Analysis of Geophysical Data for Evaluate Basement Uplift and Sedimentary Basin Structures.

Document Type : Research

Authors

1 Geology Department, Faculty of Science, Aswan University.

2 Head of Aswan Branch of the National Research Institute of Astronomy and Geophysics.

3 Geology department, faculty of science, Aswan university.

4 Geology department, faculty of science, Aswan university

Abstract

Upward continuation maps at a depth of 50 m were generated to analyze how anomaly characteristics evolve with increasing observation distance, revealing strong similarities to the Bouguer anomaly map. This similarity suggests that most of the anomalies originate from deep sources. Low-pass filtering was employed to isolate regional anomalies, showing gravity values ranging from 1156.5701 mGal in the northeastern, eastern, and southeastern regions to 1149.6192 mGal in the western and northwestern regions. These variations are attributed to the uplift of denser basement rocks and the presence of sedimentary basins, respectively. High-pass (residual) filtering further highlighted local anomalies, with gravity values ranging from 0.0076 mGal to -0.0103 mGal, identifying areas of basement uplift and localized basin structures. A series of upward continuation maps has been created to eliminate residual sources and achieve a more reliable regional surface that aligns with the regional map obtained through the separation process. An upward continuation filter was applied to the map at a depth of 50m to illustrate how anomaly characteristics change as the observation distance from the source increases. Examination of the upward continuation maps reveals a strong similarity to the Bouguer anomaly map, suggesting that most of the anomalies likely originate from deep sources.

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