Seismic evidence of gas hydrate and seafloor fluid escape on the upper Amazon deep-sea fan, Brazilian equatorial margin
Abstract
The Amazon fan contains a gas hydrate province known from a bottom-simulating reflection (BSR) that lies within an upper slope compressional belt. In this study, the extent and character of the BSR and its relation to thrust-fold structures is examined using a grid of 2D and 3D seismic data. We show the BSR to comprise a series of elongate patches up to 16 km wide that are present along 300 km of the slope in water depths of 750-2250 m and extend over a total area of 6800 km2. The elongate BSR patches show a strong spatial correspondence with the arcuate crests of thrust-fold anticlines. In profile, the BSR patches exhibit convex forms and/or locally irregular relief that rises toward the seafloor. In plan, 3D seismic horizon maps reveal columnar BSR elevations up to 1 km wide, which rise beneath seafloor mounds and depressions, up to 0.5 km wide and 30 m in relief, interpreted as small mud volcanoes and possible pockmarks. The elongate BSR patches are interpreted to record the structurally-controlled rise of warm, gas-rich fluids into the crests of thrust-folds and their leakage into the gas hydrate stability zone, and in places to seafloor, through a near-surface system of faults, hydrofractures and vents.
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Aguiar L.F., A.F.M. Freire, L.A. Santos, A.C.F. Dominguez, E.H.P. Neves, C.G. Silva, and M.A.C. Santos, 2019, Analysis of seismic attributes to recognize bottom simulating reflectors in the Foz do Amazonas Basin, northern Brazil: Brazilian Journal of Geophysics, 37, 1, 43–53, doi: 10.22564/rbgf.v37i1.1988.
Archer D., B. Buffett, and V. Brovkin, 2009, Ocean methane hydrates as a slow tipping point in the global carbon cycle: Proceedings of the National Academy of Sciences U.S.A., 106, 49, 20,596–20,601, doi: 10.1073/pnas.0800885105.
Benjamin U.K., and M. Huuse, 2017, Seafloor and buried mounds on the western slope of the Niger Delta: Marine and Petroleum Geology, 83, 158–173, doi: 10.1016/j.marpetgeo.2017.02.023.
Berryman, J., H. Kearns, and K. Rodriguez, 2015, Foz do Amazonas Basin - A case for oil generation from geothermal gradient modelling: First Break, 33, 91–95, doi: 10.3997/1365-2397.33.11.83490.
Boswell, R., and T.S. Collett, 2011, Current perspectives on gas hydrate resources: Energy & Environmental Science, 4, 4, 1206–1215, doi: 10.1039/C0EE00203H.
Cobbold, P.R., R. Mourgues, and K. Boyd, 2004, Mechanism of thin-skinned detachment in the Amazon Fan: assessing the importance of fluid overpressure and hydrocarbon generation: Marine and Petroleum Geology, 21, 1013–1025, doi: 10.1016/j.marpetgeo.2004.05.003.
Cruz, A.M., A.T. Reis, J. Suc, C.G. Silva, D. Praeg, D. Granjeon, M. Rabineau, S. Popescu, and C. Gorini, 2019, Neogene evolution and demise of the Amapá carbonate platform, Amazon Continental Margin, Brazil: Marine and Petroleum Geology, 105, 185–203, doi:10.1016/j.marpetgeo.2019.04.009.
Cunningham, R., and R.M. Lindholm, 2000, Seismic evidence for widespread gas hydrate formation, offshore west Africa, in Mello, M.R., and B.J. Katz, eds., Petroleum Systems of South Atlantic Margins: American Association of Petroleum Geologists Memoir, 73, 93–105, doi: 10.1306/M73705C8.
Damuth, J.E., and N. Kumar, 1975, Amazon Cone: morphology, sediments, age, and growth pattern: Geological Society of America Bulletin, GSA Bulletin, 86, 863–878, doi: 10.1130/0016-7606(1975)86%3C863:ACMSAA%3E2.0.CO;2.
Deville, E., S.-H. Guerlais, S. Lallemant, and F. Schneider, 2010, Fluid dynamics and subsurface sediment mobilization processes: an overview from Southeast Caribbean: Basin Research, 22, 361–379, doi: 10.1111/j.1365-2117.2010.00474.x.
Dimitrov, L.I., 2002, Mud volcanoes – the most important pathway for degassing deeply buried sediments: Earth-Science Reviews, 59, 49–76, doi: 10.1016/S0012-8252(02)00069-7.
Dimitrov, L., and J. Woodside, 2003, Deep sea pockmark environments in the eastern Mediterranean: Marine Geology, 195, 263–276, doi: 10.1016/S0025-3227(02)00692-8.
