Two-and-a-Half Dimension Gravity Modeling to Delineate the Structures of the Western Abu Gharadig Basin, Western Desert, Egypt

摘要

The present study is a trial to carry out 2 1/2-dimensional gravity modeling to confirm the structures and tectonics of the western Abu Gharadig Basin, Western Desert, Egypt. This is achieved by a sequence of procedures, started by establishing the trends of six 2 1/2-dimensional residual gravity models, most of them passing through the available control wells. Two-and-a-half-dimensional gravity modeling of mass distributions in the subsurface of the study area was performed on the significant residual anomalies of the area, which had been separated from the unwanted regional field. They were separated using the average power spectrum method available in the suite of programs provided by Geosoft (1994). Such 2 1/2-dimensional models were constructed to reveal the dissecting structures and to subdivide the sedimentary sequence of the area into 10 time-rock and rock units (Paleozoic and Jurassic sequences, Alamein-Shaltut, Kharita, Bahariya, Abu Roash, Khoman, Apollonia, and Dabaa), in addition to the underlying basement complex. Some seismic sections were used to help constrain the construction of 2 1/2-dimensional models.