文章基本信息

标题：Enhancement the VES models based on the TEM measurements and the application of static shift corrections.: case study from Egypt
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作者：Manal M. Osman ; Gad M. El-Qady ; Th Abdel Fattah 等
期刊名称：NRIAG Journal of Astronomy and Geophysics
印刷版ISSN：2090-9977
电子版ISSN：2090-9985
出版年度：2021
卷号：10
期号：1
页码：279-289
DOI：10.1080/20909977.2021.1915080
语种：English
出版社：Elsevier
摘要：Variations in conductivity in the near-surface, such as the presence of small and localized three-dimensional (3D) bodies, cause a galvanic distortion in direct current (DC), so the measured apparent resistivity is affected by a constant shift on a log scale called Static Shift. In this study, We used electromagnetic sounding techniques to correct for the static shift affecting the electric resistivity data only. The term “static shift” is used because apparent resistivity is distorted by a constant, shifting value (S) on a log scale, which lead to misleading interpretation. It was noticed that the two data sets' sounding curves at the same location have a concordant pattern. The problem was noticed in the 1D inversion models for VES and TEM were not matched together before removal of VES data shift. The TEM and VES measurements are represented on the same graph, then the shifting factor (S) is calculated for the VES curves to directly overlap the TEM curve. The 1D inversion model for VES curves after removing the shifting factor shows matched data with the TEM 1D model.
关键词：Shalateen;resistivity;tem;static shift