Figueiredo J., C. Hoorn, P. van der Ven, and E. Soares, 2009, Late Miocene onset of the Amazon River and the Amazon deep-sea fan: evidence from the Foz do Amazonas Basin: Geology, 37, 619–622, doi: 10.1130/G25567A.1.
Flood, R.D., D.J.W. Piper, A. Klaus, et al., 1995, Proceedings of the Ocean Drilling Program, Initial Reports: Volume 155, Amazon Fan. College Station, Texas, USA (Ocean Drilling Program), 1233 pp., doi: 10.2973/odp.proc.ir.155.1995.
Flood, R.D., D.J.W. Piper, A. Klaus, and L.C. Peterson, 1997, Proceedings of the Ocean Drilling Program, Volume 155, Scientific Results, Amazon Fan. College Station, Texas, USA (Ocean Drilling Program), 695 pp, doi: 10.2973/odp.proc.sr.155.1997.
Fontana, R.L., and A. Mussumeci, 1994, Hydrates offshore Brazil: Annals of the New York Academy of Sciences, 715, 1, 106–113, doi: 10.1111/j.1749-6632.1994.tb38827.x.
GEBCO, 2008, General Bathymetric Chart of the Oceans, GEBCO_08 30 Arc-Second Grid, version 20091120, available on: http://www.gebco.net.
Gonçalves Souza, J.M., N. Cubas, C. Rabe, J. Letouzey, R. Divies, D. Praeg, D. Granjeon, A.M. Cruz, C.G. Silva, A.T. dos Reis, and C. Gorini, 2020, Controls on overpressure evolution during the gravitational collapse of the Amazon deep-sea fan: Marine and Petroleum Geology, 121, 104576, doi: 10.1016/j.marpetgeo.2020.104576.
Haacke, R.R., G.K. Westbrook, and R.D. Hyndman, 2007, Gas hydrate, fluid flow and free-gas: Formation of the bottom-simulating reflector: Earth and Planetary Science Letters, 261, 407–420, doi: 10.1016/j.epsl.2007.07.008.
Henry, P., X. Le Pichon, S. Lallemant, S. Lance, J.B. Martin, J.-P. Foucher, A. Fiala-Médioni, F. Rostek, N. Guilhaumou, V. Pranal, and M. Castrec, 1996, Fluid flow in and around a mud volcano field seaward of the Barbados accretionary wedge: results from Manon cruise: Journal of Geophysical Research, 101, B9, 20,297–20,323, doi: 10.1029/96JB00953.
Hillman, J.I.T., A.E. Cook, D.E. Sawyer, H.M. Ku?c?u?k, and D.S. Goldberg, 2017, The character and amplitude of ‘discontinuous’ bottom-simulating reflections in marine seismic data: Earth and Planetary Science Letters, 459, 157–169, doi: 10.1016/j.epsl.2016.10.058.
Holbrook, W.S., H. Hoskins, W.T. Wood, R.A. Stephen, and D. Lizarralde, 1996, Methane hydrate and free gas on the Blake Ridge from vertical seismic profiling: Science, 273, 1840–1843, doi: 10.1126/science.273.5283.1840.
Hoorn, C., J. Guerrero, G.A. Sarmiento, and M.A. Lorente, 1995, Andean tectonics as a cause for changing drainage patterns in Miocene northern South America: Geology, 23, 237–240, doi: 10.1130/0091-7613(1995)023b0237:ATAACFN2.3.CO;2.
Hoorn, C., F.P. Wesselingh, H. ter Steege, M.A. Bermúdez, A. Mora, J. Sevink, I. Sanmartín, A. Sanchez-Meseguer, C.L. Anderson, J.P. Figueiredo, C. Jaramillo, D. Riff, F.R. Negri, H. Hooghiemstra, J. Lundberg, T. Stadler, T. Särkinen, and A. Antonelli, 2010, Amazonia through time: Andean uplift, climate change, landscape evolution and biodiversity: Science, 330, 927–931, doi: 10.1126/science.1194585.
Hoorn, C., G.R. Bogotá-A, M. Romero-Baez, E.I. Lammertsma, S.G.A. Flantua, E.L. Dantas, R. Dino, D.A. do Carmo, and F. Chemale, 2017, The Amazon at sea: onset and stages of the Amazon River from a marine record, with special reference to Neogene plant turnover in the drainage basin: Global and Planetary Change, 153, 51–65, doi: 10.1016/j.gloplacha.2017.02.005.
Hornbach, M.J., N.L. Bangs, and C. Berndt, 2012, Detecting hydrate and fluid flow from bottom simulating reflector depth anomalies: Geology, 40, 3, 227–230, doi: 10.1130/G32635.1.
