Abstract
Electrical resistivity and Very Low Frequency electromagnetic profiles (VLF) were introduced for a litho-structural study in the locality of Douira, located in the Errachidia basin. The electrical reading was carried out with a Schlemberger type device. The VLF profiles were implemented with a different length reaching 1600 m and profile lines oriented in the direction NNW-SSE and N-S. The VLF measurements were obtained using an Iris T-VLF instrument and the data filtering was carried out using the KHFFILT software. The Karous-Hjelt filter was applied to the real component of the secondary electromagnetic field. The qualitative interpretation of the resistivity results has shown that the formations identified in the locality of Douira are more resistant than those encountered around Ain Al Atti, this difference is the salinity coming from marly formations with intercalation of gypsum deep in the vicinity by Ain Al Atti. The semi-quantitative interpretation of the VLF results showed the presence of a main fracture zone, oriented NW-SE, which feeds the Ain Al Atti source.
Highlights
In Morocco, the continual decrease in water resources is the current major problem, since water is a determining factor for sustainable development and improving the quality of life
Taking into account the electrical logs (Fig. 8a and 8b), we observe that for the upper part of the field investigated, the formations encountered at Douira are relatively the same encountered at Ain Al Atti, in depth we find a variation of facies, these marly formations with intercalation of gypsum encountered in depth, caused a significant decrease in the electrical resistivity in the vicinity of Ain Al Atti
We have contributed to the litho-structural study at the level of the locality of Douira and near the artesian source of Ain Al Atti, by combining the electrical technique and the very low frequency electromagnetic method
Summary
In Morocco, the continual decrease in water resources is the current major problem, since water is a determining factor for sustainable development and improving the quality of life. The salt water from the source of Ain Al Atti has a negative impact on the environment by inducing direct chemical contamination on the aquifers in place. This requires urgent intervention to curb the polluting flow from this source (Ammary, 2007). The problem addressed by this study concerns the potential groundwater in the locality of Douira north of the Ain Al Atti source. To achieve the objective of this article to highlight the litho-structural parameters, the working procedure will be based on electrical soundings, in order to determine the vertical variation of the resistivity obtained at the level of Douira and at the level of Ain Al
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