10.6084/m9.figshare.12221306.v1 J. WILSON J. WILSON G. WALL G. WALL H. J. KLOOSTERMAN H. J. KLOOSTERMAN D. CONEY D. CONEY G. CAYLEY G. CAYLEY J. WALKER J. WALKER C. LINSKAILL C. LINSKAILL South Halibut Basin of the Moray Firth core displays Geological Society of London 2020 argillaceous material impedance contrast Moray Firth core displays fluid contacts sandstone Kopervik section 250 ft section turbidity currents heterolithic section 250 ft 12 ft section South Halibut Basin 36 ft deep-water gravity-driven sedimentation debris flows hydrocarbon indicator pre-drill lower-density turbitity currents Geology 2020-04-30 14:01:57 Journal contribution https://geolsoc.figshare.com/articles/journal_contribution/South_Halibut_Basin_of_the_Moray_Firth_core_displays/12221306 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.