Detection of hydrocarbon seeps using remote sensing technique in the Rufiji onshore basin

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dc.contributor.authorMruma, Abas
dc.date.accessioned2019-03-06T08:33:18Z
dc.date.available2019-03-06T08:33:18Z
dc.date.issued2017
dc.descriptionDissertation (MSc Petroleum Geoscience)en_US
dc.description.abstractHydrocarbon seeps cause chemical and mineralogical alterations at the surface, which can be identified geologically but also detected by remote sensing techniques. This work aimed at detecting mineral alteration induced by hydrocarbon seeps in a sandstone formation in Rufiji basin (Wingayongo), South Coast Tanzania. For this study, rock samples collected during fieldwork were petrographically analysed and the multispectral ASTER data was downloaded and utilized to characterize the identified alteration minerals in the Wingayongo sandstone. The area is covered by medium-grained gray to brown chocolate bituminous sandstone, which acts as reservoir rock but with no cap rock overlaying it. The contact between sandstone layers was identified and defined as the main source of hydrocarbon migration pathways. The large area of this sandstone is bleached indicating discolouration of ferric iron into ferrous iron. Elemental sulfur greenish yellow in colour together with sulphur smell was identified around the seep. Petrographic analysis (XRD and Thin Section) have shown the high value of ferrous iron but there was no evidence of clay (kaolinite) or carbonate minerals. Remote sensing spectral signature through band ratio enhancement indicated the presence of siderite material, altered vegetation together with un-vegetation signals. The observed signals are potential vectors for oil seeps. Other prospective areas were identified using similar spectral signals in the surrounding areas. The use of more than one data-set together with the use of a more powerful remote sensing technique is recommended to overcome challenges in interpretation and issues of scale of alteration and other controversors.en_US
dc.identifier.citationMruma, A. (2017). Detection of hydrocarbon seeps using remote sensing technique in the Rufiji onshore basin. Dodoma: The University of Dodomaen_US
dc.identifier.urihttp://hdl.handle.net/20.500.12661/580
dc.language.isoenen_US
dc.publisherThe University of Dodomaen_US
dc.subjectHydrocarbon seepsen_US
dc.subjectMineralogical alterationsen_US
dc.subjectMineral alterationsen_US
dc.subjectSandstoneen_US
dc.subjectRufijien_US
dc.subjectTanzaniaen_US
dc.subjectOil seepsen_US
dc.subjectHydrocarbonen_US
dc.subjectHydrocarbonsen_US
dc.subjectSandstone formationen_US
dc.subjectRemote sensingen_US
dc.subjectRemote sensing techniquesen_US
dc.titleDetection of hydrocarbon seeps using remote sensing technique in the Rufiji onshore basinen_US
dc.typeDissertationen_US
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