| dc.description.abstract | This report is an account of the field work in Semliki Basin, Ntoroko district, Albertine Graben from 14th June, 2022 to 21st June, 2022 with a main objective of field training on how to collect and interpret stratigraphic, petrographic, sedimentologic and structural data; which are very important in hydrocarbon exploration with specific objectives to identify lithologies, relate structures observed in the basement and in the sediments, study the lithologies and environment, in order to identify different elements of the petroleum system and identify the facies and depositional environments together with some knowledge about the geological setting of the basin.
This was done by the help of tools like GPS, compass Jacobs staff, hand lens among others using methods described in Chapter 2 like use of computer software like Techlog and several others together with magnetic, seismic data from Semliki Basin as well as Gulf of Mexico.
These tools and methods enabled logging at different group outcrops to produce sedimentary logs for identification of predominant lithologies in the basement like quartzite, amphibolite, granitic gneiss and in the sediments like sandstone, evaporites, conglomerates, clays and silt as discussed in chapter 3.
Literature review verified the stratigraphic succession of the 7 formations of Semliki basin namely Kisegi, Kasande, Kakara, Oluka, Nyaburongo, Nyakabingo and Nyabusosi formations from bottom to top. Lithofacies in sediments were identified which include sandstone, evaporites, conglomerates, clays and silt as discussed in Chapter 4.
Structures in these lithologies like joints, veins, foliations, banding, faults in the basement and stratification, lamination, ripple marks, load structures, mud cracks among others were identified. Structural measurements were represented on rose diagrams as illustrated in chapter 5. The tectonic history of the basin suggests that Semliki basin is a pull apart basin with NE-SW trending fractures by rifting and later reworked by strike slip tectonic regime. From the tectonic activity, several structures resulted which could form several elements of the petroleum system hence the basin has good petroleum potential.
From the geophysical exploration in the Semliki basin gravity anomalies indicating and magnetic anomalies were observed, seismic data from Gulf of Mexico was interpreted as well as well data from Turaco 2 plus results of previous geothermal exploration in the basin confirming high subsurface heat flow as discussed in chapter 6.
Thus it was deduced from these findings that alluvial, fluvial, flood plain, deltaic and lacustrine environments existed from the facies with a good petroleum potential. | en_US |