Hovland, M., J.W. Gallagher, M.B. Clennell, and K. Lekvam, 1997, Gas hydrate and free gas volumes in marine sediments: Example from the Niger Delta front: Marine and Petroleum Geology, 14, 3, 245–255, doi: 10.1016/S0264-8172(97)00012-3.
Ketzer, J.M., A. Augustin, L.F. Rodrigues, R. Oliveira, D. Praeg, M. Pivel, T. Reis, C. Silva, and B. Leonel, 2018, Gas seeps and gas hydrates in the Amazon deep-sea fan: Geo-Marine Letters, 38, 5, 429-438, doi: 10.1007/s00367-018-0546-6.
Ketzer, J.M., D. Praeg, M.A.G. Pivel, A.H. Augustin, L.F. Rodrigues, A.R. Viana, and J.A. Cupertino, 2019, Gas seeps at the edge of the gas hydrate stability zone on Brazil’s continental margin: Geosciences, 9, 193, doi: 10.3390/geosciences9050193.
Kopf, A.J., 2002, Significance of mud volcanism: Reviews of Geophysics, 40, 2, 2-1–2-52, 10.1029/2000RG000093.
Laird, A.P., and C.K. Morley, 2011, Development of gas hydrates in a deep-water anticline based on attribute analysis from three-dimensional seismic data: Geosphere, 7, 1, 240–259; doi: 10.1130/GES00598.1.
Majumdar, U., A.E. Cook, W. Shedd, and M. Frye, 2016, The connection between natural gas hydrate and bottom-simulating reflectors: Geophysical Research Letters, 43, 7044–7051, doi: 10.1002/2016GL069443.
Manley, P.L., and R.D. Flood, 1988, Cyclic sediment deposition within Amazon deep-sea fan: American Association of Petroleum Geologists Bulletin, 72, 912–925, doi: 10.1306/703C910E-1707-11D7-8645000102C1865D.
Maslin, M., N. Mikkelsen, C. Vilela, and B. Haq, 1998, Sea-level – and gas-hydrate – controlled catastrophic sediment failures of the Amazon Fan: Geology, 26, 12, 1107–1110, doi: 10.1130/0091-7613(1998)026%3C1107:SLAGHC%3E2.3.CO;2.
Maslin, M., M. Owen, R. Betts, S. Day, T. Dunkley Jones, and A. Ridgwell, 2010, Gas hydrates: Past and future geohazard?: Philosophical Transactions of the Royal Society A, Mathematical, Physical and Engineering Sciences, 368, 1919, 2369–2393, doi: 10.1098/rsta.2010.0065.
Matos, R.M.D., 2000, Tectonic evolution of the equatorial South Atlantic, in Mohriak, W., and M. Talwani, eds., Atlantic Rifts and Continental Margins: AGU Geophysical Monograph Series, 115, 331–354, doi: 10.1029/GM115p0331.
McGiveron, S., and J. Jong, 2018, Complex geothermal gradients and their implications, deepwater Sabah, Malaysia: Bulletin of the Geological Society of Malaysia, 66, 15–23, doi: 10.7186/bgsm66201803.
Melo, F.F., C.G. Silva, and A.T. dos Reis, 2008, Hidratos de ga?s no leque submarino do Amazonas: ocorrência e formac?a?o: III Simpo?sio Brasileiro de Geofi?sica, SBGf, Bele?m, PA, Brazil; 5 pp, doi: 10.22564/3simbgf2008.022.
Melo, F.F., C.G. Silva, A.T. dos Reis, and J.E.F. Araújo, 2009, Transporte de massa e hidratos de ga?s no leque submarino do Amazonas: 11th International Congress of the Brazilian Geophysical Society, Salvador, BA, Brazil, Proceedings, 5 pp., doi: 10.1190/sbgf2009-401.
Morley, C.K., J. Warren, M. Tingay, P. Boonyasaknanon, and A. Julapour, 2014, Comparison of modern fluid distribution, pressure and flow in sediments associated with anticlines growing in deepwater (Brunei) and continental environments (Iran): Marine and Petroleum Geology, 51, 210–229, doi: 10.1016/j.marpetgeo.2013.11.011.
Perovano R., A.T. dos Reis, C.G. Silva, B.C. Vendeville, C. Gorini, V. Oliveira, and E.F.S. Araújo, 2009, O processo de colapso gravitacional da seção marinha da Bacia da Foz do Amazonas – margem equatorial brasileira: Revista Brasileira de Geofísica, 27, 3, 459–484, doi: 10.1590/S0102-261X2009000300012.
