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

By Michael Ashton, Geological Society of London

ISBN-10: 0903317842

ISBN-13: 9780903317849

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E. • VAN WEERING, TJ. C. E. (eds) 1981. Holocene Marine Sedimentation in the North Sea Basin. International Association of Sedimentologists, Special Publication, 5, Blackwells, Oxford. NIO, S. D. & YANG, C. S. 1989. Recognition of tidally-influenced facies and environments, Short course notes series No. l, International Geoservices BV. & 1991a. Sea level fluctuations and the geometric variability of tide-dominated sand bodies. Sedimentary Geology, 70, 161-193. & -199lb. Diagnostic attributes of clastic tidal deposits--a review.

Figures 15 and 19 indicate increased development of authigenic illite in well Q02 relative to Q05. This reaction probably occurred after conversion of most of the available chlorite to illite. Formation of authigenic illite cannot accommodate all the K20 released by K-feldspar dissolution, leading to a net loss of K20 from the system (reaction 1). KAISi308 + 2/3 H2CO 3 = 1/3KA12(Si3A1OI0)(OH)2 + 2SiO 2 + 2/3K + + 2/3HCO 3- (1) The progressive loss of K20 from the system, the low K-feldspar content, and the very low chlorite/illite ratio suggest that much of the K-feldspar originally present in wells Q02 and Q04 was converted to authigenic illite.

Two end-member mineralogical assemblages are identified which are closely linked to reservoir quality. High porosity wells contain a chlorite-Kfeldspar-quartz-dolomite assemblage while low porosity wells contain an illitequartz-ankerite assemblage. Empirical evidence shows that porosity loss is associated with conversion of K-feldspar, chlorite and dolomite to illite and ankerite, and is due to compaction rather than cementation. Post-depositional faults acted as conduits for fluid which altered mineralogy, removed soluble components and, in one case, introduced anhydrite cement.

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