Low-Cost Monitoring Of Inter-Well Reservoir Communication Paths Through Correlations In Well Rate Fluctuations: Case Studies From Mature Fields In The North Sea

2010 ◽  
Author(s):  
Kes J. Heffer ◽  
John Greenhough ◽  
Ian Main ◽  
Xing Zhang ◽  
Assef Mohamad Hussein ◽  
...  
Keyword(s):  
Case Studies ◽  
North Sea ◽  
Low Cost ◽  
The North ◽  
The North Sea ◽  
Communication Paths

scholarly journals Inaccuracies in routinely collected Atlantic herring (Clupea harengus) maturity data and correction using a gonadosomatic index model

2011 ◽  
Vol 91 (7) ◽  
pp. 1477-1487 ◽  
Author(s):  
Lindsay R. McPherson ◽  
Konstantinos Ganias ◽  
C. Tara Marshall
Keyword(s):  
North Sea ◽  
Low Cost ◽  
Gonadosomatic Index ◽  
Clupea Harengus ◽  
Implicit Assumption ◽  
Multinomial Regression ◽  
Index Model ◽  
The North ◽  
Spawning Stock ◽  
The North Sea

Macroscopic maturity staging data are widely used to distinguish between reproductive and non-reproductive individuals. The implicit assumption is that these data are accurate. The accuracy of macroscopic maturity staging of North Sea herring (Clupea harengus) has not been checked since the macroscopic scale was produced in 1961. The aim of this study was to assess the accuracy of macroscopic maturity staging of female North Sea herring by comparison to histological staging and the gonadosomatic index (GSI). Ovary samples were collected during the North Sea Herring Acoustic Survey in 2006 on-board FRV ‘Scotia’ (Scotland) and in 2007 on-board FRV ‘Scotia’ and RV ‘Johan Hjort’ (Norway). Commercial samples were also collected by Marine Scotland, Aberdeen in both years. The maturity staging error was relatively low in 2006 (21% error) but was much higher on-board FRV ‘Scotia’ (57%) and RV ‘Johan Hjort’ (47%) in 2007. There was estimated to be a 27% under-estimation of the spawning stock biomass (SSB) in 2007 due to the differences in the proportion mature but no change in SSB estimates in 2006. GSI cut-off scores, estimated by means of multinomial regression models were successfully able to separate immature females from both mature-active and recovering females; however, there was some overlap between the mature-active and recovering individuals. We conclude that an effective and low-cost means of reducing error in herring maturity studies is the combined use of a four-point macroscopic maturity scale with routinely collected GSI data, the latter acting to validate and fine tune macroscopic staging.

A low-cost decision support network for electrocardiograph transmission from oil rigs in the North Sea

2008 ◽  
Vol 14 (3) ◽  
pp. 162-164 ◽  
Author(s):  
Karyn Webster ◽  
Susan Fraser ◽  
Fiona Mair ◽  
James Ferguson
Keyword(s):  
Decision Support ◽  
North Sea ◽  
Low Cost ◽  
Support Network ◽  
The North ◽  
The North Sea

Introduction to this special section: Case studies: Conventionals

2019 ◽  
Vol 38 (1) ◽  
pp. 10-10
Author(s):  
Shauna Oppert ◽  
Matthew Casey ◽  
Kyle T. Spikes
Keyword(s):  
Case Studies ◽  
North Sea ◽  
Reservoir Characterization ◽  
Special Section ◽  
Data Sets ◽  
The North ◽  
The North Sea ◽  
Well Data ◽  
Conventional Systems ◽  
Innovative Techniques

Case studies, with a focus on conventional systems, provide insight of seismic and well data sets in terms of characterizing reservoirs with innovative techniques and approaches. This special section contains three such papers from three different regions: offshore Brazil, the North Sea, and the Middle East. Each contribution presents a different geologic problem ranging from siliciclastics to volcanics to carbonates. The challenges faced in each paper were tackled using innovative approaches to reservoir characterization in complex geologic regions.

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