用电勘探方法探测低对比度物体

IF 2.2 3区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of Applied Geophysics Pub Date : 2024-08-21 DOI:10.1016/j.jappgeo.2024.105492
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引用次数: 0

摘要

许多地质问题无法通过电法勘探来解决。其原因通常是目标物体的电阻率与主介质的电阻率略有不同。同时,使用横向磁场(TM)可以识别低对比度物体,并高精度地划定其边界。TM 型探矿效率更高,因为其信号受电阻率和其他电动参数变化的影响更大。文章探讨了其中一个困难的案例--在雅库特寻找金伯利岩管。就水平电阻率而言,这些物体与主介质的差别很小。在雅库特寻找金伯利岩管的勘探工作采用传统的电法勘探方法,存在许多问题。文章介绍了成功的 TM 型探矿实地勘测结果,在这些勘测中,金伯利岩管非常突出。文章还介绍了一种更为复杂情况的建模结果,在这种情况下,金伯利岩管位于 140 多米深的地方,并被捕集层覆盖;该地区有许多物体造成了额外的异常。
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Detection of low-contrast objects by electrical prospecting methods

Many geological problems cannot be solved by electrical prospecting methods. Often the reason for this is a slight difference in the electrical resistivity of target objects from that of the host medium. At the same time, the use of the transverse magnetic (TM) type field makes it possible to identify low-contrast objects and delineate their boundaries with high accuracy. TM-type prospecting is more efficient since its signal is much more strongly affected by changes in resistivity and other electrodynamic parameters. The article examines one of the difficult cases – a search for kimberlite pipes in Yakutia. Such objects differ very little from the host medium in terms of the horizontal resistivity. Exploration works to search for kimberlite pipes in Yakutia, carried out by conventional electrical prospecting methods, have many problems. The article considers the results of successful TM-type prospecting field surveys where kimberlite pipes stood out very prominently. Also presented are the results of modeling an even more complex situation in which the pipes are located at depths of over 140 m and overlain by traps; there are many objects in the area that create additional anomalies.

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来源期刊
Journal of Applied Geophysics
Journal of Applied Geophysics 地学-地球科学综合
CiteScore
3.60
自引率
10.00%
发文量
274
审稿时长
4 months
期刊介绍: The Journal of Applied Geophysics with its key objective of responding to pertinent and timely needs, places particular emphasis on methodological developments and innovative applications of geophysical techniques for addressing environmental, engineering, and hydrological problems. Related topical research in exploration geophysics and in soil and rock physics is also covered by the Journal of Applied Geophysics.
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