the field experience
TRANSCRIPT
8/3/2019 The Field Experience
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The Field Experience
The Critical Evaluation of the
Petroleum System of the WessexBasin
Mohammed Surty
2508892MSc Petroleum Engineering
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Content
• Aims
• Plan of Action
• Wessex Basin
• Wytch Farm
• Bridport Sands
• Stair Hole, Lulworth Cove
• Kimmeridge Clays
• Conclusion
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AIMS
• What we aimed to achieve?
•What did we do?
• Why did we want to find? – Grain Size
– Sorting – Source rocks? Reservoir Rocks?
– Plays and Migration?
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The Plan of Action
• DAY 1 –
Wytch Farm Oil Field
• DAY 2 –
Bridport Sands,
Stair Hole,
Kimmeridge Clays
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Overview – Wessex Basin
• Location
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Stratigraphy
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Wessex Basin
• Source rocks –
Kimmeridge clay,
OxfordLower Lias
• Reservoir rocks –
SherwoodBridport
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Day 1- Wytch Farm Oil Field
• Development – Stage 1 Started in 1979
– Infill drilling started in 1998 – still ongoing
• Production & RecoveryProduction grew from 4,000 to 6,000 barrels per day
(950 m3/d) (bpd) by 1984
Eventually peaked at 110,000 bbl/d (17,000 m3/d) in1997;
By 2002 this had declined to 50,000 bbl/d(7,900 m3/d). In 2002 it was estimated that the field containedreserves of 65.40 million tonnes of oil (479.6 million barrels),4.73 million tonnes
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Wytch Farm Oil Field
• Challenges
– SSSI (sites of special specific interest
– World Heritage Coastline
– National Trust Land
• Environmental Conservation
– What measures were taken
– Queens Award
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Day 2 – Bridport Sands
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Bridport
• Alternating beds
• Well sorted
•
Low clay content• Porosity 32%
• Permeability – 300mD
• High energy marine depositional environment
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Stair Hole
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Kimmeridge Clays
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Kimmeridge Clays
• Main oil shale
• Low porosity
•
Fine to medium fine• Well sorted
• Laminars
• Fossils present• Greatest potential
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Conclusion
• Wytch Farm Oil Field is the largest onshore
field in Western Europe
• A great example of an environmentally
friendly oil field
• The effects of plays and migration
• We can see how faults, laminars and
environment effect oil flow
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Conclusion
• Great working in teams
•
Better knowledge of Petroleum System
• First hand experience
Thank you for listening