MT法在河北献县地区地热勘查中的应用

河北献县地热资源埋藏浅、温度高、储量大、开发潜力大，合理选择物探方法可以很好地确定靶区，圈定储热构造，减少因钻探位置不当带来的额外开发成本.本次勘查工作利用EH4连续电导率成像系统，采取单点进行大地电磁测深（MT）的数据采集方式，能够极大地降低地形因素的影响，由此保证了测量的精度.由于MT法探测深度的优势，其反演电阻率电性特征图能够很清晰地反映出地热田导水导热断裂构造的分布、产状.MT法在本次地下热源勘查工作中取得了很好的测量结果，成功圈定了地下热源的范围，为下一步的钻探工作提供了有力的技术支持.

APPLICATION OF MT METHOD IN GEOTHERMAL PROSPECTING IN XIANXIAN AREA,HEBEI PROVINCE

The geothermal resources in Xianxian area of Hebei Province is characterized by shallow burying, high temperature and large reserves with great exploration potential. Appropriate geophysical prospecting methods can better delineate the target for reservoir structure, therefore reduce extra cost caused by improper drilling position. The EH4 continuous conductivity imaging system is used in the exploration, with the single-point measurement to collect the data of magnetotelluric sounding (MT), which greatly reduces the influence of topographic factors, thus ensure the measuring accuracy. Due to the advantages in detecting depth, the resistivity inversion result of MT method can clearly reflect the distribution and occurrence of water-and heat-conducting faults in geothermal field. The MT method achieves good results in the exploration of underground heat source, and provides a technical support for further drilling as well.