音频大地电磁法在地热勘查中的应用——以福建省宁化县黄泥桥地区为例  

The application of audio frequency magnetotelluric method to the geothermal exploration:A case study of Huangniqiao area, Ninghua County, Fujian Province

作　　者：王佳龙 邸兵叶[1] 张宝松[1] 赵东东 WANG Jia-Long;DI Bing-Ye;ZHANG Bao-Song;ZHAO Dong-Dong(Nanjing Center,China Geological Survey,Nanjing 210016,China)

机构地区：[1]中国地质调查局南京地质调查中心,江苏南京210016

出　　处：《物探与化探》2021年第3期576-582,共7页Geophysical and Geochemical Exploration

摘　　要：为查明福建省三明市宁化县黄泥桥地区地热资源赋存情况,利用音频大地电磁法(AMT)在该区开展地热勘查工作,通过分析工区内地层结构、岩性特征,推断了区内断裂构造分布,根据断裂展布特征圈定了1处优选地热异常靶区,经钻探验证,井孔含水地层与AMT二维反演低阻异常吻合较好。在验证基础上,构建了区内断裂空间分布模型,并根据AMT反演结果和断裂展布特征推断了4处潜在断裂型热储区。In order to find out the occurrence status of geothermal resources in Huangniqiao area, Ninghua County, Sanming City, Fujian Province, the authors carried out geothermal exploration work in this area by using the audio frequency magnetotelluric method(AMT). Based on the analysis of the characteristics of layer structure and lithology in the work area, the fault structure distribution in the area was inferred and, according to the fault distribution characteristics, one optimized geothermal abnormal target area was delineated. Drilling shows that the well bore water-bearing formation is in good agreement with the low resistivity anomaly of AMT two-dimensional inversion. On the basis of verification, the spatial distribution model of faults in the area was constructed, and four potential fault type thermal storage areas were inferred according to AMT inversion results and fault distribution characteristics. The overall research results show that AMT method is feasible and effective for geothermal resource exploration, which can provide important reference value for the deployment of geothermal exploration in similar areas in the future.

关 键 词：地热勘查 音频大地电磁测深 断裂构造 热储区 

分 类 号：P631[天文地球—地质矿产勘探]