The Sean North, Sean South and Sean East Fields, Block 49/25a, UK North Sea

2003 ◽  
Vol 20 (1) ◽  
pp. 825-833 ◽  
Author(s):  
A. P. Hillier
Keyword(s):  
North Sea ◽  
The Other ◽  
Peak Shaving ◽  
Southern North Sea ◽  
Cap Rock ◽  
Sandstone Reservoir ◽  
Gas Fields ◽  
North And South ◽  
Direct Market

AbstractSean North, Sean South and Sean East are small prolific gas fields located on the Indefatigable Shelf in the Southern North Sea. They, like most of the other fields in the area, have a Carboniferous source, a Rotliegend aeolian sandstone reservoir and a Zechstein evaporite cap rock. Sean North and South have been developed to fulfil a peak-shaving role, being produced for only a few days per year in times of high gas demand when they can produce at rates of up to 600 MMSCF/D. East Sean is sold to the direct market. Reserves for the fields are 234 BCF (North), 488 BCF (South) and 127 BCF (East).

The Sean North and Sean South Fields, Block 49/25a, UK North Sea

1991 ◽  
Vol 14 (1) ◽  
pp. 485-490 ◽  
Keyword(s):  
North Sea ◽  
Material Balance ◽  
The Other ◽  
Peak Shaving ◽  
Southern North Sea ◽  
Recoverable Reserves ◽  
Cap Rock ◽  
Sandstone Reservoir ◽  
Gas Fields

AbstractSean North and Sean South are two small prolific gas fields located on the Indefatigable Shelf in the Southern North Sea. They, like most of the other fields in the area, have a Carboniferous source, a Rotliegend aeolian sandstone reservoir and a Zechstein evaporite cap rock. They have been developed to fullfil a peak-shaving role, being produced for only a few days per year in times of high gas demand when they produce at a rate of 600 MMSCFD. Initially thought to be two equally sized accumulations, there is now some evidence from material balance calculations that the Sean South is bigger than North Sean. The contractual recoverable reserves for the two fields are 425 BCF.

scholarly journals Exploring the Trophic Spectrum: Placing Mixoplankton Into Marine Protist Communities of the Southern North Sea

2020 ◽  
Vol 7 ◽  
Author(s):  
Lisa K. Schneider ◽  
Kevin J. Flynn ◽  
Peter M. J. Herman ◽  
Tineke A. Troost ◽  
Willem Stolte
Keyword(s):  
Time Series ◽  
Total Nitrogen ◽  
North Sea ◽  
Principle Component Analysis ◽  
Current Knowledge ◽  
The Other ◽  
Southern North Sea ◽  
Long Time ◽  
Plankton Communities

While traditional microplankton community assessments focus primarily on phytoplankton and protozooplankton, the last decade has witnessed a growing recognition of photo-phago mixotrophy (performed by mixoplankton) as an important nutritional route among plankton. However, the trophic classification of plankton and subsequent analysis of the trophic composition of plankton communities is often subjected to the historical dichotomy. We circumvented this historical dichotomy by employing a 24 year-long time series on abiotic and protist data to explore the trophic composition of protist communities in the Southern North Sea. In total, we studied three different classifications. Classification A employed our current knowledge by labeling only taxa documented to be mixoplankton as such. In a first trophic proposal (classification B), documented mixoplankton and all phototrophic taxa (except for diatoms, cyanobacteria, and colonial Phaeocystis) were classified as mixoplankton. In a second trophic proposal (classification C), documented mixoplankton as well as motile, phototrophic taxa associated in a principle component analysis with documented mixoplankton were classified as mixoplankton. In all three classifications, mixoplankton occurred most in the inorganic nutrient-depleted, seasonally stratified environments. While classification A was still subjected to the traditional dichotomy and underestimated the amount of mixoplankton, our results indicate that classification B overestimated the amount of mixoplankton. Classification C combined knowledge gained from the other two classifications and resulted in a plausible trophic composition of the protist community. Using results of classification C, our study provides a list of potential unrecognized mixoplankton in the Southern North Sea. Furthermore, our study suggests that low turbidity and the maturity of an ecosystem, quantified using a newly proposed index of ecosystem maturity (ratio of organic to total nitrogen), provide an indication on the relevance of mixoplankton in marine protist communities.

