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The Flora Field, Blocks 31/26a, 31/26c, UK North Sea

By
R. D. Hayward
R. D. Hayward
Amerada Hess E&P, 33 Grosvenor Place, London SW1X 7HY, UK
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C. A. L. Martin
C. A. L. Martin
Amerada Hess E&P, 33 Grosvenor Place, London SW1X 7HY, UK
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D. Harrison
D. Harrison
Amerada Hess E&P, 33 Grosvenor Place, London SW1X 7HY, UK
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G. Van Dort
G. Van Dort
Amerada Hess E&P, 33 Grosvenor Place, London SW1X 7HY, UK
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S. Guthrie
S. Guthrie
Amerada Hess E&P, 33 Grosvenor Place, London SW1X 7HY, UK
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N. Padget
N. Padget
Amerada Hess E&P, 33 Grosvenor Place, London SW1X 7HY, UK
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Published:
January 01, 2003

Abstract

The Flora Field straddles Blocks 31/26a and 31/26c of the UK sector of the North Sea on the southern margin of the Central Graben. The field is located on the Grensen Nose, a long-lived structural high, and was discovered by the Amerada Hess operated well 31/26a-12 in mid-1997.

The Flora Field accumulation is reservoired within the Flora Sandstone, an Upper Carboniferous fluvial deposit, and a thin Upper Jurassic veneer, trapped within a tilted fault block. Oil is sourced principally from the Kimmeridge Clay Formation of the Central Graben and is sealed by overlying Lower Cretaceous marls and Upper Cretaceous Chalk Group.

Reservoir quality is generally good with average net/gross of 85% and porosity of 21%, although permeability (Kh) exhibits a great deal of heterogeneity with a range of 0. 1 to >10 000mD (average 300 mD). The reservoir suffers both sub-horizontal (floodplain shales) and vertical (faults) compartmentalization, as well as fracturing and a tar mat at the oil-water contact modifying flow and sweep of the reservoir. Expected recoverable reserves currently stand at 13 MMBBL.

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Contents

Geological Society, London, Memoirs

United Kingdom Oil and Gas Fields Commemorative Millennium Volume

J. G. Gluyas
J. G. Gluyas
Acorn Oil Gas Ltd, Staines, Middlesex, UK
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H. M. Hichens
H. M. Hichens
Oil and Gas Directorate, London, UK
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Geological Society of London
Volume
20
ISBN electronic:
9781862393950
Publication date:
January 01, 2003

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