Microsoft word - ahmed seismic 2009.doc

Zagazig University
Faculty of Science
Department of Geology
To the Department of Geology, Faculty of Science, Supervisors
Late Prof. Dr. M. A. Shabaan
Prof. Dr. Ali Ali El-Khadragy
Prof. Dr. Salah Shebl Saleh
Dr. Mohamed Housein Saad
Zagazig University
Faculty of Science
Department of Geology
The potential information with seismic reflection data acquisition carried out in the South-Sitar area had been analyzed and integrated with Other geological studies to extract information about the nature of subsurface rock distribution and to clarify its subsurface geological configuration that probably favoring for the hydrocarbon accumulations. To achieve this goal, several transformation techniques and various filtering processes were accomplished through both qualitative and quantitative analyses. At first, the total intensity aeromagnetic map was processed by the application of the reduction to the pole technique. The main trend patterns and different tectonic forces affecting the area were analyzed on the Bouguer and RTP maps using the directional filtering technique (sun-shade). After that, the regional-residual separation methods were carried out through applying different theoretical assumptions both in space domain (moving average and nine-points) and in frequency domain (utilizing the matched filtering technique based on spectral analysis) as well as the least-squares polynomial fitting. Other intensive and higher resolution techniques of filtering were used for better anomaly differentiation including the first and second vertical derivative, vertical continuation (both downward and upward), the magnitude of the horizontal gradients (to locate boundaries) and the analytical signals transform data (to estimate depths). All the previously filtered maps had been qualitatively described and interpreted at a proper level and most preferable trend surfaces. Subsurface statistical trend analysis was quantitatively obtained by applying the successive overlap technique for different filtered gravity and magnetic maps. Analysis of the detected tectonic lineaments illustrates that the area is affected by six tectonic trends namely; Tethyan (E-W), Syrian Arc (N45°-65°E), Najd (N55°-65°W), Tibesti (NE-SW), East African (N-S), and Suez (N35°-45°W) trends. These trends differ in the abundance ratio but all of them are represented for both the gravity and the magnetic maps. Furthermore, surface structural lineaments in the investigated area had been recognized and interpreted as fractures including faults. It reveals four main sets of surface fractures including the E-W, NW, ENE & NNE trending faults with a difference in the orders of predominance. These four tectonic trends seem to be rejuvenated during several orogenies throughout the geologic history of the area. Generally, the comparison between the two data sets reveals that the study area is characterized by simple geologic features


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