Gas hydrate saturation and distribution in the Kumano Forearc Basin of the Nankai Trough
Jihui Jia 1 Takeshi Tsuji 2 4 Toshifumi Matsuoka 3
+ Author Affiliations
- Author Affiliations
1 Department of Urban Management, Kyoto University, C1-1-118 Kyotodaigaku-Katsura, Nishikyo-ku, Kyoto 615-8540, Japan.
2 International Institute for Carbon-Neutral Energy Research (I2CNER) and Faculty of Engineering, Kyushu University, 744 Motooka Nishi-ku, Fukuoka 819-0395, Japan.
3 Fukada Geological Institute, 2-13-12 Honkomagome Bunkyo-ku, Tokyo 133-0021, Japan.
4 Corresponding author. Email: tsuji@i2cner.kyushu-u.ac.jp
Exploration Geophysics 48(2) 137-150 https://doi.org/10.1071/EG15127
Submitted: 22 December 2015 Accepted: 24 December 2015 Published: 12 February 2016
Abstract
The Kumano Forearc Basin is located to the south-east of the Kii Peninsula, Japan, overlying the accretionary prism in the Nankai Trough. The presence of gas hydrate in submarine sediments of the forearc basin has resulted in the widespread occurrence of bottom simulating reflectors (BSRs) on seismic profiles, and has caused distinct anomalies in logging data in the region. We estimated the in situ gas hydrate saturation from logging data by using three methods: effective rock physics models, Archie’s equation, and empirical relationships between acoustic impedance (AI) and water-filled porosity. The results derived from rock physics models demonstrate that gas hydrates are attached to the grain surfaces of the rock matrix and are not floating in pore space. By applying the empirical relationships to the AI distribution derived from model-based AI inversion of the three-dimensional (3D) seismic data, we mapped the spatial distribution of hydrate saturation within the Kumano Basin and characterised locally concentrated gas hydrates. Based on the results, we propose two different mechanisms of free gas supply to explain the process of gas hydrate formation in the basin: (1) migration along inclined strata that dip landwards, and (2) migration through the faults or cracks generated by intensive tectonic movements of the accretionary prism. The dipping strata with relatively low AI in the forearc basin could indicate the presence of hydrate formation due to gas migration along the dipping strata. However, high hydrate concentration is observed at fault zones with high pore pressures, thus the second mechanism likely plays an important role in the genesis of gas hydrates in the Kumano Basin. Therefore, the tectonic activities in the accretionary wedge significantly influence the hydrate saturation and distribution in the Kumano Forearc Basin.
Key words: basin analysis, hydrates, inversion, rock physics, saturation, seismic reflection.
References
Archie, G. E., 1942, The electrical resistivity log as an aid in determining some reservoir characteristics: Transactions of the American Institute of Mining, Metallurgical and Petroleum Engineers, 146, 54–62Ashi, J., Tokuyama, H., and Taira, A., 2002, Distribution of methane hydrate BSRs and its implication for the prism growth in the Nankai Trough: Marine Geology, 187, 177–191
| Distribution of methane hydrate BSRs and its implication for the prism growth in the Nankai Trough:Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD38Xls1Wgsrc%3D&md5=721f7c58ffdba37b4113467f67c42a26CAS |
Baba, K., and Yamada, Y., 2004, BSRs and associated reflections as an indicator of gas hydrate and free gas accumulation: an example of accretionary prism and forearc basin system along the Nankai Trough, off central Japan: Resource Geology, 54, 11–24
| BSRs and associated reflections as an indicator of gas hydrate and free gas accumulation: an example of accretionary prism and forearc basin system along the Nankai Trough, off central Japan:Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD2cXltFWrsbk%3D&md5=8982e5384b5100c4ed7bbb5e4606e0e5CAS |
Boswell, R., 2013, Japan completes first offshore methane hydrate production test – methane successfully produced from deepwater hydrate layers: Methane Hydrate Newsletter, 13, 1–2
Collett, T. S., and Ladd, J., 2000, Detection of gas hydrate with downhole logs and assessment of gas hydrate concentrations (saturations) and gas volumes on the Blake Ridge with electrical resistivity data: Proceedings of the Ocean Drilling Program: Scientific Results, 164, 179–191.