Planke S., H. Svensen, M. Hovland, D.A. Banks, and B. Jamtveit, 2003, Mud and fluid migration in active mud volcanoes in Azerbaijan: Geo-Marine Letters, 23, 258–268, doi: https://doi.org/10.1007/s00367-003-0152-z.
Reis A.T., R. Perovano, C.G. Silva, B.C. Vendeville, E. Arau?jo, C. Gorini, and V. Oliveira, 2010, Two-scale gravitational collapse in the Amazon Fan: a coupled system of gravity tectonics and mass-transport processes: Journal of the Geological Society, London, 167, 593–604, doi:10.1144/0016- 76492009-035.
Reis, A.T., E. Arau?jo, Silva C.G., A.M. Cruz, C. Gorini, L. Droz, S. Migeon, R. Perovano, I. King, and F. Bache, 2016, Effects of a regional de?collement level for gravity tectonics on late Neogene to recent large-scale slope instabilities in the Foz do Amazonas Basin, Brazil: Marine and Petroleum Geology, 75, 29–52, doi: 10.1016/j.marpetgeo.2016.04.011.
Richey, J.E., J.T. Brook, R.J. Naiman, R.C. Wissmar, and R.F. Stallard, 1980, Organic carbon: oxidation and transport in the Amazon River: Science, 207, 1348–1351, doi: 10.1126/science.207.4437.1348.
Riedel, M., A.M. Tre?hu, and G.D. Spence, 2010, Characterizing the thermal regime of cold vents at the northern Cascadia margin from bottom-simulating reflector distributions, heat-probe measurements and borehole temperature data: Marine Geophysical Research, 31, 1–16, 10.1007/s11001-010-9080-2.
Sad, A.R.E., D.P. Silveira, S.R.P. Silva, R.R. Maciel, and M.A.P. Machado, 1998, Marine gas hydrates along the Brazilian margin: AAPG International Conference, Extended Abstracts, Rio de Janeiro, Brazil, 146–147.
Serié, C., M. Huuse, N.H. Schødt, J.M. Brooks, and A. Williams, 2017, Subsurface fluid flow in the deep-water Kwanza Basin, offshore Angola: Basin Research, 29, 149–179, doi: 10.1111/bre.12169.
Shedd, W., R. Boswell, M. Frye, P. Godfriaux, and K. Kramer, 2012, Occurrence and nature of “bottom simulating reflectors” in the northern Gulf of Mexico: Marine and Petroleum Geology, 34, 31–40, doi: 10.1016/j.marpetgeo.2011.08.005.
Shipley, T.H., M.H. Houston, R.T. Buffler, F.J. Shaub, K.J. McMillen, J.W. Ladd, J.L. Worzel, 1979, Seismic evidence for widespread possible gas hydrate horizons on continental slopes and rises: American Association of Petroleum Geologists Bulletin, 63, 2204–2213, doi: 10.1306/2F91890A-16CE-11D7-8645000102C1865D.
Silva, S.R.P., R.R. Maciel, and M.C.G. Severino, 1999, Cenozoic tectonics of Amazon Mouth Basin: Geo-Marine Letters, 18, 256–262, doi: 10.1007/s003670050077.
Sloan, E.D., 2003, Fundamental principles and applications of natural gas hydrates: Nature, 426, 353–359, doi: 10.1038/nature02135.
Somoza, L., T. Medialdea, R. León, G. Ercilla, J.T. Vázquez, M.-L. Farran, J. Hernández-Molina, J. González, M. Juan, and M.C. Fernández-Puga, 2012, Structure of mud volcano systems and pockmarks in the region of the Ceuta Contourite Depositional System (Western Alborán Sea): Marine Geology, 332–334, 4–26, doi: 10.1016/j.margeo.2012.06.002.
Sultan, N., V. Riboulot, S. Ker, B. Marsset, L. Geli, J.B. Tary, F. Klingelhoefer, M. Voisset, V. Lanfumey, J.L. Colliat, J. Adamy, and S. Grimaud, 2011, Dynamics of fault-fluid-hydrate systems around a shale-cored anticline in deepwater Nigeria: Journal of Geophysical Research, 116, B12110, doi: 10.1029/2011JB008218.
Tanaka, M.D., C.G. Silva, and M.B. Clennell, 2003, Gas hydrates on the Amazon Submarine Fan, Foz do Amazonas Basin, Brazil: AAPG Annual Meeting, 2003, Salt Lake City, Utah, USA; AAPG Search and Discovery Article #90013, available on: http://www.searchanddiscovery.com/pdfz/abstracts/pdf/2003/annual/extend/ndx_78250.PDF.html.
DOI: http://dx.doi.org/10.22564/brjg.v40i3.2175
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