Geological Interpretation of Several Gravity and Magnetic profiles from the Nile Delta, Egypt PDF

Keywords

gravity, magnetic profiles, Nile

Abstract

Interpretation of three Bouguer gravity and total intensity magnetic profiles from the Nile Delta region suggests a northward increase in basement depth (2-Skm). A prominent basement uplift is found to the south, which is considered a part of the major basement high that includes Khatatba-Abu Roash. In addition, a significant deepening of the basement is found to the north. This is considered a part of the major subsidence including the Mediterranean. The abnormal thickness of the sedimentary section of various sedimentary facies, and the occurrence of a deep causative intrabasement body (> 23 km) are considered the main causes for the major negative gravity anomaly and the relatively low magnetic intensity in the Nile Delta region. Ignoring density changes with depth in delta, and ignoring the possible presence of fluids within the productive horizons that give abrupt change in densities are considered the main causes responsible for the failure of the Agarwal method for determining the expected basement depths using gravity data.