Collett, T. S., and Lee, M. W., 2012, Well log characterization of natural gas-hydrates: Petrophysics, 53, 348–367
Doan, M.L., Conin, M., Henry, P., Wiersberg, T., Boutt, D., Buchs, D., Saffer, D., McNeill, L.C., Cukur, D., and Lin, W., 2011, Quantification of free gas in the Kumano fore-arc basin detected from borehole physical properties: IODP NanTroSEIZE drilling Site C0009: Geochemistry, Geophysics, Geosystems, 12, Q0AD06
| Quantification of free gas in the Kumano fore-arc basin detected from borehole physical properties: IODP NanTroSEIZE drilling Site C0009:Crossref | GoogleScholarGoogle Scholar |
Dvorkin, J., and Nur, A., 1996, Elasticity of high-porosity sandstones: theory for two North Sea data sets: Geophysics, 61, 1363–1370
| Elasticity of high-porosity sandstones: theory for two North Sea data sets:Crossref | GoogleScholarGoogle Scholar |
Dvorkin, J., Prasad, M., Sakai, A., and Lavoie, D., 1999, Elasticity of marine sediments: rock physics modeling: Geophysical Research Letters, 26, 1781–1784
| Elasticity of marine sediments: rock physics modeling:Crossref | GoogleScholarGoogle Scholar |
Ecker, C., Dvorkin, J., and Nur, A. M., 2000, Estimating the amount of gas hydrate and free gas from marine seismic data: Geophysics, 65, 565–573
| Estimating the amount of gas hydrate and free gas from marine seismic data:Crossref | GoogleScholarGoogle Scholar |
Expedition 314 Scientists, 2009a, Expedition 314 Site C0002, in M. Kinoshita, H. Tobin, J. Ashi, G. Kimura, S. Lallemant, E. J. Screaton, D. Curewitz, H. Masago, K. T. Moe, and the Expedition 314/315/316 Scientists, eds, Proceedings of the Integrated Ocean Drilling Program, 314/315/316: Integrated Ocean Drilling Program Management International, Inc., 1–77.
Expedition 314 Scientists, 2009b, Expedition 314 methods, in M. Kinoshita, H. Tobin, J. Ashi, G. Kimura, S. Lallemant, E. J. Screaton, D. Curewitz, H. Masago, K. T. Moe, and the Expedition 314/315/316 Scientists, eds, Proceedings of the Integrated Ocean Drilling Program, 314/315/316: Integrated Ocean Drilling Program Management International, Inc., 1–33.
Expedition 315 Scientists, 2009, Expedition 315 Site C0002, in M. Kinoshita, H. Tobin, J. Ashi, G. Kimura, S. Lallemant, E. J. Screaton, D. Curewitz, H. Masago, K. T. Moe, and the Expedition 314/315/316 Scientists, eds, Proceedings of the Integrated Ocean Drilling Program, 314/315/316: Integrated Ocean Drilling Program Management International, Inc., 1–76.
Expedition 319 Scientists, 2010, Expedition 319 summary, in D. Saffer, L. McNeill, T. Byrne, E. Araki, S. Toczko, N. Eguchi, K. Takahashi, and the Expedition 319 Scientists, eds, Proceedings of the Integrated Ocean Drilling Program 319: Integrated Ocean Drilling Program Management International, Inc., 1–46.
Foucher, J. P., Nouze, H., and Henry, P., 2002, Observation and tentative interpretation of a double BSR on the Nankai Slope: Marine Geology, 187, 161–175
| Observation and tentative interpretation of a double BSR on the Nankai Slope:Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD38Xls1WgsrY%3D&md5=d49009c47d9fa3738f33e00e62f05c70CAS |
Fujii, T., Saeki, T., Kobayashi, T., Inamori, T., Hayashi, M., Takano, O., Takayama, T., Kawasaki, T., Nagakubo, S., Nakamizu, M., and Yokoi, K., 2008, Resource assessment of methane hydrate in the eastern Nankai Trough, Japan: Offshore Technology Conference, 5–8 May, Houston, Texas, USA, 1–15.
Golmshtok, A. Y., and Soloviev, V. A., 2006, Some remarks on the thermal nature of the double BSR: Marine Geology, 229, 187–198
| Some remarks on the thermal nature of the double BSR:Crossref | GoogleScholarGoogle Scholar |
Gulick, S., Bangs, N., Moore, G., Ashi, J., Martin, K., Sawyer, D., Tobin, H., Kuramoto, S., and Taira, A., 2010, Rapid forearc basin uplift and megasplay fault development from 3D seismic images of Nankai Margin off Kii Peninsula, Japan.: Earth and Planetary Science Letters, 300, 55–62
| Rapid forearc basin uplift and megasplay fault development from 3D seismic images of Nankai Margin off Kii Peninsula, Japan.:Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3cXhsValtLnK&md5=59e979064f992eec226146ae336d8b4fCAS |
Hamamoto, H., Yamano, M., Goto, S., Kinoshita, M., Fujino, K., and Wang, K., 2011, Heat flow distribution and thermal structure of the Nankai subduction zone off the Kii Peninsula: Geochemistry, Geophysics, Geosystems, 12, Q0AD20
| Heat flow distribution and thermal structure of the Nankai subduction zone off the Kii Peninsula:Crossref | GoogleScholarGoogle Scholar |
He, L., Matsubayashi, O., and Lei, X., 2006, Methane hydrate accumulation model for the Central Nankai accretionary prism: Marine Geology, 227, 201–214
| Methane hydrate accumulation model for the Central Nankai accretionary prism:Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD28XitVGgtr8%3D&md5=46833cd56ed405a397b689378ce4f55dCAS |
Helgerud, M. B., 2001, Wave speeds in gas hydrate and sediments containing gas hydrate: a laboratory and modeling study: D.Sc. thesis, Stanford University.
