Show simple item record

dc.contributor.advisorOpuwari, Mimonitu
dc.contributor.advisorDonker, Jan Van Bever
dc.contributor.authorSamakinde, Chris Adesola
dc.date.accessioned2014-11-21T08:02:46Z
dc.date.available2014-11-21T08:02:46Z
dc.date.issued2013
dc.identifier.urihttp://hdl.handle.net/11394/3895
dc.description>Magister Scientiae - MScen_US
dc.description.abstractClay diagenesis phenomenon and their effects on some petrophysical properties of lower cretaceous silliciclastic sandstones, offshore Orange basin have been established. Previous studies on Orange basin revealed that chlorite and quartz cements have significantly compromised the reservoir quality in this basin but it is expected that the reservoirs shows better improvement basinward, an analogy of this is displayed by tertiary sandstones deposit, offshore Angola. The main goal of this thesis is to perform reservoir quality evaluation by intergrating geological, geochemical and geophysical tools to substantiate the effects of clay minerals distribution and its subsequent diagenesis on the intrinsic properties (porosity, permeability and saturation) of reservoir intervals encountered within three wells in block 3A (deeper waters), offshore Orange basin. Five lithofacies were identified based on detailed core description from wells KF-1, KH-1 and AU-1 in this block. The facies were grouped based on colour and grain sizes, they are named : A1 (shale), A2 (sandstone), A3 (siltstone), A4 (dark coloured sandstone) and A5 (conglomerates).Depositional environment is predominantly marine, specifically, marine delta front detached bars and deepwater turbiditic sandstone deposit. Geophysical wire line logs of gamma ray, resistivity logs combo and porosity logs were interpreted, parameters and properties such as VCL, porosity, permeability and saturation were estimated from these logs and the values obtained were compared with values from conventional core analysis data, the values agreed well with each other. Detailed petrographic studies (SEM, XRD and thinsection) plus geochemical studies (CEC, EDS, pH, Ec) were carried out on twenty two core samples to establish if these clay minerals and other cements have pervasive effects on the reservoir quality or otherwise.en_US
dc.language.isoenen_US
dc.subjectClay mineralsen_US
dc.subjectDiagenesisen_US
dc.subjectPetrophysical propertiesen_US
dc.subjectCretaceous sandstonesen_US
dc.subjectOrange basinen_US
dc.titleAssessment of the effects of clay diagenesis on some petrophysical properties of lower cretaceous sandstones, block 3a, offshore orange basin South Africaen_US
dc.rights.holderUniversity of Western Capeen_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record