Geophysics and geology field work report of the albertine graben, semliki area in western Uganda.
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The report contains a detailed compilation of findings from the geological field study that was carried out in Semiliki basin located in the southern part of the Albertine graben that lies in the northern part of the western arm of the East African rift system, western Uganda. The materials and methodology used to achieve the main objective of collecting and interpreting of stratigraphic, petrographic, sedimentological and structural data from outcrops and relate results from the petroleum system with the specific objectives that include; to identify lithologies in the sediments, to identify and relate structures observed in the basement and the sediments, to study the lithologies and environment, to identify different elements of the petroleum system and to determine the facies and depositional environments, have been outlined and discussed in chapter two. We collected vast structural and stratigraphic data that we then analyzed to make conclusions about the petroleum potential of Semliki basin. Intensive tectonic activity affected the basin. This led to the formation of different structures within the basement and sediments that are discussed in chapter five. The area’s post-rift lithology is made up of sedimentary rock whose lithofacies and architectural analysis indicate alluvial plain, delta plain, delta front, or lacustrine depositional environments with a provenance of the Rwenzori ranges and the pre-rift lithology of the basement consists of altered granites and granitic gneisses, felsic and mafic rocks. The magnetic and gravity data is used to identify the depocenter of the basin as well as the section interpreted from the seismic data. The visit to Sempaya hot spring within Semliki basin is evidence of a high geothermal gradient which would otherwise foster early maturation of hydrocarbons. We concluded that the Semliki basin, has a complete petroleum system characterized with all the required system components that are source rocks reservoir rocks, seals, traps and migration pathways and there is a chance of discovery of petroleum. So, exploration programs should be continued. The results of the seismic study of the Gulf of Mexico indicate considerable resemblance with that of the Semiliki basin of the Albertine Graben.