Journal of the Geological Society of Korea (지질학회지)

The Geological Society of Korea (대한지질학회)
권호 표지

The occurrence patterns of gas hydrate in the Ulleung Basin, East Sea

동해 울릉분지의 가스하이드레이트 부존 형태

Kang, Dong-Hyo;Yoo, Dong-Geun;Bahk, Jang-Jun;Ryu, Byong-Jae;Koo, Nam-Hyung;Kim, Won-Sik;Park, Kwan-Soon;Park, Keun-Pil;Kim, Ji-Soo
강동효;유동근;박장준;류병재;구남형;김원식;박관순;박근필;김지수

  • Published : 20090400

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Abstract

A total of 6,690 L-kms of two-dimensional and 400 $km^{2}$ of three-dimensional multi-channel seismic reflection data were collected in the Ulleung Basin, East Sea in 2005 and 2006. On the basis of the echo-sounding images of precision deepsea recorder and the multi-channel seismic interpretation, seismic indicators of gas hydrate and associated gas such as bottom simulating reflector (BSR), acoustic blanking, column structure, gas seepage, enhanced reflection were identified. Gas hydrate was detected in localized column structure and sandy layer as nodules, veins, layers, and as disseminated forms from the previous expedition in 2007. Fractures, faults, sandy layer could be the migration pathways transporting fluid and gas to stability zone. Upward diffuse fluid flow could also transport fluid and gas to stability zone. The occurrence types of gas hydrate based on the patterns of gas and fluid migration and the gas hydrate accumulation in the Ulleung Basin include: (1) nodules, veins, layers in muddy sediments and disseminated forms in sandy layer within localized column structure, (2) disseminated forms in sandy layer due to fluid and gas transport through faults, and (3) disseminated forms in sandy layer just above BSR due to fluid and gas transport by upward diffuse fluid flow and through sandy layer.

동해 울릉분지에서 가스하이드레이트 부존을 확인하기 위하여, 2005년 6,690 L-km의 2차원 다채널 탄성파 탐사자료와 2006년 400 $km^{2}$의 3차원 다채널 탄성파 탐사자료를 취득하였다. 탄성파 탐사자료 및 단일빔 정밀음향측심자료 해석에 의해 가스 또는 가스하이드레이트 부존을 나타내는 지구물리학적 지시자인 해저모방반사면, 칼럼구조, 가스분출, 음향공백대, 증폭반사면을 확인하였다. 2007년 심부시추로 칼럼구조와 사질층에서 단괴, 맥, 층 및 공극을 채우는 형태의 가스하이드레이트 부존을 확인하였다. 가스하이드레이트 형성에 중요한 역할을 하는 가스 및 유체는 울릉분지 남부 및 북동부 대륙사면과 북부 분지평원에 잘 발달된 단층을 따라, 서부 대륙사면 저부지역에서 보이는 사질층을 따라, 그리고 오랜 시간동안 위쪽으로 니질층등 퇴적물의 공극을 통해 안정영역으로 이동하는 것으로 해석된다. 가스 및 유체의 이동 형태, 가스하이드레이트 부존 지역, 퇴적물내에서의 산출 형태에 기초하여 가스하이드레이트는 (1) 칼럼구조 내부 니질층에서 단괴, 맥, 층의 형태 그리고 사질층에서 공극을 채우는 형태, (2) 단층을 따라 이동한 가스 및 유체에 의해 안정영역 내에 존재하는 사질층에 공극을 채우는 형태, (3) 사질층을 따라 이동하거나 오랜 시간동안 퇴적물의 공극을 따라 위쪽으로 이동한 가스 및 유체에 의해 해저모방반사면 직상부 사질층에 공극을 채우는 형태로 부존한다.

