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