Abstract
Gas seepage through the seafloor into the water column is inferred based on acoustic mapping, video observations and geochemical analyses at multiple locations in the Viking Graben and Utsira High areas of the central North Sea. Flares in the Viking Graben occur both inside and along the periphery of a submarine melt water channel where pockmarks (up to 500 m in diameter) and methane-derived carbonate crusts are found on the seafloor, indicating focussing of fluid flow in the vicinity of the channel. The flares can be related to gas accumulations close to the seafloor as well as in Quaternary and deeper strata, observed as high-amplitude reflections on seismic data. Many palaeo-channels, which act as accumulation zones, are observed in the subsurface of both the Viking Graben and Utsira High areas. The deeper origin of gas is partially supported by results of isotope analyses of headspace gas collected from sediment samples of the Viking Graben, which show a mixed microbial/thermogenic origin whereas isotope data on free seeping gas in the Viking Graben indicate a predominantly microbial origin. Based on these lines of evidence, a structure-controlled fluid flow model is proposed whereby hydrocarbons migrate in limited amount from deep thermogenic reservoirs along faults, and these deep fluids are strongly diluted by microbial methane. Moreover, the existence of subsurface pockmarks at several stratigraphic levels indicates long-term fluid flow, interpreted to be caused by gas hydrate destabilisation and stress-related high overpressures.
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Andresen KJ, Huuse M, Clausen O (2008) Morphology and distribution of Oligocene and Miocene pockmarks in the Danish North Sea—implications for bottom current activity and fluid migration. Basin Res 20:445–466
Anell I, Thybo H, Stratford W (2010) Relating Cenozoic North Sea sediments to topography in southern Norway: the interplay between tectonics and climate. Earth Planet Sci Lett 300:19–32
Anell I, Thybo H, Rasmussen E (2012) A synthesis of Cenozoic sedimentation in the North Sea. Basin Res 24:154–179
Bayon G, Henderson GM, Bohn M (2009) U–Th stratigraphy of a cold seep carbonate crust. Chem Geol 260:47–56. doi:10.1016/j.chemgeo.2008.11.020
Berndt C, Feseker T, Treude T, Krastel S, Liebetrau V, Niemann H, Bertics VJ, Dumke I, Dunnbier K, Ferre B, Graves C, Gross F, Hissmann K, Huhnerbach V, Krause S, Lieser K, Schauer J, Steinle L (2014) Temporal constraints on hydrate-controlled methane seepage off Svalbard. Science 343:284–287. doi:10.1126/science.1246298
Brekke T, Lønne Ø, Ohm SE (1997) Light hydrocarbon gases in shallow sediments in the northern North Sea. Mar Geol 137:81–108
Brothers LL, Kelley JT, Belknap DF, Barnhardt WA, Andrews BD, Maynard ML (2011) More than a century of bathymetric observations and present-day shallow sediment characterization in Belfast Bay, Maine, USA: implications for pockmark field longevity. Geo-Mar Lett 31:237–248
Cameron T, Stoker M, Long D (1987) The history of Quaternary sedimentation in the UK sector of the North Sea Basin. J Geol Soc 144:43–58
Cartwright J, Huuse M, Aplin A (2007) Seal bypass systems. AAPG Bull 91:1141–1166. doi:10.1306/04090705181
Chand S, Thorsnes T, Rise L, Brunstad H, Stoddart D, Bøe R, Lågstad P, Svolsbru T (2012) Multiple episodes of fluid flow in the SW Barents Sea (Loppa High) evidenced by gas flares, pockmarks and gas hydrate accumulation. Earth Planet Sci Lett 331:305–314
Chappell J, Shackleton NJ (1986) Oxygen isotopes and sea level. Nature 324:137–140. doi:10.1038/324137a0
Clausen OR, Nielsen OB, Huuse M, Michelsen O (2000) Geological indications for Palaeogene uplift in the eastern North Sea Basin. Glob Planet Chang 24:175–187
Clayton CJ, Hay SJ, Baylis SA, Dipper B (1997) Alteration of natural gas during leakage from a North Sea salt diapir field. Mar Geol 137:69–80. doi:10.1016/S0025-3227(96)00080-1
