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Geological Society, London, Special Publications; 1995; v. 86; p. 125-139;
DOI: 10.1144/GSL.SP.1995.086.01.10
© 1995 Geological Society of London

Case Studies

Diagenesis of the Rotliegend Sandstones in the V-Fields, southern North sea: a fluid inclusion study

B. McNeil1,2, H. F. Shaw1 & A. H. Rankin1,3

1 Department of Geology, Imperial College, London SW7 2BP, UK
2 Institute of Geosciences, University of Tsukuba, Ibaraki 305, Japan
3 Department of Geology, University of Kingston, Kingston-on-Thames, UK

Illite, quartz, Fe-dolomite (with some dolomite), anhydrite and barite are the principal pore-filling cements in the analysed samples of the Rotliegend sandstones from the Vulcan, South Valiant and Vanguard Fields of the southern North Sea. Apart from illite, these cements also infill fractures cutting the Rotliegend sandstones, but in the fractures there is a predominance of anhydrite and barite whereas in the pore infills, quartz and Fe-dolomite predominate. The quartz, Fe-dolomite and sulphate cements have been studied using a variety of analytical techniques but with the emphasis on fluid inclusion microthermometry. The results indicate that fluids at temperatures of 70 to 125°C, with salinities of 17 to 24 eq. wt% NaCl and an overall composition of Na-Ca-Mg-K-Cl-SO4, were involved in authigenic mineral formation in pore spaces and fractures. Hydrocarbons were detected in the fluid inclusions hosted in the cements and indicate that cementation occurred in the presence predominantly of methane and only rarely liquid hydrocarbons. Relating the microthermometry homogenization/formation temperatures to the burial history, quartz cementation occurred mainly in the late Permian to late Cretaceous, Fe-dolomite during the Jurassic to mid-Cretaceous, and anhydrite and barite mainly in the mid-to late Cretaceous.





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[Abstract] [PDF]