1887
Volume 66, Issue 7
  • E-ISSN: 1365-2478

Abstract

ABSTRACT

Improved estimates of the amount of subsurface gas hydrates are needed for natural resource, geohazard, and climate impact assessments. To evaluate gas hydrate saturation from seismic methods, the properties of pure gas hydrates need to be known. Whereas the properties of sediments, specifically sands, and hydrate‐bearing sediments are well studied, the properties of pure hydrates are largely unknown. Hence, we present laboratory ultrasonic P‐wave velocity and attenuation measurements on pure tetrahydrofuran hydrates as they form with reducing temperatures from 25°C to 1°C under atmospheric pressure conditions. Tetrahydrofuran hydrates, with structure II symmetry, are considered as proxies for the structure I methane hydrates because both have similar effects on elastic properties of hydrate‐bearing sediments. We find that although velocity increased, the waveform frequency content and amplitude decreased after the hydrate formation reaction was complete, indicating an increase in P‐wave attenuation after hydrate formation. When the tetrahydrofuran hydrate was cooled below the freezing point of water, velocity and quality factor increased. Nuclear Magnetic Resonance results indicate the presence of water in the “pure hydrate” samples above the water freezing point, but none below. The presence of liquid water between hydrate grains most likely causes heightened attenuation in tetrahydrofuran hydrates above the freezing point of water. In naturally occurring hydrates, a similarly high attenuation might relate to the presence of water.

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2018-06-21
2024-04-26
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References