Crémière A, Bayon G, Ponzevera E, Pierre C (2013) Paleo-environmental controls on cold seep carbonate authigenesis in the Sea of Marmara. Earth Planet Sci Lett 376:200–211. doi:10.1016/j.epsl.2013.06.029
Crémière A, Lepland A, Chand S, Sahy D, Kirsimäe K, Bau M, Whitehouse MJ, Noble SR, Martma T, Thorsnes T, Brunstad H (2016) Fluid source and methane-related diagenetic processes recorded in cold seep carbonates from the Alvheim channel, central North Sea. Chem Geol 432:16–33. doi:10.1016/j.chemgeo.2016.03.019
D’Hondt S, Jørgensen BB, Miller DJ, Batzke A, Blake R, Cragg BA, Cypionka H, Dickens GR, Ferdelman T, Hinrichs KU, Holm NG, Mitterer R, Spivack A, Wang G, Bekins B, Engelen B, Ford K, Gettemy G, Rutherford SD, Sass H, Skilbeck CG, Aiello IW, Guerin G, House CH, Inagaki F, Meister P, Naehr T, Niitsuma S, Parkes RJ, Schippers A, Smith DC, Teske A, Wiegel J, Padilla CN, Acosta JLS (2004) Distributions of microbial activities in deep subseafloor sediments. Science 306:2216–2221. doi:10.1126/science.1101155
Dowdeswell J, Ottesen D (2013) Buried iceberg ploughmarks in the early Quaternary sediments of the central North Sea: a two-million year record of glacial influence from 3D seismic data. Mar Geol 344:1–9
Fairbanks RG (1989) A 17,000-year glacio-eustatic sea level record: influence of glacial melting rates on the Younger Dryas event and deep-ocean circulation. Nature 342:637–642
Fichler C, Henriksen S, Rueslaatten H, Hovland M (2005) North Sea Quaternary morphology from seismic and magnetic data: indications for gas hydrates during glaciation? Petrol Geosci 11:331–337
Forsberg C, Plank S, Tjelta T, Svanø G, Strout JM, Svensen H (2007) Formation of pockmarks in the Norwegian Channel. In: Proc 6th Int Offshore Site Investigation and Geotechnics Conf, 11–13 September 2007. Society of Underwater Technology, London, pp 221–230
Gabrielsen RH, Fossen H, Faleide JI, Hurich CA (2015) Mega-scale Moho relief and the structure of the lithosphere on the eastern flank of the Viking Graben, offshore southwestern Norway. Tectonics 34:2014TC003778. doi:10.1002/2014TC003778
Gafeira J, Long D, Diaz-Doce D (2012) Semi-automated characterisation of seabed pockmarks in the central North Sea. Near Surf Geophys 10:301–312. doi:10.3997/1873-0604.2012018
Gautier DL (2005) Kimmeridgian Shales Total Petroleum System of the North Sea Graben Province. US Geological Survey, Virginia
Gold T (1992) The deep, hot biosphere. Proc Natl Acad Sci 89:6045–6049
Gregersen U, Michelsen O, Sørensen JC (1997) Stratigraphy and facies distribution of the Utsira formation and the Pliocene sequences in the northern North Sea. Mar Pet Geol 14:893–914. doi:10.1016/S0264-8172(97)00036-6
Grollimund B, Zoback MD (2000) Post glacial lithospheric flexure and induced stresses and pore pressure changes in the northern North Sea. Tectonophysics 327:61–81
Haavik KE, Landrø M (2014) Iceberg ploughmarks illuminated by shallow gas in the central North Sea. Quat Sci Rev 103:34–50. doi:10.1016/j.quascirev.2014.09.002
Haflidason H, King E, Sejrup H (1998) Late Weichselian and Holocene sediment fluxes of the northern North Sea Margin. Mar Geol 152:189–215
Hartmann D, Klein Tank A, Rusicucci M, Alexander LV, Bronnimann S, Charabi Y, Dentener FJ, Dlugokencky EJ, Easterling DR, Kaplan A, Soden BJ, Thorne PW, Wild M, Zhai PM (2013) Observations: atmosphere and surface. In: Climate Change 2013: The Physical Science Basis. Contribution of Working Group I to Fifth Assessment Report of Intergovernmental Panel on Climate Change. Cambridge University Press, Cambridge
Hovland M (2007) Discovery of prolific natural methane seeps at Gullfaks, northern North Sea. Geo-Mar Lett 27:197–201
Hovland M, Sommerville JH (1985) Characteristic of two natural gas seepages in the North Sea. Mar Pet Geol 2:319–326