The Viking Complex Field, Blocks 49/12a, 49/16, 49/17, UK North Sea

1991 ◽  
Vol 14 (1) ◽  
pp. 509-515
Author(s):  
C. P. Morgan
Keyword(s):  
North Sea ◽  
Complex Field ◽  
Early Permian ◽  
Daily Production ◽  
Entire Field ◽  
Seasonal Demand ◽  
Southern North Sea ◽  
Recoverable Reserves ◽  
Gas Bearing ◽  
North And South

AbstractThe Viking complex consists of several separate gas accumulations within Blocks 49/12a, 49/16 and 49/17 of the southern North Sea. The entire field is located on the northeast flank of the Sole Pit Basin, approximately 140 km off the Lincolnshire coast. North Viking was discovered in March 1969; South Viking was discovered in December 1968. Conoco (UK) Ltd operates the Viking complex on behalf of BP. North and South Viking consist of two parallel elongated faulted anticlines trending NW-SE. The gas-producing structures are largely fault controlled. The reservoir comprises Rotliegendes Group sands of Early Permian age. The gas-bearing Rotliegendes consists of stacked aeolian and fluvial sands with a gross thickness range of 430-720 ft (131-222 m, thickest on South Viking). Porosities range from 7-25% and the average permeability range is 0.1 md to over 1000 md in the producing zones. The total Viking gas-in-place is almost 3.2 TCF, with recoverable reserves estimated at 2.83 TCF. North Viking came onstream in October 1972 and is developed by a five-platform complex. South Viking came onstream in August 1973 and is developed by a three-platform complex into which are linked five unmanned satellite platforms. The average daily production in March 1989 was 196 MMSCFD, peaking to 311 MMSCFD with seasonal demand. Gas is piped to the Conoco/BP terminal at Theddlethorpe in Lincolnshire.

The V-Fields, Blocks 49/16, 49/21/, 48/20a, 48/25b, UK North Sea

2003 ◽  
Vol 20 (1) ◽  
pp. 861-870
Author(s):  
James Courtier ◽  
Hugh Riches
Keyword(s):  
North Sea ◽  
Early Permian ◽  
The North ◽  
Recoverable Reserves ◽  
Production Wells ◽  
Exploration Drilling ◽  
Structural Relief ◽  
The Uk ◽  
Gas Fields ◽  
North And South

AbstractThe Vulcan, Vanguard, North and South Valiant gas fields are collectively known as the V-Fields and lie on the eastern flank of the Sole Pit Basin in the southern sector of the UK North Sea. They are contained within blocks 49/16, 49/21, 48/20a and 48/25b and are operated by Conoco (UK) Ltd. The first field to be discovered was South Valiant, in 1970, and the initial phase of exploration drilling continued until 1983, with the discovery of the North Valiant, Vanguard and Vulcan fields. Prominent faults and dip closures define the limits of the fields and gas is contained within aeolian sands of Early Permian age. The gross average reservoir thickness is approximately 900 ft with porosities ranging from 3-23% and permeabilities varying from 0.1 mD to 2 Darcies in producing zones. The development of the V-Fields consisted of drilling centrally located production wells in each field, targeting higher quality reservoir zones in areas of maximum structural relief. Initial gas-in-place is estimated at 2.6 TCF with recoverable reserves of about 1.6 TCF. The fields were brought on-stream in October 1988 and currently produce, as of November 1999, up to 260MMSCFD of gas through the LOGGS complex to the Conoco terminal at Theedle-thorpe, Lincolnshire.

Severe Wave Conditions at Sea

1971 ◽  
Vol 24 (3) ◽  
pp. 273-277 ◽  
Author(s):  
Laurence Draper
Keyword(s):  
Wave Height ◽  
North Sea ◽  
The Other ◽  
Sea Waves ◽  
Fixed Length ◽  
Southern North Sea ◽  
Wide Range ◽  
Casual Observer ◽  
The Waves ◽  
Vast Range

Perhaps the most surprising thing about sea waves is that they come in a vast range of shapes and sizes. The casual observer on a ship in waters not exposed to an ocean, for example the southern North Sea, may rightly think that the waves he can see have all been generated by the same wind blowing over some particular stretch of water for a fixed length of time. It then seems almost logical to deduce that all the waves ought to be of the same height, length and shape. Unfortunately this is not the case, the energy of sea waves is locked in wave components spread over a wide range of wave periods, each of which travels at a speed dictated by its period. Considering the very simple case of a sea with only wave components, when a crest of one component overtakes the other, a higher wave will ensue. As a result of this process, high waves come in groups; during the time in which the components gradually get into phase the wave height builds up giving a train of waves of increasing, which then decreases as the faster component travels away, until when they are out of phase the sea is temporarily fairly calm. This is the reason why it is commonly said that every seventh wave is the highest, although whether it is every fourth or every fourteenth depends on the relative speeds of the components.

Flavour and hydrocarbon assessment of fish from gas fields in the Southern North Sea

1990 ◽  
Vol 6 (4) ◽  
pp. 263-277 ◽  
Author(s):  
J.G. Parker ◽  
P. Howgate ◽  
P.R. Mackie ◽  
A.S. McGill
Keyword(s):  
North Sea ◽  
Southern North Sea ◽  
Gas Fields
Sign in / Sign up

Export Citation Format

Share Document