  1. BestA.I., PriestJ.A., Clayton, C.R.I. and ReesE.V.L.2013. The effect of methane hydrate morphology and water saturation on seismic wave attenuation in sand under shallow sub‐seafloor conditions. Earth and Planetary Science Letters368, 78–87.
    [Google Scholar]
  2. DvorkinJ. and UdenR.2004. Seismic wave attenuation in a methane hydrate reservoir. Interpreter's Corner: The Leading Edge23, 730–734.
    [Google Scholar]
  3. GuerinG. and GoldbergD.2002. Sonic waveform attenuation in gas hydrate–bearing sediments from the Mallik 2L‐38 research well, MacKenzie Delta, Canada. Journal of Geophysical Research107, 2088.
    [Google Scholar]
  4. GuerinG. and GoldbergD.2005. Modeling of acoustic wave dissipation in gas‐hydrate bearing sediments. Geochemistry, Geophysics, Geosystems6, Q07010.
    [Google Scholar]
  5. HelgerudM.B, WaiteW.F., KirbyS.H. and NurA.2009. Elastic wave speeds and moduli in polycrystalline ice Ih, sI methane hydrate, and sII methane–ethane hydrate. Journal of Geophysical Research114, p. B02212.
    [Google Scholar]
  6. JohnstonD.H., ToksözM.N. and TimurA.1979. Attenuation of seismic waves in dry and saturated rocks: II. Mechanisms. Geophysics44(4), 691–711.
    [Google Scholar]
  7. JonesC.Y., ZhangJ.S. and LeeJ.W.2010. Isotope effect on eutectic and hydrate melting temperatures in the water–THF system. Journal of Thermodynamics2010, article ID 583041.
    [Google Scholar]
  8. KleinbergR.L.1996. Utility of NMR T 2 distributions, connection with capillary pressure, clay effect, and determination of the surface relaxivity parameter (RHO) 2: 3rd Louvain Catholic University et al., Recent advances in MR application to porous media international meeting. Proceedings: Magnetic Resonance Imaging14(7–8), 761–767.
    [Google Scholar]
  9. HamiltonE.L.1972. Compressional‐wave attenuation in marine sediments. Geophysics37, 620–646.
    [Google Scholar]
  10. HuY., WenliangM. and ZhaobaW.2015. A study of ultrasonic guided wave NDT Technique based on PEEK rod. International Journal of Hybrid Information Technology8(8), 215–224.
    [Google Scholar]
  11. KlimentosT. and McCannC.1990. Relationships between compressional wave attenuation, porosity, clay content, and permeability of sandstone. Geophysics55, 998–1014.
    [Google Scholar]
  12. KoesoemadinataA.P. and McMechanG.A.2001. Empirical estimation of viscoelastic seismic parameters from petrophysical properties of sandstone. Geophysics66, 1340–1649.
    [Google Scholar]
  13. LeeM.W. and CollettT.S.2001. Elastic properties of gas hydrate‐bearing sediments. Geophysics66(3), 763–771.
    [Google Scholar]
  14. LiuZ., RectorJ.W., NiheiK.T., TomutsaL., MyerL.R. and NakagawaS.2001. Extensional wave attenuation and velocity in partially‐saturated sand in the sonic frequency range. In SEG Technical Program Expanded Abstracts 2001 pp. 1808–1811. Society of Exploration Geophysicists.
  15. MakinoT., SugaharaT. and OhgakiK.2005. Stability boundaries of tetrahydrofuran plus water system. Journal of Chemical and Engineering Data50(6), 2058–2060.
    [Google Scholar]
  16. MolotovaL.V. and Vassil'evY.I.1960. Velocities ratio of longitudinal and transverse waves in rocks, II: USSR Academy of Sciences Bulletin. Geophysics Series, 731–743.
    [Google Scholar]
  17. PrasadM. and MeissnerR.1992. Attenuation mechanisms in sands: Laboratory versus theoretical bio data. Geophysics57, 710–719.
    [Google Scholar]
  18. PrasadM. and DvorkinJ.2004. Velocity and attenuation of compressional waves in brines. SEG Expanded Abstracts, Vol. 23, 1666.
  19. PrattR., BauerK. and WeberM.2003. Crosshole waveform tomography velocity and attenuation images of arctic gas hydrates. Paper presented at 73rd annual meeting, Society of Exploration Geophysicists, Dallas, Texas.
  20. PriestJ.A., BestA.I. and ClaytonC.R.2006. Attenuation of seismic waves in methane gas hydrate‐bearing sand. Geophysical Journal International164(1), 149–159.
    [Google Scholar]
  21. SaidianM. and PrasadM.2015. Effect of mineralogy on nuclear magnetic resonance surface relaxivity: a case study of Middle Bakken and Three Forks Formations. Fuel161, 197–206.
    [Google Scholar]
  22. SloanE.D. and KohC.A.2008, Clathrate Hydrates of Natural Gases. 3rd ed. Boca Raton, FL: CRC Press, Taylor & Francis Group.
    [Google Scholar]
  23. SuzukiH. and MatsuhimaJ.2013. Quantifying uncertainties in attenuation estimation at methane‐hydrate‐bearing zones using sonic waveform logs. Geophysics78(5), D339–D353.
    [Google Scholar]
  24. ToksözM.N., JohnstonD.H. and TimurA.1978. Attenuation of seismic waves in dry and saturated rocks: 1. Laboratory measurement. Geophysics44, 681–690.
    [Google Scholar]
  25. TittmannB.R., HousleyR.M., AlersG.A. and CirlinE.H.1974. Internal friction in rocks and its relationship to volatiles on the moon. In Lunar and Planetary Science Conference Proceedings Vol. 5, pp. 2913–2918.
  26. WaiteW.F., HelgerudM.B., NurA., PinkstonJ.C., SternL.A., KirbyS.H. and DurhamW.B.2000. Laboratory measurements of compressional and shear wave speeds through methane hydrate, Annals of the New York Academy of Sciences912, 1003–1010.
    [Google Scholar]
  27. WangY.‐H. and SantamarinaJ.C.2007. Attenuation in sand: an exploratory study on the small‐strain behavior and the influence of moisture condensation. Granular Matter9(6), 365–376.
    [Google Scholar]
  28. WoodW.T., HolbrookW.S. and HoskinsH.2000. In situ measurements of P‐wave attenuation in methane hydrate and gas bearing sediments on the Blake Ridge. Proc. ODP. Results, Vol. 164 (eds. C.Paull , R.Matsumoto , P.Wallace and others) pp. 265–272. College Station, Texas: Ocean Drilling Program.
    [Google Scholar]
  29. YunT.S., FranciscaF.M., SantamarinaJ.C. and RuppelC.2005. Compressional and shear wave velocities in uncemented sediment containing gas hydrate. Geophysical Research Letters32, L10609.
    [Google Scholar]
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  • Article Type: Research Article
Keyword(s): Attenuation; Gas hydrate; NMR; Tetrahydrofuran; Ultrasonic velocity

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