Geologic and stratigraphic logging project of the semiliki basin in the Albertine Graben region, Ntoroko District, Western Uganda.

Abstract

The semiliki basin is covered by sediments that represent the middle Miocene to recent, which are described from the outcrops exposed by the road cut exposed in the area of study, underlain by possible Jurassic or permo-triassic to early tertiary sediments, which rest unconformably on the basement described by seismic data. This study has allowed a better understanding of the stratigraphic relationships of the different rock units that are exposed on the outcrop. In general, the depositional environment of the semiliki basin is fluvial-lacustrine/deltaic showing significant variations in grain sizes and grain size distribution in the different layers, which shows the water-level changes and the river interactions during the depositional period and the influence of rifting tectonics and sediment deposition through time and space. The sediments in the Semiliki Basin represent a petroleum play for hydrocarbon accumulation, in which the necessary elements of a valid petroleum system were identified. This include good excellent or good potential for reservoirs and top seals as well as circumstantial evidence of regionally mature source rocks due to the preence of hot springs indicating a good geothermal gradient for source rock maturity, possible seals, traps and hydrocarbon migration pathways