Depth to basement analysis from gravity field over the Guelb Ahmer horst (Ghadames petroleum province, Southern Tunisia, North Africa)

The Exploration complex geological structures like crystalline basement, significant to hydrocarbon exploration, is complicated in seismic interpretation. Gravity data were analyzed at a Guelb Ahmer horst situated to northern border of Ghadames basin (Southern Tunisia). The average radial spectrum from an area of 40x40 km of the gravity data grid reveals the deep and intermediate basement sources depths. 3D Euler deconvolution technique illustrates also the limits of the crystalline basement sources running essentially between 2000 and 3000 meter deep. The geometries of Mesozoic rocks, Paleozoic strata and Precambrian basement rocks are estimated by five 3D gravity models. These models give a significant support for the determination of potential structural traps related to the Guelb Ahmer horst.