>Magister Scientiae - MSc / Clay 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.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:uwc/oai:etd.uwc.ac.za:11394/3895 |
| Date | January 2013 |
| Creators | Samakinde, Chris Adesola |
| Contributors | Opuwari, Mimonitu, Donker, Jan Van Bever |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Rights | University of Western Cape |
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