Study of the Geology and Structures of Delta Tokar, (A Tectonic Model) Red Sea State, Sudan

Abstract

This study of the Geology and Structures of Delta Tokar, Southern Red Sea; A Tectonic Model' concerns with the type of the crust of the Red Sea in the study area and to determine the thicknesses of the sediments and depth to the basement rocks and to different sedimentary formations and the structures.

Three geophysical methods used in this study, the first method is the seismic method as a main method to study the sediments, thicknesses and structures. Magnetic and gravity methods are the second and third method which used for supporting, regional study and deep methods for the study of the crust and its structures and type.

Profiles and maps created by the magnetic method from the reduction to the pole, vertical integration filter, first vertical derivative and second X-horizontal derivative and also that created by the gravity method from the polynomial fitting, wavelength filter, second vertical derivative, second X-horizontal derivative and the residual gravity shows that: (1) the earth's crust beneath the Red Sea changes gradually towards the eastern direction into dense intermediate crust (2) great and deep fault lines present in the area (3) characteristic sedimentary depressions are dominant in the area.

The seismic reflection method interpreted using synthetic seismograms of Suakin-1 well and drilling information of Suakin-2 well showing: (1) time to top basement rocks and depths, (2) time to top of the different sedimentary formations and depths (Hamamit, Rudeis, Kareem, Belayim, Dungunab, Zeit, Wardan and Shagara Formations) and (3) geological structures in the study area are mainly normal, reverse, step, graben and horst faults and different salt forms.