Geological Characterization of the Hydraulically-Connected Bunter Sandstone Formation Saline Aquifer in the Southern North Sea

AbstractThe Hewett Field has been in production for some 50 years. Unusually for a Southern North Sea field in the UK Sector, there has been production from several different reservoirs and almost entirely from intervals younger than the principal Leman Sandstone Formation (LSF) reservoir in the basin. Some of these reservoirs are particular to the Hewett area. This reflects the location of the field at the basin margin bound by the Dowsing Fault Zone, which has influenced structural evolution, deposition and the migration of hydrocarbons. The principal reservoirs are the Permo-Triassic Hewett Sandstone (Lower Bunter), Triassic Bunter Sandstone Formation (BSF) (Upper Bunter) and Permian Zechsteinkalk Formation. There has also been minor production from the Permian Plattendolomit Formation and the LSF. Sour gas is present in the BSF only. Several phases of field development are recognized, ultimately comprising three wellhead platforms with production from 35 wells. Gas is exported onshore to Bacton, where the sour gas was also processed. Peak production was in 1976 and c. 3.5 tcf of gas has been recovered. Hewett has also provided the hub for six satellite fields which have produced a further 0.9 tcf of gas. It is expected that the asset will cease production in 2020.

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The Victor Field, Blocks 49/17, 49/22, UK North Sea

Geological Society London Memoirs ◽

10.1144/gsl.mem.1991.014.01.63 ◽

1991 ◽

Vol 14 (1) ◽

pp. 503-508 ◽

Cited By ~ 1

Author(s):

Robert A. Lambert

Keyword(s):

North Sea ◽

Early Permian ◽

Gas Field ◽

Eastern Flank ◽

Southern North Sea ◽

Recoverable Reserves ◽

Fault Block ◽

Sandstone Formation

AbstractThe Victor gas field lies in the Southern North Sea Gas Province on the eastern flank of the Sole Pit Basin. The field straddles Blocks 49/17 and 49/22, and is situated approximately 140 km off the Lincolnshire coast. Victor was discovered in April 1972 and is operated by Conoco (UK) Ltd on behalf of BP, Mobil and Statoil. The structure is an elongated tilted fault block, trending NW-SE. The reservoir sands are contained in the Leman Sandstone Formation (Rotliegendes Group) of Early Permian age, and consist mainly of stacked aeolian and fluvial sands with a gross thickness of 400-450 ft across the field. Porosities vary from 16-20%, with permeabilities ranging from 10 md to 1000 md in the producing zones. Initial gas in place is estimated at about 1.1 TCF with recoverable reserves of the order of 900 BCF. The field was brought on-stream in October 1984, and the five producing wells deliver, on average, 200 MMSCFD through the Viking Field 'B Complex' to the Conoco/BP terminal at Theddlethorpe in Lincolnshire

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The Rotliegendes sandstone formation of the United Kingdom sector of the southern North Sea basin

International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts ◽

10.1016/0148-9062(74)92424-3 ◽

1974 ◽

Vol 11 (1) ◽

pp. A25

Keyword(s):

United Kingdom ◽

North Sea ◽

Southern North Sea ◽

The United Kingdom ◽

Sandstone Formation

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The Gawain Field, Blocks 49/24, 49/29a, UK North Sea

Geological Society London Memoirs ◽

10.1144/gsl.mem.2003.020.01.58 ◽

2003 ◽

Vol 20 (1) ◽

pp. 713-722

Author(s):

R. A. Osbon ◽

O. C. Werngren ◽

A. Kyei ◽

D. Manley ◽

J. Six

Keyword(s):

North Sea ◽

Early Permian ◽

Water Contact ◽

Field Development ◽

Dune Sands ◽

Southern North Sea ◽

Recoverable Reserves ◽

Structural Relief ◽

Sandstone Formation

AbstractThe Gawain Field is located on the Inde shelf in the Southern North Sea, 85 km NE of the Norfolk coast. Gawain was discovered in 1970 by well 49/29-1 and a total of nine wells have been drilled on the structure. Gas is produced from the Leman Sandstone Formation of Early Permian age. The reservoir section is comprised predominantly of stacked aeolian dune sands possessing excellent poroperm characteristics. The structure is a complex NW-SE trending horst block with a common gas-water contact at 8904 ft TVDss. Low structural relief has presented a major challenge to field development, which has utilized extended reach wells to maximize drainage potential. Initial gas-in-place is estimated at 289 BCF with recoverable reserves in the order of 196 BCF. The field came on production in September 1995 via a sub-sea tie back to the Thames infrastructure and has an expected field life of 10 years

