Comparative study on forward simulation of controllable source audio magnetotelluric method and electrical source transient electromagnetic method in Bachu area
With the development of social economy,various kinds power transmission line networks distribute all over the country,which has caused serious interference to electromagnetic method detection.Even if natural source electromagnetic method detection is carried out in remote areas such as the Gobi Desert in the Tarim Basin,it has also been greatly affected.Therefore,artificial source electromagnetic method needs to be used for detection to improve the signal noise ratio,so as to obtain accurate underground geological structure in the study area.The controllable source audio frequency magnetotelluric method in the frequency domain electromagnetic method and the electrical source transient electromagnetic method in the time domain transient electromagnetic method were studied in this paper with forward modeling the geoelectric structure in Bachu uplift area of the Tarim Basin.The results showed that in the geoelectric structure with low resistivity characteristics of sandstone type uranium deposits in Bachu uplift area of Tarim Basin,the controllable source audio frequency magnetotelluric method and electrical source transient electromagnetic method in the artificial source electromagnetic method can effectively detect the target sand body with a certain thickness,but in the geological structure of slope zone,the CSAMT near source phenomenon was still serious even with the large transceiver distance,which greatly affected the exploration accuracy for the geological structure of deep basement,but the electrical source transient electromagnetic method was not interfered and can accurately reflect the characteristics of the shallow and deep geoelectric structure.At the same time,the electrical source transient electromagnetic method had a large abnormal response to the target sand body and the ability to distinguish the overall stratigraphic structure.Therefore,based on the forward modeling results and comparative analysis of the two artificial source electromagnetic methods,the detection effect of the electrical source transient electromagnetic method will be relatively good for the uranium metallogenic environment with low resistivity characteristics in the Tarim basin.
TEMforward simulationsandstone type uranium deposit
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