Hovland M, Judd AG, King LH (1984) Characteristic features of pockmarks on the North Sea floor and Scotian Shelf. Sedimentology 31:471–480
Hovland M, Talbot MR, Qvale H, Olaussen S, Aasberg L (1987) Methane-related carbonate cements in pockmarks of the North Sea. J Sediment Res 57:881–892
Hübscher C, Borowski C (2006) Seismic evidence for fluid escape from Mesozoic cuesta type topography in the Skagerrak. Mar Pet Geol 23:17–28
Hustoft S, Bünz S, Mienert J (2009) Three-dimensional seismic analysis of the morphology and spatial distribution of chimneys beneath the Nyegga pockmark field, offshore mid-Norway: 3D seismic analysis of the morphology and spatial distribution of chimneys. Basin Res 22:465–480. doi:10.1111/j.1365-2117.2010.00486.x
Huuse M (2002) Late Cenozoic palaeogeography of the eastern North Sea Basin: climatic vs tectonic forcing of basin margin uplift and deltaic progradation. In: Bull Geological Society of Denmark. Aarhus University, Copenhagen, pp 145–170
Huuse M, Lykke-Andersen H (2000) Over deepened Quaternary valleys in the eastern Danish North Sea: morphology and origin. Quat Sci Rev 19:1233–1253
Isaksen GH (2004) Central North Sea hydrocarbon systems: generation, migration, entrapment, and thermal degradation of oil and gas. AAPG Bull 88:1545–1572
Isaksen D, Tonstad K (1989) A revised Cretaceous and Tertiary lithostratigraphic nomenclature for the Norwegian North Sea. Norwegian Petroleum Directorate, Stavanger
Jordt H, Faleide JI, Bjørlykke K, Ibrahim MT (1995) Cenozoic sequence stratigraphy of the central and northern North Sea Basin: tectonic development, sediment distribution and provenance areas. Mar Pet Geol 12:845–879
Judd A, Hovland M (2009) Seabed fluid flow: the impact on geology, biology and the marine environment. Cambridge University Press, Cambridge
Karstens J, Berndt C (2015) Seismic chimneys in the Southern Viking Graben – Implications for palaeo fluid migration and overpressure evolution. Earth Planet Sci Lett 412:88–100. doi:10.1016/j.epsl.2014.12.017
Kilhams B, McArthur A, Huuse M, Ita E, Hartley A (2011) Enigmatic large-scale furrows of Miocene to Pliocene age from the central North Sea: current-scoured pockmarks? Geo-Mar Lett 31:437–449
Landeghem KJJV, Niemann H, Steinle LI, O’Reilly SS, Huws DG, Croker PF (2015) Geological settings and seafloor morphodynamic evolution linked to methane seepage. Geo-Mar Lett 35:289–304
Landrø M, Strønen L (2003) 4D study of fluid effects on seismic data in the Gullfaks Field, North Sea. Geofluids 3:233–244
Leifer I, Judd A (2015) The UK22/4b blowout 20 years on: investigations of continuing methane emissions from sub-seabed to the atmosphere in a North Sea context. Mar Pet Geol 68:706–717. doi:10.1016/j.marpetgeo.2015.11.012
Lekens W, Haflidason H, Sejrup H, Nygard A, Richter T, Vogt P, Frederichs T (2009) Sedimentation history of the northern North Sea Margin during the last 150 ka. Quat Sci Rev 28:469–483
León R, Somoza L, Medialdea T, González FJ, Gimenez-Moreno CJ, Péréz-López R (2014) Pockmarks on either side of the Strait of Gibraltar: formation from overpressured shallow contourite gas reservoirs and internal wave action during the last glacial sea-level lowstand? Geo-Mar Lett 34:131–151
Lonergan L, Maidment SC, Collier JS (2006) Pleistocene subglacial tunnel valleys in the central North Sea basin: 3‐D morphology and evolution. J Quat Sci 21:891–903
Løseth H, Wensaas L, Arntsen B, Hovland M (2003) Gas and fluid injection triggering shallow mud mobilization in the Hordaland Group, North Sea. Geol Soc Lond Spec Publ 216:139–157. doi:10.1144/GSL.SP.2003.216.01.10
Løseth H, Gading M, Wensaas L (2009) Hydrocarbon leakage interpreted on seismic data. Mar Pet Geol 26:1304–1319. doi:10.1016/j.marpetgeo.2008.09.008
Mazzini A, Duranti D, Jonk R, Parnell J, Cronin BT, Hurst A, Quine M (2003) Palaeo-carbonate seep structures above an oil reservoir, Gryphon Field, Tertiary, North Sea. Geo-Mar Lett 23:323–339
