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Geological Society, London, Special Publications; 1992; v. 62; p. 111-144;
DOI: 10.1144/GSL.SP.1992.062.01.11
© 1992 Geological Society of London

The Hebridean Basins and Adjacent Areas

Mid-Jurassic lagoonal delta systems in the Hebridean basins: thickness and facies distribution patterns of potential reservoir sandbodies

J. P. Harris

Department of Geology, University of Leicester, University Road, Leicester LE1 7RH, UK
Simon-Robertson, Llandudno, Gwynedd, N Wales LL30 1SA
Simon-Robertson, Llandudno, Gwynedd, N Wales LL30 1SA

In the Inner Hebrides the facies distribution patterns and mineralogy of outcropping Great Estuarine Group (Bathonian) sandbodies indicate SSW progradation of copiously supplied lagoonal deltas in two sub-basins (Sea of the Hebrides Basin and Inner Hebrides Basin). These were both westerly tilted half graben and were probably separated by a slowly subsiding basement ridge known as the mid-Skye palacohigh. In the Bathonian these basins had an intermittent connection with the open sea and were supplied with clastic sediment from mineralogically distinct source areas in the Scottish Landmass to the east and an Outer Hebrides Landmass to the west. Fluvial-dominated and fluvial-wave interaction deltas supplied by low sinuosity rivers form successive sandbodies intercalated with lagoonal mudstones. The facies distribution patterns and mappable depositional limits of these sandbodies are dependent on the style and rate of fluvial supply, the configuration of the basins, variations in wave energy and salinity fluctuations. This demonstrates concepts which are probably applicable to the prediction of reservoir thickness and facies patterns in related sedimentary basins.