Geochemical Evaluation and Biomarkers Applications in Source Rocks and Crude Oils, Kaikang Trough, Muglad Rift Basin, South West Central Sudan

No Thumbnail Available
Date
2015-06-15
Authors
Shama Mohammed, Balulla
Journal Title
Journal ISSN
Volume Title
Publisher
UOFK
Abstract
Cuttings samples were collected for Organic Geochemical studies from two selected wells namelly, Kaikang-3 well (59 samples), and Kaikang West-1(40 samples), Muglad Basin, Sudan. It is aimed to evaluate source rocks potentiality for hydrocarbons generation in terms of their Total Organic Content (TOC) and quality of organic matter by Kerogen Type as well as the Maturity Level. Rock-Eval data, Vitrinite Reflectance measurement and palynofacies analysis from Kaikang-3, revealed a very good-quality of thin oil source beds with excellent generating potential. These beds lie within Tendi Formation at depth interval (1070-1110m). They are characterized by kerogen type II and a mature source rock placed at the beginning of the oil generative window. Analysis for Kaikang West-1 well also indicated very good-quality of thin oil source beds with excellent generating potential within Tendi and Baraka Formations at various depth intervals of Tertiary age. Two crude oil Drill Stem Tests (DSTs) samples from Kaikang-3 well and Kaikang-1 well, as well as two source rock extracts samples from Kaikang-3 well and Kaikang West-1 well were selected for Gas Chromatography (GC) and Gas Chromatography Mass Spectrum (GCMS) analyses. The resulting biomarkers parameter distributions show that, the Kaikang’s oils are similar and derived from lacustrine shale source with relative contribution of bacterial/algal organic matter deposited under suboxic to anoxic conditions and they were derived at the early peak of oil generation window. The two rock extracts showed that the oils were derived from lacustrine shale with high contribution of land plant organic matter deposited under suboxic to oxic conditions. Maturity assessment for these extracts reveal that the sources entered the main phase of oil generative window. XII It is recommended to carry out Gas Chromatography Mass Spectrum/ Mass Spectrum (GC MS/MS) technique to determine the geological age of the source rocks and oils in the Kaikang Trough
Description
Keywords
Geochemical Evaluation and Biomarkers Applications in Source Rocks and Crude Oils, Kaikang Trough, Muglad Rift Basin, South West Central Sudan
Citation