A report on the geologic and stratigraphic logging project of Semiliki Basin-Albertine Graben in Ntoroko District Western Uganda from 21st/July to 1st/August,2019.
Gatmaj, Lam Ojer
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This report comprises a detailed compilation of aims, methods and materials, lithology and lithostratigraphy, Basin and facies analysis, structures, Geophysics , discussions, conclusions and recommendations for the geologic and stratigraphic logging project of semiliki basin-Albertine graben-Ntoroko district, western Uganda. The aim of the field study was to enable the students apply the geological, geophysical and other relevant theoretical knowledge acquired during the course of the program to study the environments and process of deposition of sediments in the study area and also understand the physical, sedimentological and sequence stratigraphic formations of the area, which are very important in hydrocarbon exploration. The Semliki basin is generally filled with Middle Miocene to recent age sediments exhibiting a fining upward sequence (characteristic of fluvial systems) from conglomerates (overlying the basement rock) to sands, to silts, to clays. It is structurally wedge shaped and majorly comprises faults, joints, laminations and bedding planes, cross beds, foliations, quartz veins, unconformities, soft sediment deformation structures among others. The southern part of this basin has the highest elevation but the smallest thickness of accumulated sediments whereas the depocentre (5km thickness of sediments) is in the northern part of the Semliki basin. The basin has a valid petroleum system evidenced by the abundance of excellent reservoirs, regionally mature source rocks, traps, intra formational and regional seals as well as hydrocarbon- migration pathways in the basin.