Haklang SERPENT visit report
Haklang SERPENT visit report
The SERPENT project made two visits to the Transocean Leader semisubmersible drilling rig to study
seabed disturbance at the Statoil operated Haklang prospect in the Norwegian Sea in the autumn of 2008.
Seabed depth at Haklang was 1250m and the water temperature was -1?C.
Using the Oceaneering Magnum ROV seabed disturbance was assessed by visual observations and
sediment sampling immediately after drilling impact. Megafaunal community observations were used to
determine the ecological changes. Video showed a cuttings pile with complete coverage of the seabed and
absence of megafauna extending 25-55m from the well. Beyond this seabed coverage was heterogeneous
with cuttings visible to at least 100m to the north west. Mean megafaunal abundance was low to a distance
of 40 m. Cerianthids were the dominant organisms and were present closer to the well than other taxa,
perhaps because of their burrowing habit. The longer term effects of this disturbance are unclear.
In addition specimens of the invertebrate megafauna were collected at Haklang.
National Oceanography Centre
Gates, A.R.
327a3cc6-2e53-4090-9f96-219461087be9
Jones, D.O.B.
44fc07b3-5fb7-4bf5-9cec-78c78022613a
July 2010
Gates, A.R.
327a3cc6-2e53-4090-9f96-219461087be9
Jones, D.O.B.
44fc07b3-5fb7-4bf5-9cec-78c78022613a
Gates, A.R. and Jones, D.O.B.
(2010)
Haklang SERPENT visit report
(National Oceanography Centre Southampton Research and Consultancy Report, 72)
Southampton, UK.
National Oceanography Centre
29pp.
Record type:
Monograph
(Project Report)
Abstract
The SERPENT project made two visits to the Transocean Leader semisubmersible drilling rig to study
seabed disturbance at the Statoil operated Haklang prospect in the Norwegian Sea in the autumn of 2008.
Seabed depth at Haklang was 1250m and the water temperature was -1?C.
Using the Oceaneering Magnum ROV seabed disturbance was assessed by visual observations and
sediment sampling immediately after drilling impact. Megafaunal community observations were used to
determine the ecological changes. Video showed a cuttings pile with complete coverage of the seabed and
absence of megafauna extending 25-55m from the well. Beyond this seabed coverage was heterogeneous
with cuttings visible to at least 100m to the north west. Mean megafaunal abundance was low to a distance
of 40 m. Cerianthids were the dominant organisms and were present closer to the well than other taxa,
perhaps because of their burrowing habit. The longer term effects of this disturbance are unclear.
In addition specimens of the invertebrate megafauna were collected at Haklang.
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Published date: July 2010
Additional Information:
Deposited at the request of the author
Organisations:
Marine Biogeochemistry
Identifiers
Local EPrints ID: 160921
URI: http://eprints.soton.ac.uk/id/eprint/160921
PURE UUID: 7969c22a-b1ce-4461-8207-25c6814f456f
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Date deposited: 21 Jul 2010 12:26
Last modified: 09 Apr 2024 16:31
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Contributors
Author:
A.R. Gates
Author:
D.O.B. Jones
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