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Application of AVO analysis to gas hydrates identification in the northern slope of the South China Sea

Autorzy
Identyfikatory
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Amplitude versus offset (AVO) analysis is a conventional seismic exploration technique in geophysical and lithological interpretation and has been widely used in onshore and offshore exploration. Its use in marine gas hydrate research, however, is still in initial stages. In this study, AVO analysis is applied to seismic profiles at drilling sites where hydrate samples have been recovered. The AVO responses of free gas, bottom simulating reflector (BSRs), and gas hydrates are discussed, and the AVO attributes in relation to gas hydrates are summarized. The results show that changes in intercept, gradient, fluid factor and Poisson’s ratio clearly reflect: (i) location of free gas and the BSR, and (ii) spatial relations between blank zone, BSR, gas hydrate, and free gas.
Czasopismo
Rocznik
Strony
802--817
Opis fizyczny
Bibliogr. 32 poz.
Twórcy
autor
  • Key Laboratory of Marginal Sea Geology of Chinese Academy of Sciences, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China, yangrui@ms.giec.ac.cn
autor
  • 1Key Laboratory of Marginal Sea Geology of Chinese Academy of Sciences, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China
autor
  • Guangzhou Center for Gas Hydrate Research, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, China;, yangrui@ms.giec.ac.cn
autor
  • Guangzhou Marine Geological Survey, Guangzhou, China
autor
  • Guangzhou Marine Geological Survey, Guangzhou, China
Bibliografia
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  • 7.Lin, C.-C., A.T.-S. Lin, C.-S. Liu, G.-Y. Chen, W.-Z. Liao, and P. Schnurle (2009), Geological controls on BSR occurrences in the incipient arc-continent collision zone off southwest Taiwan, Mar. Petrol. Geol. 26, 7, 1118-1131, DOI: 10.1016/j.marpetgeo.2008.11.002.
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  • 9.Lu, S., and G.A. McMechan (2002), Estimation of gas hydrate and free gas saturation, concentration, and distribution from seismic data, Geophysics 67, 2, 582-593, DOI: 10.1190/1.1468619.
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  • 11.Niu, B.H., P.F. Wen, N. Wen, X. Fu, C.Y. Sun, J. Li, and S. Sun (2006), Estimation of hydrate concentration based on AVO modeling of BSR, Chinese J. Geophys. 49, 1, 143-152, DOI: 0001-5733(2006)01-0143-10 (in Chinese).
  • 12.Ojha, M., and K. Sain (2008), Appraisal of gas-hydrate/free-gas from VP/VS ratio in the Makran accretionary prism, Mar. Petrol. Geol. 25, 7, 637-644, DOI:10.1016/j.marpetgeo.2007.10.007.
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  • 17.Shi, W.Z., Z.F. Song, X.L. Wang, and M. Kong (2009), Diapir structure and its origin in the Baiyun depression, Pearl River Mouth Basin, China, Earth Sci. J. China 34, 5, 778-784, DOI: 1000-2383(2009)05-0778-07 (in Chinese).
  • 18.Song, H.-B., O. Matsubayashi, S.-X. Yang, and W.-W. Jiang (2001), Geophysical Researches on Marine Gas Hydrates (II): Seismic Methods, Prog. Geophys. 16, 3, 110-118, DOI: 1004-2903(2001)03-0110-09 (in Chinese).
  • 19.Sun, C.-Y., M.-Y. Zhang, B.-H. Niu, and X.-W. Huang (2003), Study of modeling seismic bottom simulating reflector for natural gas hydrate, Geoscience 17, 3, 337-344, DOI: 1000-8527(2003)03-0337-08 (in Chinese).
  • 20.Sun, L.-T., D. Zhou, C.-M. Chen, W.-H. Zhan, and Z. Sun (2008), Fault structure and evolution of Baiyun Sag in Zhujiang River Mouth Basin, J. Trop.
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  • 22.Tinivella, U., and F. Accaino (2000), Compressional velocity structure and Poisson’s ratio in marine sediments with gas hydrate and free gas by inversion of reflected and refracted seismic data (South Shetland Islands, Antarctica),Mar. Geol. 164, 1-2, 13-27, DOI: 10.1016/S0025-3227(99)00123-1.
  • 23.Tinivella, U., F. Accaino, and B. Della Vedova (2008), Gas hydrates and active mud volcanism on the South Shetland continental margin, Antarctic Peninsula,Geo-Mar. Lett. 28, 2, 97-106, DOI: 10.1007/s00367-007-0093-z.
  • 24.Winters, W.J., W.F. Waite, D.H. Mason, L.Y. Gilbert, and I.A. Pecher (2007),Methane gas hydrate effect on sediment acoustic and strength properties,J. Petrol. Sci. Eng. 56, 1-3, 127-135, DOI: 10.1016/j.petrol.2006.02.003.
  • 25.Wood, W.T., P.E. Hart, D.R. Hutchinson, N. Dutta, F. Snyder, R.B. Coffin, and J.F. Gettrust (2008), Gas and gas hydrate distribution around seafloor seeps in Mississippi Canyon, Northern Gulf of Mexico, using multi-resolution seismic imagery, Mar. Petrol. Geol. 25, 9, 952-959, DOI: 10.1016/j.marpetgeo.2008.01.015.
  • 26.Wu, N.-Y., J.-Q. Liang, H.-B. Wang, X. Su, H.-B. Song, S.-Y. Jiang, Y.-H. Zhu, and Z.-Q. Lu (2008), Marine gas hydrate system: State of the art, Geoscience 22, 3, 356-362, DOI: 1000-8527(2008)03-0356-07 (in Chinese).
  • 27.Wu, N.-Y., S.-X. Yang, H.-B. Wang, J.-Q. Liang, Y.-H. Gong, Z.-Q. Lu, D.-D. Wu, and H.-X. Guan (2009), Gas-bearing fluid influx sub-system for gas hydrate geological system in Shenhu Area, Northern South China Sea, Chinese J. Geophys. 52, 6, 1641-1650, DOI: 10.3969/j.issn.0001-5733.2009.06.027 (in Chinese).
  • 28.Wu, S.-G., G.-X. Zhang, Y.-Y. Huang, J.-Q. Liang, and H.-K. Wong (2005), Gas hydrate occurrence on the continental slope of the northern South China Sea, Mar. Petrol. Geol. 22, 3, 403-412, DOI: 10.1016/j.marpetgeo.2004.11.006.
  • 29.Xu, N., S. Wu, B. Shi, B. Lu, L. Xue, X. Wang, and Y. Jia (2009), Gas hydrate associated with mud diapirs in southern Okinawa Trough, Mar. Petrol. Geol. 26, 8, 1413-1418, DOI: 10.1016/j.marpetgeo.2008.10.001.
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Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-6922977e-b723-4455-9631-c135bdb2dec0
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