Advances in reservoir geology by Michael Ashton, Geological Society of London

By Michael Ashton, Geological Society of London

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The Vanguard Field sandstones did not experience the extensive formation of kaolinite from feldspar which characterizes the early diagenesis of many Rotliegendes reservoirs (Glennie et al. 1978; Lee et al. 1989). This conclusion is consistent with the observations of Rossel (1982) that Rotliegendes reservoirs in the Sole Pit Basin contain drusy illite/chlorite and feldspar rather than kaolinite. The textural features present in Figs 14 and 15 suggest that the grain coating chlorite formed from pellicle clays and iron oxide cements.

LAHANN ET AL. 56 graphy and production logging. Explanation of the highly variable production rates would not have been possible without extensive core control. References BJORLYKKE, K. 1984. Formation of secondary porosity: How important is it? A. C. (eds) Clastic Diagenesis. American Association of Petroleum Geologists Memoir, 37, 277-286. C. C. 1978. K. southern North Sea. Journal of the Geological Society, London, 135, 25-34. B. 1989. Diagenetic quartzarenite and destruction of secondary porosity.

Iii i Fig. 16. Thin-section photomicrograph of medium- to coarse-grained aeolian dune foreset sandstone in well Q03/08. Porosity is 20%, and permeability is 750 mD. Note the etched feldspar/lithic grains near centre and at far right (arrows). The partially dissolved grain near the centre was partially crushed after the etching event. Many linear grain contacts (arrow) are present. Fig. 17, Higher magnification (relative to Fig. 16) thin-section photomicrograph of mediumto coarse-grained aeolian dune foreset sandstone in well Q03/08.

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