dc.identifier.citation | Mabor, M. (2022).Fieldwork report of Kibuku area, Semliki basin within Albertine Graben, Ntoroko District, Western Uganda.(MakUD) ( Unpublished undergraduate technical report).Makerere university , Kampala, Uganda | en_US |
dc.description.abstract | The field study report was conducted from 21th/July to 1st / August, 2019 within the Semliki Basin in Ntoroko district, Western Uganda. 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) as well as sediments of lacustrine and
deltaic origin from conglomerates (overlying the basement rock) to sands to silts to clays. The
sediments are underlain by possible Jurassic to Early Tertiary age sediments resting
unconformably over the basement rocks (granites and granite gneiss). Basin and facies analysis
involved the interpretation of the depositional environments, basin architecture, paleo flow
directions and petroleum potential of the Semliki basin.
The basin was affected by intensive tectonic activity, that led to the formation of vast types of
structures. These include faults, joints, and veins among others in the basement rocks. Structures
present in the soft sediments include bedding, cross-bedding, laminations, unconformities, mud
diapirs, and plunging folds among others.
As far as the geophysics of the basin is concerned, Geophysical data ie potential field data of
semliki basin and shallow, high resolution (150-200 Hz) seismic data with a vertical resolution of
c. 3m from an intra slope salt withdrawal mini basin in the Gulf of Mexico were availed to
students for interpretation and these were not obtained by students in the field.
The sediments of the Semliki Basin represent a petroleum play for hydrocarbon accumulations as
all elements (the source rock, reservoir rock, trap, seal, migration pathways, maturation and
timing) were identified in the field. The presence of oil seeps indicates that organic rich source
rocks are present. Information from the field visit to Sempaya hot spring indicate the presence of
high enough geothermal gradients of over 67°C/km for the maturation and generation of hydrocarbons at shallow depths. | en_US |