Aeromagnetic data interpretation of east Qattara Depression, Northwest Desert, Egypt
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The study area is located at the east of Qattara Depression at the north of the Western Desert of Egypt. The study area contains Abu Gharadig basin, which is the most petroliferous basin in the Egyptian Western Desert. Only three exploratory wells are presented in the study area, showing a thick sediment section overlying basement rocks. Magnetic data have been frequently used in geophysical exploration. Aeromagnetic data are mainly utilized to estimate the depth to the magnetic basement as well as to delineate the possible structures of the study area. The depth to magnetic basement has been estimated using the analytical solution of exponential equations obtained from the Fourier transformation of magnetic data, assuming multi-prisms. The depths obtained from this technique vary from 0.70 to 2.91 km with an average depth of 2.08 km. Local phase filters have been mainly used as edges detector where the possible occurrences structures can be delineated. Hyperbolic tilt angle, second-order tilt angle, and normalized total horizontal derivative (TDX) provide the best results for delineating the possible structures, showing the possible contacts within the basement of the study area. The edge enhancement filters show that the study area has been affected by different structural trends taking E-W, NE-SW, NNE-SSW, N-S, and ENE-WSW directions.
KeywordsAeromagnetic Depth determination Analytic solution Fourier transformation Local phase Tilt angle
The author would like to thank Mohamed H. Saad of Egyptian Petroleum Institute for providing me the aeromagnetic data. Also, special thanks go to the two anonymous reviewers for their comments which improve the original manuscript.
- Abu El-Ata ASA (1990) A comparative study of some aeromagnetic techniques for basement configuration in Qattara depression area, Western Desert, Egypt. M.E.R.C. Ain Shams Univ Earth Sci. Ser. 4:65–80Google Scholar
- Abu El-Ata A.S.A., Abd El-Nabi S.H. (1987) The role of the structural activations and the stratigraphic manifestations in the origin of the Qattara Depression, Western Desert, Egypt, using gravity modelling; E.G.S. proc. of 5th ANN. Meet., Cairo, p. 90–110Google Scholar
- Blakely TJ (1996) Potential field theory in gravity and magnetic applications, Cambridge University Press, Cambridge, p 300–305Google Scholar
- Frizon de Lamotte D, Raulin C, Mouchot N, Daveau JCW, Blanpied C, Ringenbach JC (2011) The southernmost margin of the Tethys realm during the Mesozoic and Cenozoic: Initial geometry and timing of the inversion processes. Tectonics 30:TC3002. https://doi.org/10.1029/2010TC002691 CrossRefGoogle Scholar
- Meshref WM, El-Sirafe AM (1988) Geophysical interpretation of the regional structural setting of Abu Gharadig Basin, Northern Western Desert of Egypt. E.G.S. Proc. of the 6th Ann. Meet. Cairo. P.115–123Google Scholar
- Saad MH (2008) Delineating the subsurface structural setting of the east Qattara Depression area, North Western Desert, Egypt, using aeromagnetic and gravity data, Egypt. J Petrol 17:117–131Google Scholar
- Spiegel MR (1972) Theory and Problems of Complex Variables. McGraw-Hill Book Company, New York.Google Scholar