Keywords

References

  1. 유동근, 강동효, 구남형, 김원식, 김길영, 김병엽, 정순홍, 김영준, 이호영, 박근필, 이광훈, 박수철, 2008, 동해 울릉분지 가스하이드레이트 부존 지구물리증거. 지질학회지, 44, 645-655
  2. 최동림, 홍종국, 유해수, 주형태, 한상준, 2001, 동해 울릉분지 남서 사면지역에서 탄성파 특징으로부터 유추한 가스수화물의 존재 가능성. 한국해양학회지, 6, 242-248
  3. 한국지질자원연구원, 2007a, 가스하이드레이트 지구물리탐사연구. 한국지질자원연구원 연구 보고서 NP2007-020-2007(1), 649 p
  4. 한국지질자원연구원, 2007b, 가스하이드레이트 심부시추시료 분석 및 안정성·지질재해 연구 한국지질자원연구원 연구보고서 NP2007-021-2007(1), 429 p
  5. 한국지질자원연구원, 2008, 가스하이드레이트 심부시추시료 분석 및 안정성·지질재해 연구 한국지질자원연구원 연구보고서 NP2008-003-2008(1), 240 p
  6. Baba, K. and Yamada, Y., 2004, BSRs and associated reflections as an indicator of gas hydrate and free gas accumulation. Resource Geology, 54, 11-24 https://doi.org/10.1111/j.1751-3928.2004.tb00183.x
  7. Bunz, S., Mienert, J. and Berndt, C., 2003, Geological controls on the Storegga gas-hydrate system of the mid-Norwegian continental margin. Earth and Planetary Science Letters, 209, 291-307 https://doi.org/10.1016/S0012-821X(03)00097-9
  8. Chough, S.K., 1983, Marine Geology of Korean Seas. Boston: IHRD, 157 p
  9. Chough, S.K., Lee, S.H., Kim, J.W., Park, S.C., Yoo, D.G., Han, H.S., Yoon, S.H., Oh, S.B., Kim, Y.B. and Back, G.G., 1997, Chirp(2-7kHz) echo characters in the Ulleung Basin. Geoscience Journal, 1, 143-154 https://doi.org/10.1007/BF02910206
  10. Engelozos, P., 1996, Fundamentals and technological applications of gas hydrates, In proceedings of Canada-Japan Joint Science and Technology Workshop on Gas Hydrate Studies, Tsukuba, March 4-6, 55-82
  11. Haacke, R.R., Westbrook, G.K. and Riley, M.S., 2008, Controls on the formation and stability of gas hydrate-related bottom-simulating reflectors (BSRs): A case study from the west Svalbard continental slope. Journal of Geophysical Research, 113, doi: 10.1029/2007JB005200
  12. Hyndman, R.D., 2006, Marine Gas Hydrate off W.Canada and Some Comparisons with the East Sea off Korea. Thematic Session & 2nd International Symposium on Gas Hydrate Technology at the 43rd CCOP Annual Session(Abstracts), Daejeon, Korea, November 1-2
  13. Hyndman, R.D. and Davis E.E., 1992, A mechanism for the formationof methane hydrate and seafloor bottom-simulating reflectors by vertical fluid expulsion. Journal of Geophysical Research, 97, 7025-7041 https://doi.org/10.1029/91JB03061
  14. Kang, D.H., Yoo, D.G. Park, K.P., Koo, N.H., Kim, W.S., Park, K.S. and Lee, H.Y., 2008, The seismic indicators of gas hydrate in the Ulleung Basin, East Sea off KOREA. Proceedings of the 6th International Conference on Gas Hydrates, Vancouver, British Columbia, CANADA, July 6-10, 62 p
  15. Kennett, J.P., Cannariato, K.G., Hendy, I.L. and Behl, R.J., 2003, Methane hydrates in Quaternary climate change: The clathrate gun hypothesis. American Geophsical Union, Washington, DC, 273-296
  16. Kvenvolden, K.A., 1993, A primer on gas hydrates. In: Howel, D.G. (Ed.), The Future of Energy Gases. USGS Professional Paper, 1570, 279-291
  17. Lee, J.H., Baek, Y.S., Ryu, B.J., Riedel, M. and Hyndman, R.D., 2005, A seismic survey to detect natural gas hydrate in the East Sea of Korea. Marine Geophysical Researches, 26, 51-59 https://doi.org/10.1007/s11001-005-6975-4
  18. Lee, K.S., Park, K.W., Yoon, O.K., 2007, Marine Geography of the East Sea. In:Ocean Atlas of KOREA. National Oceanographic Research Institute, 32-51
  19. Milkov, A.V., 2004, Global estimates of hydrate-bound gas in marine sediments: how much is really out there? Earth-Sci. Rev, 66(3-4), 183-197 https://doi.org/10.1016/j.earscirev.2003.11.002
  20. Milkov, A. V. and Sassen R., 2002, Economic geology of offshore gas hydrate accumulations and provinces. Marine and Petroleum Geology, 19, 1-11 https://doi.org/10.1016/S0264-8172(01)00047-2
  21. Park, K.P., Bahk, J.J., Kwon, Y., Kim, G.Y., Riedel, M., Holland, M., Schultheiss, P., Rose, K., UBGH-1 Scientic Party, 2008, Korea national program expedition confirms rich gas hydrate deposits in the Ulleung Basin, East Sea, U.S. Department of Energy, Office of Fossil Energy, National Energy Technology Laboratory, Spring, Methane Hydrate Newsletter, 6-9
  22. Paull, C.K., Ussler III, W. and Dillon, W.P., 1991. Is the extent of glaciation limited by marine gas-hydrates? Geophys. Res. Lett, 18, 432-434 https://doi.org/10.1029/91GL00351
  23. Paull, C.K., Buelow, W., Ussler, W. and Borowski, W.S., 1996, Increased continental-margin slumping frequency during sea-level lowstands above gas hydrate-bearing sediments. Geology, 24, 143-146 https://doi.org/10.1130/0091-7613(1996)024<0143:ICMSFD>2.3.CO;2
  24. Riedel, M., Collett, T.S., Malone, M.J. and Expedition 311 Scientists, 2006a, Proceeding of the Integrated Ocean Drilling Program: Volume 311 Expedition Reports Cascadia Margin Gas Hydrates. IODP
  25. Riedel, M., Spence, G.D., Hyndman, R.D., Chapman, R.N. Solem, R.C. and Lewis, T., 2006b, Geophysical and geochemical signatures associated with gas hydrate-related venting in the northern Cascadia margin. Geol. Soc. Am. Bull., 118, 23-38 https://doi.org/10.1130/B25720.1
  26. Ryu, B.J., Riedel, M., Kim, J.H., Hyndman, R.D., Lee, Y.J., Chung, B.H., 2009, Gas hydrates in the western deep-water Ulleung Basin, East Sea of Korea. Marine and Petroleum Geology, In Press, doi:10.1016, 1-16
  27. Saeki, T., Fujii, T., Inamori, T., Kobayashi, T., Hayashi, M., Nagakubo, S., Takano, O., 2008, Delineation of methane hydrate concentrated zone using 3D seismic data in the eastern Nankai Trough. Proceedings of the 6th International Conference on Gas Hydrates, Vancouver, British Columbia, CANADA, July 6-10, 68 p
  28. Shipley, T.H., Houston, M.H., Buffler, R.T., Shaub, F.J., McMillen, K.J., Ladd, J.W. and Worzel, J.L., 1979, Seismic reflection evidence for widespread occurrence of possible gas-hydrate horizons on continental slopes and rises. American Association Petroleum Geologists Bulletin, 63, 2204-2213
  29. Sloan, E.D. and Koh, C.A., 2008, Chathrate hydrate of natural gases(Third edition). CRC Press, New York, 721 p