关键词: 瞬变电磁测深, 电阻率, 构造

Abstract: The paper presents the trial method and results with Long-offset & window Transient Electromagnetic Method (LoTEM) to investigate detailed geological structure in the area covered with carbonatite. We chose a well known local structure in Sangzhi Shimen synclinorium, Siwang mountain structure whose area is about 200 km²,to test the LoTEM. The rugged topography area is covered with carbonatite, and the surface geological condition gives priority to the complicated structure. The resistivity of the surface carbonatite is greater than 500Ω·m, and the target layer is Silurian marlite with resistivity value about 10Ω·m, and its buried depth is one to two kilometers. These give the better geophysical preconditions to the working area. Two sources were setup in the field. We finished eight lines with total 212 geophysical sites. The grid was arranged with equality (2km×0.5km).Althought there is strong cultural noise in the area, LoTEM features good anti disturbance. The rate of higher quality data is more than 80%. The EMF curve is credible before 1s and it guaranteed the data quality for interpretation. Through data processing and inversion, resistivity versus depth profiles of eight lines were obtained, and they have good coherence with the seismic profile. The results show that LoTEM can be used in prospecting for detailed structure in complicated areas.

Key words: Transient electromagnetic method, Resistivity, Structure