University of Khartoum

Structural and Stratigraphic Trap Development during the evolution of Extensional North Melut Rift Basin, Sudan

Structural and Stratigraphic Trap Development during the evolution of Extensional North Melut Rift Basin, Sudan

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Title: Structural and Stratigraphic Trap Development during the evolution of Extensional North Melut Rift Basin, Sudan
Author: Ahmed, Mohamed Mohamed Hamid
Abstract: The objective of this study is to address the reconstruction of the complex tectono-stratigraphic framework of the Cretaceous to the Quaternary North Melut extensional rift basin. This is accomplished through the study of the existing fault population and patterns that have affected the pre-, syn and post rift sedimentary pile. Examination of the inter-relationship between the evolution of the rift phases and their accumulated stratigraphic unit characters is also achieved. The methodology followed is based on performing wireline log data interpretation and correlation, 2D seismic line profiles interpretation and 2D-Move restoration and back striping. These faults evolved during the extensional and mild compressional stages of the basin development. The intra-basinal half grabens and full grabens geometries accommodated various sets of interrelated synthetic and antithetic faults with different polarity changes. The faults reorganized and caused vertical stacking of dissimilar lithological units in transverse, horizontal trap geometries across the faults. The accommodation of such structural movements in an antiformal pattern served the goal of typical hydrocarbon trap formation during the origin and evolution of the basin. The study also revealed that the stratigraphic succession, forming the reservoir and seal rocks accumulated during the pre-rift stage, is dominated by fluviatile depositional environment. The syn-rift sequences are indicative of alternating fluvial sands and lacustrine shales, whereas the post-rift stratigraphic units are dominated by fluvial coarse sediments Graduation from full lacustrine to fluvial depositional setting and full fluvial to lacustrine depositional environment is common during the thermal and mechanical subsidence of North Melut rift basin evolution has resulted in the development of both reservoir and seal rocks. Exploration for Hydrocarbons in Melut sedimentary basin required better understanding of the prevailing structural style, and stratigraphic scheme for the definition and evaluation of the petroleum system elements.
URI: http://khartoumspace.uofk.edu/handle/123456789/17401
Date: 2015-12-02


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