Milkov AV, Claypool GE, Lee Y-J, Xu W, Dickens GR, Borowski WS, ODP Leg 204 Scientific Party (2003) In situ methane concentrations at Hydrate Ridge, offshore Oregon: new constraints on the global gas hydrate inventory from an active margin. Geology 31:833–836. doi:10.1130/G19689.1
Nøttvedt A, Gabrielsen R, Steel R (1995) Tectonostratigraphy and sedimentary architecture of rift basins, with reference to the northern North Sea. Mar Pet Geol 12:881–901
NPD (2016) Fact Pages, Norwegian Petroleum Directorate. http://www.npd.no/no/Tema/
Nygård A, Sejrup HP, Haflidason H, Bryn P (2005) The glacial North Sea Fan, southern Norwegian Margin: architecture and evolution from the upper continental slope to the deep-sea basin. Mar Pet Geol 22:71–84
Ottesen D, Dowdeswell JA, Bugge T (2014) Morphology, sedimentary infill and depositional environments of the Early Quaternary North Sea Basin (56°–62°N). Mar Pet Geol 56:123–146
Pau M, Hammer Ø (2013) Sediment mapping and long-term monitoring of currents and sediment fluxes in pockmarks in the Oslofjord, Norway. Mar Geol 346:262–273. doi:10.1016/j.margeo.2013.09.012
Pau M, Hammer Ø, Chand S (2014) Constraints on the dynamics of pockmarks in the SW Barents Sea: evidence from gravity coring and high-resolution, shallow seismic profiles. Mar Geol 355:330–345. doi:10.1016/j.margeo.2014.06.009
Rise L, Sættem J, Fanavoll S, Thorsnes T, Ottesen D, Bøe R (1999) Sea-bed pockmarks related to fluid migration from Mesozoic bedrock strata in the Skagerrak offshore Norway. Mar Pet Geol 16:619–631
Rise L, Bellec V, Chand S, Bøe R (2015) Pockmarks in the southwestern Barents Sea and Finnmark fjords. Nor J Geol 94:263–282
Schneider von Deimling J, Brockhoff J, Greinert J (2007) Flare imaging with multibeam systems: data processing for bubble detection at seeps. Geochem Geophys Geosyst 8:Q06004. doi:10.1029/2007GC001577
Schneider von Deimling J, Rehder G, Greinert J, McGinnis DF, Boetius A, Linke P (2011) Quantification of seep-related methane gas emissions at Tommeliten, North Sea. Cont Shelf Res 31:867–878
Schroot BM, Klaver GT, Schüttenhelm RT (2005) Surface and subsurface expressions of gas seepage to the seabed—examples from the Southern North Sea. Mar Pet Geol 22:499–515
Sejrup HP, Aarseth I, Haflidason H (1991) The Quaternary succession in the northern North Sea. Mar Geol 101:103–111
Sigmond EMO (1992) Bedrock map of Norway and adjacent ocean areas, scale 1:3,000,000. Geological Survey of Norway, Trondheim
Stoker MS, Long D, Fyfe JA (1985) The Quaternary succession in the central North Sea. Newsl Stratigr 14:119–128
Vielstädte L, Karstens J, Haeckel M, Schmidt M, Linke P, Reimann S, Liebetrau V, McGinnis DF, Wallmann K (2015) Quantification of methane emissions at abandoned gas wells in the Central North Sea. Mar Pet Geol 68:848–860
Vogt P, Gardner J, Crane K (1999) The Norwegian–Barents–Svalbard (NBS) continental margin: introducing a natural laboratory of mass wasting, hydrates, and ascent of sediment, pore water, and methane. Geo-Mar Lett 19:2–21
Wingfield R (1989) Glacial incisions indicating Middle and Upper Pleistocene ice limits off Britain. Terra Nov. 1:538–548
Acknowledgments
We thank Lundin Petroleum Norge AS for providing all support through the project, and the Norwegian Defence Research Establishment (FFI) in acquiring the data and samples used in the study. Also acknowledged are constructive assessments by M. Huuse and an anonymous reviewer on an earlier version of the article.
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Chand, S., Crémière, A., Lepland, A. et al. Long-term fluid expulsion revealed by carbonate crusts and pockmarks connected to subsurface gas anomalies and palaeo-channels in the central North Sea. Geo-Mar Lett 37, 215–227 (2017). https://doi.org/10.1007/s00367-016-0487-x
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DOI: https://doi.org/10.1007/s00367-016-0487-x