380
Views
53
CrossRef citations to date
0
Altmetric
Original Articles

Water Column Monitoring of the Biological Effects of Produced Water from the Ekofisk Offshore Oil Installation from 2006 to 2009

, , , , , , , , , , & show all
Pages 582-604 | Published online: 09 Mar 2011
 

Abstract

The Norwegian water column monitoring program investigates the biological effects of offshore oil and gas activities in Norwegian waters. In three separate surveys in 2006, 2008, and 2009, bioaccumulation and biomarker responses were measured in mussels (Mytilus edulis) and Atlantic cod (Gadus morhua) held in cages at known distances from the produced water (PW) discharge at the Ekofisk oil field. Identical monitoring studies performed in all three years have allowed the biological effects and bioaccumulation data to be compared, and in addition, enabled the potential environmental benefits of a PW treatment system (CTour), implemented in 2008, to be evaluated. The results of the 2009 survey showed that caged animals were exposed to low levels of PW components, with highest tissue concentrations in mussels located closest to the PW discharge. Mussels located approximately 1–2 km away demonstrated only background concentrations of target compounds. Concentrations of polycyclic aromatic hydrocarbons (PAH) and alkyl phenol (AP) metabolites in the bile of caged cod were elevated at stations 200–250 m from the discharge. There was also a signal of exposure relative to discharge for the biomarkers CYP1A in fish and micronuclei in mussels. All other fish and mussel biomarkers showed no significant exposure effects in 2009. The mussel bioaccumulation data in 2009 indicated a lower exposure to the PW effluent than seen previously in 2008 and 2006, resulting in an associated general improvement in the health of the caged mussels. This was due to the reduction in overall discharge of PW components (measured as oil in water) into the area in 2009 compared to previous years as a result of the improved PW treatment system.

Acknowledgments

The work was funded by the Norwegian Oil industry Association (OLF). The authors thank Steinar Berntsen, Eimund Garpestad, and Harald Lura representing the operator at Ekofisk (ConocoPhillips), Kjell Birger Øysæd, Atle Nævdal, Lars Petter Myhre, Jan Fredrik Børseth, and Daniela Pampanin from IRIS, and Sigurd Øxnevad, Anja Julie Nilsen, Inger Katharina Gregersen, Oscar Fogelberg, Tor Fredrik Holth, Kenneth Macrae, and Kevin Thomas from NIVA. Bjørn Serigstad (Seamon a/s) and Dag Altin (Biotrix) are acknowledged for field assistance. We are also indebted to the fish supplier, the crew at the vessel Seigrunn, and the laboratory personnel at Ekofisk.

Notes

Reprints and Corporate Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

To request a reprint or corporate permissions for this article, please click on the relevant link below:

Academic Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

Obtain permissions instantly via Rightslink by clicking on the button below:

If you are unable to obtain permissions via Rightslink, please complete and submit this Permissions form. For more information, please visit our Permissions help page.