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Ravenspurn South Field, Blocks 42/29, 42/30, 43/26, UK North Sea

Geological Society London Memoirs ◽

10.1144/gsl.mem.1991.014.01.58 ◽

1991 ◽

Vol 14 (1) ◽

pp. 469-475 ◽

Cited By ~ 4

Author(s):

R. D. Heinrich

Keyword(s):

North Sea ◽

Reservoir Quality ◽

Desert Environment ◽

Gas Field ◽

Field Development ◽

Southern North Sea ◽

Fluvial Processes ◽

Sandstone Formation ◽

Aeolian Sands

AbstractThe Ravenspurn South Gas Field is located in the Sole Pit Basin of the Southern North Sea in UKCS Block 42/30, extending into Blocks 42/29 and 43/26. The gas is trapped in sandstones of the Permian Lower Leman Sandstone Formation, which was deposited by aeolian and fluvial processes in a desert environment. Reservoir quality is poor, and variations are mostly facies-controlled. The best reservoir quality occurs in aeolian sands wth porosities of up to 23% and permeabilities up to 90 md. The trap is a NW-SE-striking faulted anticline: top seal is provided by the Silverpit Shales directly overlying the reservoir, and by Zechstein halites. Field development began early in 1988 and first gas was delivered in October 1989. Production is in tandem with the Cleeton Field, about 5 miles southwest of Ravenspurn South, as the Villages project. Initial reserves are 700 BCF and field life is expected to be 20 years.

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The Guinevere Field, Block 48/17b, UK North Sea

Geological Society London Memoirs ◽

10.1144/gsl.mem.2003.020.01.59 ◽

2003 ◽

Vol 20 (1) ◽

pp. 723-730 ◽

Cited By ~ 1

Author(s):

M. Lappin ◽

D. J. Hendry ◽

I. A. Saikia

Keyword(s):

Fault Zone ◽

North Sea ◽

Production System ◽

Early Permian ◽

Gas Field ◽

East Anglia ◽

Southern North Sea ◽

Fault Block ◽

Sandstone Formation ◽

The Uk

AbstractThe Guinevere Gas Field was discovered in January 1988 by the Mobil-operated well 48/17b-5. The field lies in the UK Sector of the Southern North Sea and occupies Block 48/17b. The field is located within the footwall of the Dowsing Fault Zone on the western flank of the Sole Pit Basin. Guinevere is a compressional northwesterly-trending fault block that comprises Early Permian Leman Sandstone Formation (Rotliegend Group) reservoir, sourced from the Carboniferous below and sealed by Later Permian Zechstein evaporates above.The Guinevere Gas Field is estimated to contain 90 BCF of recoverable gas reserves and was brought on-stream in June 1993 using a single not-normally-manned minimum facilities platform. Field life is predicted to be 13 years. Gas and condensate are evacuated though the Lancelot Area Production System (LAPS) to the onshore Bacton gas terminal in East Anglia.

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The Esmond, Forbes and Gordon Fields, Blocks 43/8a, 43/13a, 43/15a, 43/20a, UK North Sea

Geological Society London Memoirs ◽

10.1144/gsl.mem.1991.014.01.53 ◽

1991 ◽

Vol 14 (1) ◽

pp. 425-432 ◽

Cited By ~ 7

Author(s):

F. J. Ketter

Keyword(s):

North Sea ◽

Arid Environment ◽

Gas Production ◽

Alluvial Fan ◽

Southern North Sea ◽

Offshore Installations ◽

Porosity And Permeability ◽

Sandstone Formation ◽

The Uk

AbstractThe three separate fields, Esmond, Forbes and Gordon form the Esmond Gas Complex in Quadrant 43 in the UK Southern North Sea. The Bunter Sandstone Formation is the reservoir in each of the separate, seismically defined, simple, anticlinal structures. The Bunter Sandstone correlates well across the three structures and is composed of a 400-500 ft thick interval containing individual channel sandstones deposited in an arid environment on an alluvial fan. Porosity and permeability are controlled by original texture and by subsequent diagenesis. Reservoir communication within the Bunter reservoir is good though locally tortuous.First gas production started in July 1985. Four offshore installations have allowed gas to be produced at full contract (plateau) rates of 200 MMSCFD without major interruption. Ultimate sales gas reserves are approximately 530 BCF.

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