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.
王佳龙, 邸兵叶, 张宝松, 赵东东. 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[J]. 物探与化探, 2021, 45(3): 576-582.
WANG Jia-Long, DI Bing-Ye, ZHANG Bao-Song, ZHAO Dong-Dong. The application of audio frequency magnetotelluric method to the geothermal exploration: A case study of Huangniqiao area, Ninghua County, Fujian Province. Geophysical and Geochemical Exploration, 2021, 45(3): 576-582.
Wu B, Cao J X, Zou J, et al. Application of audio frequency magnetotelluric sounding method in the study of geothermal exploration of small hot water in Kangding[J]. Geophysical and Geochemical Exploration Calculation Technology, 2011, 33(5):507-510.
Cao Y A, Jiang H H. The application of comprehensive geophysical method in the geothermal exploration of the periphery of a geothermal field in Anshan City[J]. Geological Prospecting Cluster, 2013, 28(1):153-157.
Sun H C, Liu Y L, Shao C L. Application of comprehensive geophysical exploration to geothermal exploration in Haishiwan area[J]. Geophysical and Geochemical Exploration Calculation Technology, 2019, 43(2):290-297.
Zhao B F, Wang Q N, Guan D W. Geophysical field characteristics of zonal thermal storage geothermal field:A case study of hot water Wei geothermal field in Hunan Province[J]. Geophysical and Geochemical Exploration, 2019, 43(4):734-740.
Ye Y X, Deng J Z, Fang G X. Experimental study of high frequency magnetotelluric sounding (EH-4) in the exploration of thermal reservoir structure — Taking Fuzhou geothermal area as an example[J]. Geology and Exploration, 2011, 47(4):649-653.
Wang J L, Zhang B S, Chen J W, et al. Comparison of application effects of different inversion methods of magnetotelluric sounding — a case study of shale gas survey in Anhui Wanjiang area[J]. Geology of East China, 2020, 41(1):79-87.
Lin Z L, Zhang H L. Investigation report of huangniqiao geothermal anomaly area, Nanxiang, Ninghua County,Sanming City [R]. Sanming:resource and environment investigation and Research Institute of Minxi Geological Brigade, Fujian Province, 2016.
Wang B, Li B X, Li F C. The application of geophysical exploration results in the study of the segmented difference of thermal and seismic control in the Elashan active fault zone, Qinghai[J]. Geophysical and Geochemical Exploration, 2015, 39(2):311-317.
Chen X B, Ye T, Cai J T, et al. Research on fine processing of magnetotelluric data and two-dimensional inversion and interpretation technology (7)—deep electrical structure and seismogenic environment in Yingjiang Longling seismic area, Yunnan[J]. Journal of Geophysics, 2019, 62(4):1377-1393.