributed temperature sensing,DTS)与现场热响应技术(thermal response test,TRT)相结合,利用分布式热响应试验(dis-tributed thermal response test,DTRT)及主动加热光纤的热响应试验(active heating optical fiber thermal response test,ATRT),对该地区不同深度地层的导热系数进行了监测计算和分析评价,并比较了不同技术的监测结果.试验结果表明:基于DTS技术的DTRT相比于传统TRT,可以实现各土层导热系数的分布式测试;ATRT计算得出的各层导热系数分布趋势与DTRT趋势大体相同,证明了将ATRT应用到导热系数的测试中的可行性.并且,相比TRT和DTRT,ATRT耗时更短耗能更低的优势,这也使得ATRT技术在地温场监测中具有较大的潜力.

Application of DTS technology in evaluation of formation thermal conductivity in Jintan area

In order to determine the coefficient of the underground thermal physical properties of jintan, changzhou, and to provide theoretical basis for the development of shallow geothermal energy, distributed thermal response test (DTRT) and active heating optical fiber thermal response test (ATRT) were used to monitor and evaluate the thermal conductivities of strata at different depths in this area, and then monitoring results of different technologies were compared. The experimental results show that compared with traditional TRT, DTRT based on DTS technology can realize the distributed measurement of thermal conductivity of all soil layers. Moreover, ATRT, which can also obtain relatively reliable thermal conductivity, takes less time and consumes less energy compared with TRT and DTRT, showing a great potential in ground temperature monitoring.