Semlik Basin field study

Abstract

Fieldwork for this report was done from January 2 to January 10, 2022, in the western Ugandan district of Ntoroko, inside the Semliki Basin. This report is a thorough collection of the research results from the Semliki basin field study in Western Uganda's Albertine region. The report is divided into eight chapters that provide a detailed account of the goals, tools and techniques, lithology and stratigraphy, analysis of the basin and facies, structures, geophysics of the Semliki basin, and discussion of findings that aid in comprehending the petroleum system of the study area. The sediments that make up the Semliki basin are typically of Middle Miocene to recent age and show a fining upward sequence (typical of fluvial systems) from conglomerates (which cover the basement rock) to sands to silts to clays. It has a wedge-shaped structural pattern and is mostly made up of faults, joints, laminations and bedding planes, cross beds, foliations, quartz veins, unconformities, and soft sediment deformation structures, among other things. The depocenter (5km thickness of sediments) is in the northern section of the Semliki basin, whereas the southern half of this basin has the highest elevation but the shortest thickness of deposited sediments. The abundance of excellent reservoirs, regionally mature source rocks, traps, intra formational and regional seals, as well as hydrocarbon-migration paths in the basin provide indications that the basin contains a functional petroleum system.