Lineaments as a tool for decision-making in the optimal location of boreholes in the base zone: Case of the department of Abtouyour (republic of Chad)

Abstract

This study has made it possible to highlight that the extraction of structural lineaments helps in the optimal decision-making in the implantation of boreholes in the basement zone. For this purpose, we used remote sensing, as a complementary tool in the extraction of structural lineaments and validated our results with the drillings carried out using electrical tomography carried out in the area. This semi-automatic method allowed us to understand the importance that remote sensing can play in the establishment of successful drilling in the basement zone. For this study we used software such as Excel for drilling data ARMAP 10.8 for GIS, PCI Geomatica software for the extraction of lineaments. The orientation of the lineaments was obtained using the rose diagram of the ROCKWORKS software. In addition, for our study we used images from Landsat 9+, ASTER, DEM, and STRM of 30m resolution which allowed us to develop thematic maps. Thus we were able to validate our Works with the representation by the profiles of electrical resistivity especially the electrical tomography made in the study area and the drillings carried out according to the lineaments extracted. The combination of different parameters in the middle of the basement in a GIS facilitated the spatial analysis, the results was good for the decision making to drill water well in basement area. This approach allowed us to understand that more than 53% of positive drilling intercepts lineaments while only 13% of negative drilling intercepts lineaments.