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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