Clay diagenesis and oil migration in Brent Group sandstones of NW Hutton Field, UK North Sea

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Authors:Scotchman, I. C.; Johnes, L. H.; Miller, R. S.
Author Affiliations:Primary:
Amoco (U.K.) Explor., London, United Kingdom
Other:
Reservoirs, United States
Volume Title:Clay Minerals
Source:Clay Minerals, 24(2), p.339-374. Publisher: Mineralogical Society, London, United Kingdom. ISSN: 0009-8558
Publication Date:1989
Note:In English. 43 refs.; illus. incl. 5 tables, 3 plates, sketch maps
Summary:Oil is stored in these sandstones in a complex, highly faulted and tilted fault-block structure at an average depth of 12 000 ft subsea. The reservoir shows a complex diagenetic sequence. Early calcite concretions showing partial replacement by siderite occur in marine facies sandstones of the Broom and Rannoch formations. The fluvio-deltaic and marine-facies sandstones of the Etive, Ness and Tarbert formations show a secondary porosity formation by K- feldspar dissolution, followed by quartz overgrowth cementation and kaolinite and illite authigenesis. Kaolinite was concentrated on the crest of the structure with illite and quartz cements increasing down the flanks. The marine sandstones of the Broom formation, however, are kaolinite-rich with little illite. An early phase of oil migration seems to have been concurrent with the later stages of quartz overgrowth and clay mineral cementation, the later phase of migration causing diagenesis to cease in the crestal part of the field. In the down-flank areas illite cementation appears to have ceased soon after the main migration of hydrocarbon fluids into the structure. [R.E.S.]
Subjects:Bajocian; Brent Group; Cementation; Clastic rocks; Clastic sediments; Clay; Clay mineralogy; Diagenesis; Economic geology; Genesis; Jurassic; Kimmeridge Clay; Mesozoic; Middle Jurassic; Migration; Oil and gas fields; Petroleum; Porosity; Processes; Production; Reservoir rocks; Sandstone; Sedimentary rocks; Sediments; Upper Jurassic; Atlantic Ocean; Atlantic Ocean Islands; Europe; Great Britain; North Atlantic; North Sea; Scotland; Shetland Islands; United Kingdom; Western Europe; Areal studies; Hutton Field
Coordinates:N595000 N610000 W0004500 W0014500
Abstract Numbers:90M/2655
Record ID:1989080957
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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