Abstract
The present study was designed to give a clear and comprehensive understanding of the structural situation in the Sohag region and surrounding area by applying several edge detectors to aeromagnetic data. In this research, the International Geomagnetic Reference Field (IGRF) values were removed from the aeromagnetic data and the data obtained were then reduced to the north magnetic pole (RTP). A combination of different edge detectors was applied to determine the boundaries of the magnetic sources. A good correlation was noticed between these techniques, indicating that their integration can contribute to delineating the structural framework of the area. Consequently, a detailed structural map based on the results was constructed. Generally, E-W, N45-60E, and N15-30W directions represent the main tectonic trends in the survey area. The structural map shows the existence of two main basins constituting the most probable places for hydrocarbon accumulation. The results of this study provide structural information that can constitute an invaluable contribution to the gas and oil exploration process in this promising area. They show also that the decision in choosing the location of the drilled boreholes (Balyana-1 and Gerga) was incorrect, as they were drilled in localities within an area of a thin sedimentary cover.
Highlights
Edge detectors have been widely used in geophysical exploration, especially in mapping geologic contacts, faults, dykes, and ore bodies
The Reduction to the pole (RTP) magnetic map (Figure 3b) shows that the of 15 deep area is separated into two main belts; a low magnetic anomaly belt lies at the northeastern part of the area, northeastern part of the area, and a high magnetic belt located at the southwestern and northwestern and a high magnetic belt located at the southwestern and northwestern parts reflects a shallow depth parts reflects a shallow depth of magnetic sources
Different filters were applied to the RTP magnetic data in in this study in order to delineate the edges of magnetic sources for both shallow and deep this study in order to delineate thedykes)
Summary
Edge detectors have been widely used in geophysical exploration, especially in mapping geologic contacts, faults, dykes, and ore bodies. Geosciences 2019, 9, 211 been introduced to overcome such problems and to deal with complex magnetic anomalies These techniques have become fundamental in figuring out the true boundaries of the magnetic source, as they give a comprehensive view of anomalies and delineate the shape of causative sources regardless of their depths, as well as enhance both deep and shallow structures and balance small and large amplitudes of magnetic anomalies by normalizing derivatives of the field data [6]. Among those techniques are: the first-order vertical derivative [7], Euler deconvolution [8], the total horizontal gradient [9], the analytical signal [10], the tilt angle derivative [11], enhanced horizontal derivative [12], total horizontal derivative of the tilt angle [4], Theta map [13], horizontal tilt angle [14], and the enhanced total horizontal gradient of the tilt angle [2]
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