GENERAL GEOLOGY KIMMERIDGE BAY Group 1: Ole Jørgen Morten Olumide Yu Huijuan Zein Wijaya

Kimmeridge Oil Field Discovered in wells drilled,1 producing 80bbl/d Fractured Cornbrash limestone Total prod until today:3,5 mill bbl.

Structure of Kimmeridge oilfield Purbeck Reversed fault Fault trend is East-West direction. Trap is faulted anticline

Structure Evolution of Kimmeridge oilfield

Kimmeridge clay Immature source rock in Kimmeridge Bay Kimmeridge clay is black shale with % TOC Main source rock in the North Sea

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PETROX 2005 Group 1 Morten Lorentzen Ole Jørgen Birkenes Olumide Gbadamosi Huijuan Yu Wijaya Zein

Wessex Basin Includes the largest known onshore oilfield in W-Europe Preservation of oil-accumulations originally sited in Mesozoic tilted fault-blocks.

Key elements in petroleum geology Source Reservoir Seal Trap Timing Maturation Migration

Source Rock Features in West Cliff Lyme Regis. Marine environment (grey colour). Early Jurassic age. Organic sedimentary deposits which forms the hydrocarbon under right conditions. Laminated shale deposit with many fossils. Low oxygen environment. 6% organic contents Organic type: Kerogen II Dips at 2 degrees to the East. Limestone (wackestone) Black Shale (mudstone) Limestone (wackestone) Black Shale (mudstone)

Geological Log Interpretation For WestCliff source rock Limestone, porosity :5-10% Shale, porosity :2%

Sherwood sandstone Triassic Colour High porosity Dip,5-10 deg East Fault

Sandstone with thin shalelayers Porosity between 30-40%

Oil Migration