Diagenetic Study of the Lower Permian Rotliegend Sandstone, Leman Field, Southern North Sea

Sullivan, Morgan David (1991) Diagenetic Study of the Lower Permian Rotliegend Sandstone, Leman Field, Southern North Sea. PhD thesis, University of Glasgow.

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The Lower Permian aeolian and wadi subarkoses of the Rotliegend Sandstone, UK southern North Sea, are up to 270 m thick and form the reservoir for the economically important Leman gas field. The diagenetic history of these sands was studied using petrographic, geochemical, and isotopic techniques in order to relate the diagenetic sequence to the burial and tectonic history of the field. The earliest authigenic phases consist of hematite and illite clay rims on detrital grains which precipitated soon after deposition from intrastratal alteration of iron silicates by meteoric groundwater. On the basis of oxygen, carbon, sulphur and strontium isotope data, the remainder of the diagenesis occurred in fluids derived from the mixing of waters from the overlying Zechstein evaporites and underlying Carboniferous shales, which displaced the interstitial meteoric porewaters of the Rotliegend. Flushing of the Rotliegend Sandstone by mixed Zechstein/Carboniferous waters produced two generations of pervasive dolomite cement. Oxygen isotope values for the dolomite reflect precipitation at temperatures between 35

Item Type: Thesis (PhD)
Qualification Level: Doctoral
Keywords: Geology, Sedimentary geology
Date of Award: 1991
Depositing User: Enlighten Team
Unique ID: glathesis:1991-78283
Copyright: Copyright of this thesis is held by the author.
Date Deposited: 30 Jan 2020 15:34
Last Modified: 30 Jan 2020 15:34
URI: https://theses.gla.ac.uk/id/eprint/78283

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