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Kimmeridge Oil Field
• Discovered in 1959• 6 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
Kimmeridge clay
• Immature source rock in Kimmeridge Bay
• Kimmeridge clay is black shale with 30-40% TOC
• Main source rock in the North Sea
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 InterpretationFor WestCliff source rock
Limestone, porosity :5-10%
Shale, porosity :2%