University of Khartoum

Gravity and Electrical Methods for Studying the Groundwater Associated Structures in the area of Um Rimita (White Nile State), Sudan

Gravity and Electrical Methods for Studying the Groundwater Associated Structures in the area of Um Rimita (White Nile State), Sudan

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Title: Gravity and Electrical Methods for Studying the Groundwater Associated Structures in the area of Um Rimita (White Nile State), Sudan
Author: Suliman, Rasha Elbashir Musa
Abstract: A Bouguer gravity anomaly map and sixty two (62) Vertical Electrical Sounding (VES) measurements in the area west of the White Nile between Latitudes 14◦40-15◦35 N and Longitudes 32◦10-32◦30 E are used to investigate the geology and subsurface structures of the region.The aim of the study is to obtain the general configuration of the Basement Complex and to provide information about the nature and structures of the formations as well as to assess groundwater associated problems. Measurements of electric resistivity were carried out along selected profiles superimposed on the Bouguer gravity map. The geoelectric cross-sections and the gravity models are constructed along the same profiles to disclose sediment variation and confirm geometry of the subsurface geology. The Basement Complex is affected by several step normal faults which make undulations on its surface where the sediments are deposited with various thickness. The main aquifer in the area is represented by the Nubian Sandstone Formation. The major depression in the study area (Sheikh el Sidig) is oriented in a NW-SE direction. A major fault bounded uplift is recorded in the west of the area. The delineated basins in the study area are relatively shallower than these basins of the Gezira and the White Nile Rift. Five (5) gravity profiles are drawn, generally perpendicular to the major axis of the structures in the area. These are lately used for quantitative interpretation. A Graph-Model Computer Software is used for gravity modeling which is based on line-integral method of computation. The electrical field curves are modeled with the aid of Resix (Interpex 1993). The interpretation results are presented in a form of geo-electrical sections. A subsurface structural map is proposed showing inferred sedimentary basins, fault troughs and uplifted Basement blocks. The basins are believed to be fault-controlled and developed by extensional tectonics. As for the mechanism and cause of faulting, the area is considered as part of the Central Sudan rift system which had been subjected to several tectonic events since Early Cambrian to Tertiary times.
URI: http://khartoumspace.uofk.edu/123456789/24183


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