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South Halibut Basin of the Moray Firth core displays

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journal contribution
posted on 30.04.2020 by J. WILSON, G. WALL, H. J. KLOOSTERMAN, D. CONEY, G. CAYLEY, J. WALKER, C. LINSKAILL
Three continuous sections of core are displayed - all interpreted to be the result of deep-water gravity-driven sedimentation (turbidity currents and debris flows). The upper section (12 ft) occurs in the middle of a 250 ft section of massive, relatively featureless sandstone interpreted to be dominated by high-density turbidites. These occur at the top of the Kopervik section and form the bulk of the gas/condensate-bearing reservoir. The 12 ft section illustrates both massive sandstone (most representative of the gross 250 ft upper section) and laminated sandstones, interpreted as the tails of lower-density turbitity currents. The lower continuous sections (24 ft and 36 ft respectively) contain more chaotic argillaceous material and are interpreted as comprising more locally derived debris-flows. This overall heterolithic section is interpreted as being relatively flat-lying and contains the fluid contacts in the core of the field. The impedance contrast near the top of the unit is interpreted to have generated the 'flat-event' interpreted as a direct hydrocarbon indicator pre-drill.

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