探找热水的有效方法——以EH-4电导率成像系统在西藏尼玛县找热水为例

Effective method for exploring hot water-For example EH4 conductivity imaging system finding hot water in Nima county of Tibet

EH-4电导率成像系统在西藏尼玛县探找热水中得到成功应用,充分体现了该成像仪的诸多优点,同时也反映出所测数据的整理、分析和合理解译是整个测试过程中十分关键的环节;在现场操作中要充分考虑近场源信号干扰、地形修正及线路、电极的导通与接地.在前次采用激电法探测的基础上,利用EH-4电导率成像系统进行了加密、补测,从而对热储进行了圈闭,并对两种测试方法及已经施工的验证钻孔,根据测区内地质体、水及热水具有不同视电阻率的特性,进行了有效的分析、对比,最后综合了两种方法的测试成果,为下一步寻找、开发利用热水资源提供可靠依据.本文就是通过找热水这一实例来揭示EH-4电导率成像系统在实际应用中的作用和意义,同时也为以后开展类似工作积累一点实践经验.

EH-4 conductivity imaging system exploration has been successfully applied to find hot water in Nima county of Tibet, which does＇nt only show the advantages of the detector, but also reflects the collation , analysis and rational interpretation of the measured data is importent links in the all testing process. The interference of near-field signal and topography,correction of cables and electrode conduction, grounding are taken into account operation in the field. In the use of IP based on the detecting area is encrypted, supplemented by the use of EH-4 conductivity imaging system and thus thermal energy storage for a trap. The two kinds of testing methods and the construction drilling are carried out an effective analysis, comparison according to geologic bodies, water and hot water in survey area have different characteristics of apparent resistivity . A reliable basis is provided for the next search, development and utilization of hot water . This article reveals the practical significance and application by this instance of the EH-4 electromagnetic detection system looking for hot water, but also accumulates practical experience to carry out similar work in the future.