Diagenetic controls on reservoir quality in Middle to Upper Jurassic sandstones in the South Viking Graben, North Sea

AAPG Bulletin ◽  
2011 ◽  
Vol 95 (11) ◽  
pp. 1937-1958 ◽  
Author(s):  
Tom Erik Maast ◽  
Jens Jahren ◽  
Knut Bjørlykke
Keyword(s):  
North Sea ◽  
Upper Jurassic ◽  
Reservoir Quality ◽  
The South

The T-Block Fields, Block 16/17, UK North Sea

2003 ◽  
Vol 20 (1) ◽  
pp. 369-382 ◽  
Author(s):  
M. Gambaro ◽  
V. Donagemma
Keyword(s):  
North Sea ◽  
Upper Jurassic ◽  
Production Performance ◽  
Reservoir Quality ◽  
The South ◽  
Content Type

abstractThe Tiffany, Toni, Thelma and SE Thelma fields, collectively referred to as the T-Block fields lie wholly within UK Block 16/17 at the southern end of the South Viking Graben. The four fields were discovered between 1976 and 1980 and despite the fact that they share a common reservoir, the Upper Jurassic Brac Formation, they are quite distinct in terms of their petroleum content (type), reservoir quality and production performance. This paper summarizes the characteristics of the T-Block petroleum accumulations and highlights the differences between each of the field.

The South Brae Field, Block 16/7a, UK North Sea

1991 ◽  
Vol 14 (1) ◽  
pp. 55-62 ◽  
Author(s):  
Martin J. Roberts
Keyword(s):  
North Sea ◽  
Oil Production ◽  
Upper Jurassic ◽  
The Other ◽  
Field Margins ◽  
The South ◽  
Western Margin ◽  
Recoverable Reserves ◽  
Clay Formation ◽  
Devonian Age

AbstractSouth Brae Oilfield lies at the western margin of the South Viking Graben, 161 miles northeast of Aberdeen. Oil production began in July 1983 from a single platform located in 368 ft of water. The field originally contained 312 MMBBL of recoverable reserves, and in May 1990, cumulative exports of oil and NGL reached 219 MMBBL. The reservoir lies at depths in excess of 11800 ft TVSS, has a maximum gross hydrocarbon column of 1670 ft, and covers an area of approximately 6000 acres.The reservoir is the Upper Jurassic Brae Formation which is downfaulted against tight sealing rocks of probable Devonian age at the western margin of the field. The other field margins are constrained by a combination of structural dip and stratigraphic pinchout.The reservoir is capped by the Kimmeridge Clay Formation, which is also the source of the oil.

The South Brae Field, Blocks 16/07a, 16/07b, UK North Sea

2003 ◽  
Vol 20 (1) ◽  
pp. 211-221 ◽  
Author(s):  
Keith J. Fletcher
Keyword(s):  
North Sea ◽  
Oil Production ◽  
Upper Jurassic ◽  
The Other ◽  
Field Margins ◽  
The South ◽  
Submarine Fan ◽  
Western Margin ◽  
Devonian Age

AbstractThe South Brae Oilfield lies at the western margin of the South Viking Graben, 161 miles NE of Aberdeen. Oil production began in July 1983 from a single platform located in 368 ft of water. The field STOOIP is 795 MMBBLs, and in May 1999, cumulative exports of oil and NGL reached 265 MMBBLs. The reservoir lies at depths in excess of 11 800 ft TVDss, has a maximum gross hydrocarbon column of 1670 ft, and covers an area of approximately 6000 acres.The reservoir consists of Upper Jurassic Brae Formation sandstones and conglomerates deposited as submarine fan complexes that are downfaulted against tight sealing rocks of probable Devonian age at the western margin of the field. The other field margins are constrained by a combination of structural dip and stratigraphic pinchout.

The Miller Field, Blocks 16/7B, 16/8B, UK North Sea

1991 ◽  
Vol 14 (1) ◽  
pp. 159-164 ◽  
Author(s):  
S. K. Rooksby
Keyword(s):  
North Sea ◽  
Seismic Data ◽  
Lower Cretaceous ◽  
Upper Jurassic ◽  
Oil Field ◽  
The South ◽  
Submarine Fan ◽  
Western Margin ◽  
Average Porosity ◽  
Slow Velocity

AbstractThe Miller Oil Field is located on the western margin of the South Viking Graben in UKCS Blocks 16/7b and 16/8b. The oil is trapped in Upper Jurassic turbidite sands shed from the Fladen Ground Spur via the Brae complex submarine fan systems. The reservoir sands are of good quality with an average porosity of 16% and permeabilities occasionally in excess of 1 Darcy. The trap is formed within a subtle structural-stratigraphic combination. Overlying slow velocity Lower Cretaceous sediments produce a time flat which, after depth conversion, produces a 3-way dip closed feature. The trap is completed by stratigraphic pinchout of the reservoir sands to the northwest. The most recent (1985) seismic data allow the top reservoir reflector to be picked directly, which was not the case during the exploration and appraisal phase, when only the Top Kimmeridge Clay seismic pick could be made. The estimate of recoverable hydrocarbons is currently 300 MMBBL of oil and 570 BCF of gas. Development drilling commenced early in 1989. No results are yet available.

Reservoir quality and its relationship to facies and provenance in Middle to Upper Jurassic sequences, northeastern North Sea

Clay Minerals ◽  
2000 ◽  
Vol 35 (1) ◽  
pp. 77-94 ◽  
Author(s):  
M. Ramm
Keyword(s):  
Grain Size ◽  
North Sea ◽  
Close Relationships ◽  
Upper Jurassic ◽  
Reservoir Quality ◽  
Burial History ◽  
Deep Burial ◽  
Porosity And Permeability ◽  
Reservoir Sandstones ◽  
Initial Texture

AbstractClose relationships are demonstrated between reservoir quality, lithofacies, provenance and burial history in the Jurassic Brent and Viking Groups in the Norwegian North Sea. Porosity and permeability are strongly and systematically related to the initial texture and composition of the sandstones. Porosity variations are related to the amount of compaction, which is more severe in matrix-rich than in clean facies, and quartz cementation, which is most important in clean facies. Permeability variations are related to porosity and facies-controlled variations in grain size, and abundance and texture of intergranular fines. Illitization of early diagenetic kaolins require K, which is derived mainly from dissolution of K-feldspar. Sediments were sourced from K-feldspar- poor provenances during the maximum progradation of the Brent Group, and sandstones deposited at this time are less exposed to illitization and have better permeability at deep burial than reservoir sandstones that initially contained more K-feldspar.

Sedimentological aspects of the Humber Group (Upper Jurassic) of the South Central Graben, UK North Sea

Sedimentology ◽  
1996 ◽  
Vol 43 (1) ◽  
pp. 89-114 ◽  
Author(s):  
JOHN A. HOWELL ◽  
STEPHEN S. FLINT ◽  
CATHERINE HUNT
Keyword(s):  
North Sea ◽  
Upper Jurassic ◽  
The South ◽  
South Central
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