Classification and Diagenetic Characteristics of the Cretaceous Sandstones in the Southern Bredasdorp Basin, Offshore South Africa

Simple item page
dc.contributor.authorBAIYEGUNHI, Temitope Love 0000-0002-5471-0628
dc.contributor.authorLIU, Kuiwu 0000-0002-2930-1611
dc.contributor.authorGWAVAVA, Oswald 0000-0002-6398-7805
dc.contributor.authorBAIYEGUNHI, Christopher 0000-0003-2748-3332
dc.date.accessioned2026-02-23T21:38:53Z
dc.date.available2026-02-23T21:38:53Z
dc.date.issued2021-10-30
dc.description.abstractA systematic petrographic and geochemical studies of 92 representative sandstone samples from exploration wells E-AH1, E-AJ1, E-BA1, E-BB1 and E-D3 in the southern part of the Bredasdorp Basin was undertaken to classify the sandstones as well as unravel the main diagenetic processes and their time relations. Petrographic study shows that the sandstones are largely subarkosic arenite and arkosic litharenite, which have underwent series of diagenetic processes as a result burial, rifting and subsequent uplift. The main diagenetic processes that have affected the reservoir properties of the sandstones are cementation by authigenic clay, carbonate and silica, growth of authigenic glauconite, dissolution of minerals and load compaction. The major diagenetic processes reducing the porosity are calcite cementation in the subarkosic arenite, and compaction and quartz cementation in arkosic litharenite. On the other hand, the formation of secondary porosity due to the partial to complete dissolution of early calcite cement, feldspars and minor grain fracturing has improved the reservoir property of the sandstone to some extent. The clay minerals in the sandstones commonly acts as pore choking cement, which reduces porosity. In general, there is no particular diagenetic process that exclusively controls the type or form of porosity evolution in the sandstones.
dc.description.sponsorshipThe authors are grateful to the National Research Foundation-Southern African Systems Analysis Centre (NRF-SASAC; UID: 118768) and the DSI-NRF Centre of Excellence (CoE) for Integrated Mineral and Energy Resource Analysis (CIMERA) for financial support.
dc.identifier.citationBaiyegunhi et al., 2021. Classification and Diagenetic Characteristics of the Cretaceous Sandstones in the Southern Bredasdorp Basin, Offshore South Africa. Acta Geologica Sinica (English Edition), 95(5): 1695–1713. DOI: 10.1111/1755-6724.14701
dc.identifier.issn1755-6724
dc.identifier.urihttp://hdl.handle.net/20.500.11837/3809
dc.language.isoen
dc.publisherWiley
dc.subjectdiagenesis
dc.subjectcementation
dc.subjectreservoir properties
dc.subjectsandstones
dc.subjectBredasdorp Basin
dc.titleClassification and Diagenetic Characteristics of the Cretaceous Sandstones in the Southern Bredasdorp Basin, Offshore South Africa
dc.typeArticle

Files

Original bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
Acta Geologica Sinica Eng - 2021 - BAIYEGUNHI - Classification and Diagenetic Characteristics of the Cretaceous Sandstones.pdf
Size:
7.76 MB
Format:
Adobe Portable Document Format
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Research Outputs