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Environmental monitoring survey of oil and gas fields in Region II in 2009. Summary report

Abstract

The oil companies Statoil ASA, ExxonMobil Exploration and Production Norway AS, Total E&P Norge AS, Talisman Energy Norge AS and Marathon Petroleum Norge AS commissioned Section of Applied Environmental Research at UNI RESEARCH AS to undertake the monitoring survey of Region II in 2009. Similar monitoring surveys in Region II have been carried out in 1996, 2000, 2003 and 2006. The survey in 2009 included in total 18 fields: Rev, Varg, Sigyn, Sleipner Vest, Sleipner OEst, Sleipner Alfa Nord, Glitne, Grane, Balder, Ringhorne, Jotun, Vale, Skirne, Byggve, Heimdal, Volve, Vilje og Alvheim. Sampling was conducted from the vessel MV Libas between May 18 and May 27. Samples were collected from in totally 137 sampling sites, of which 15 were regional sampling sites. Samples for chemical analysis were collected at all sites, whereas samples for benthos analysis were collected at 12 fields. As in previous surveys, Region II is divided into natural sub-regions. One sub-region is shallow (77-96 m) sub-region, a central sub-region (107-130 m) and a northern subregion (115-119 m). The sediments of the shallow sub-region had relatively lower content of TOM and pelite and higher content of fine sand than the central and northern sub-regions. Calculated areas of contamination  More>>
Publication Date:
Mar 15, 2010
Product Type:
Technical Report
Report Number:
NEI-NO-1707
Subject:
02 PETROLEUM; 03 NATURAL GAS; WATER POLLUTION; OFFSHORE SITES; SEAS; MONITORING; ENVIRONMENTAL IMPACTS; OIL FIELDS; RESOURCE EXPLOITATION; NORTH SEA
OSTI ID:
1005103
Research Organizations:
Klima- og forurensningsdirektoratet, Oslo (Norway)
Country of Origin:
Norway
Language:
English
Other Identifying Numbers:
TRN: NO1105015
Availability:
Commercial reproduction prohibited; OSTI as DE01005103
Submitting Site:
NW
Size:
18 p. pages
Announcement Date:
Mar 07, 2011

Citation Formats

None. Environmental monitoring survey of oil and gas fields in Region II in 2009. Summary report. Norway: N. p., 2010. Web.
None. Environmental monitoring survey of oil and gas fields in Region II in 2009. Summary report. Norway.
None. 2010. "Environmental monitoring survey of oil and gas fields in Region II in 2009. Summary report." Norway.
@misc{etde_1005103,
title = {Environmental monitoring survey of oil and gas fields in Region II in 2009. Summary report}
author = {None}
abstractNote = {The oil companies Statoil ASA, ExxonMobil Exploration and Production Norway AS, Total E&P Norge AS, Talisman Energy Norge AS and Marathon Petroleum Norge AS commissioned Section of Applied Environmental Research at UNI RESEARCH AS to undertake the monitoring survey of Region II in 2009. Similar monitoring surveys in Region II have been carried out in 1996, 2000, 2003 and 2006. The survey in 2009 included in total 18 fields: Rev, Varg, Sigyn, Sleipner Vest, Sleipner OEst, Sleipner Alfa Nord, Glitne, Grane, Balder, Ringhorne, Jotun, Vale, Skirne, Byggve, Heimdal, Volve, Vilje og Alvheim. Sampling was conducted from the vessel MV Libas between May 18 and May 27. Samples were collected from in totally 137 sampling sites, of which 15 were regional sampling sites. Samples for chemical analysis were collected at all sites, whereas samples for benthos analysis were collected at 12 fields. As in previous surveys, Region II is divided into natural sub-regions. One sub-region is shallow (77-96 m) sub-region, a central sub-region (107-130 m) and a northern subregion (115-119 m). The sediments of the shallow sub-region had relatively lower content of TOM and pelite and higher content of fine sand than the central and northern sub-regions. Calculated areas of contamination are shown for the sub-regions in Table 1.1. The fields Sigyn, Sleipner Alfa Nord, Glitne, Grane, Balder, Ringhorne, Jotun, Skirne, Byggve, Vilje og Alvheim showed no contamination of THC. At the other fields there were minor changes from 2006. The concentrations of barium increased in the central sub-region from 2006 to 2009, also at fields where no drilling had been undertaken during the last years. The same laboratory and methods are used during the three last regional investigations. The changes in barium concentrations may be due to high variability of barium concentrations in the sediments. This is supported by relatively large variations in average barium concentrations at the regional sampling sites in the central sub-region between the monitoring surveys. No contamination of other metals were observed at the fields Rev, Glitne, Grane, Balder, Jotun, Skirne and Byggve and at the other fields the concentrations were lower or stayed at the same levels as in 2006. In some cases, the sampling sites did not reach clean sediments and as a result the estimation of contaminated areas became uncertain. The composition of the benthic fauna was examined at Rev, Varg, Sigyn, Sleipner OEst, Glitne, Grane, Balder, Ringhorne, Jotun, Volve, Vilje og Alvheim. The high numbers of individuals that were observed at several regional and field specific stations in 2006, decreased in 2009 as a result of natural oscillations in the fauna. Diversity was generally high and no disturbance was observed at any of the examined fields in 2009. An extra sampling site was examined at Ringhorne in 2009, in connection to previous oil leakage from the sea-bottom. The THC-level was high at this sampling site as in 2006 and the bottom fauna was poor in 2009. However, the conditions at this site did not affect the areas that were covered by the grid of monitoring sites. (Author)}
place = {Norway}
year = {2010}
month = {Mar}
}