Helgerud, M. B., Dvorkin, J., Nur, A., Sakai, A., and Collett, T., 1999, Elastic-wave velocity in marine sediments with gas hydrates: effective medium modelling: Geophysical Research Letters, 26, 2021–2024
| Elastic-wave velocity in marine sediments with gas hydrates: effective medium modelling:Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DyaK1MXkvV2ls7Y%3D&md5=2b78c109d505c204408726c92cfa0547CAS |
Inamori, T., and Hato, M., 2004, Detection of methane hydrate-bearing zones from seismic data: Resource Geology, 54, 99–104
| Detection of methane hydrate-bearing zones from seismic data:Crossref | GoogleScholarGoogle Scholar |
Kinoshita, M., Moore, G. F., and Kido, Y. N., 2011, Heat flow estimated from BSR and IODP borehole data: implication of recent uplift and erosion of the imbricate thrust zone in the Nankai Trough off Kumano: Geochemistry, Geophysics, Geosystems, 12, Q0AD18
| Heat flow estimated from BSR and IODP borehole data: implication of recent uplift and erosion of the imbricate thrust zone in the Nankai Trough off Kumano:Crossref | GoogleScholarGoogle Scholar |
Kvenvolden, K. A., 1993, Gas hydrates-geological perspective and global change: Reviews of Geophysics, 31, 173–187
| Gas hydrates-geological perspective and global change:Crossref | GoogleScholarGoogle Scholar |
Lee, M. W., and Collett, T. S., 2001, Elastic properties of gas hydrate-bearing sediments: Geophysics, 66, 763–771
| Elastic properties of gas hydrate-bearing sediments:Crossref | GoogleScholarGoogle Scholar |
Lu, S. M., and McMechan, G. A., 2002, Estimation of gas hydrate and free gas saturation, concentration, and distribution from seismic data: Geophysics, 67, 582–593
| Estimation of gas hydrate and free gas saturation, concentration, and distribution from seismic data:Crossref | GoogleScholarGoogle Scholar |
Malinverno, A., Kastner, M., Torres, M. E., and Wortmann, U. G., 2008, Gas hydrate occurrence from pore water chlorinity and downhole logs in a transect across the northern Cascadia margin (Integrated Ocean Drilling Program Expedition 311): Journal of Geophysical Research, 113, B08103
| Gas hydrate occurrence from pore water chlorinity and downhole logs in a transect across the northern Cascadia margin (Integrated Ocean Drilling Program Expedition 311):Crossref | GoogleScholarGoogle Scholar |
Matsumoto, R., Tomaru, H., and Lu, H. L., 2004, Detection and evaluation of gas hydrates in the eastern Nankai Trough by integrated geochemical and geophysical methods: Resource Geology, 54, 53–67
| Detection and evaluation of gas hydrates in the eastern Nankai Trough by integrated geochemical and geophysical methods:Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD2cXltFWrtr4%3D&md5=af53b7921466831bfeb929cd1db0c46cCAS |
Mavko, G., Mukerji, T., and Dvorkin, J., 2009, Rock physics handbook (2nd edition): Cambridge University Press.
Milkov, A. V., 2000, Worldwide distribution of submarine mud volcanoes and associated gas hydrates: Marine Geology, 167, 29–42
| Worldwide distribution of submarine mud volcanoes and associated gas hydrates:Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD3cXktV2ku7Y%3D&md5=bed8ccf86dc4980bf440c308227d3c5bCAS |
Miyakawa, A., Saito, S., Yamada, Y., Tomaru, H., Kinoshita, M., and Tsuji, T., 2014, Gas hydrate saturation at Site C0002, IODP Expeditions 314 and 315, in the Kumano Basin, Nankai Trough: The Island Arc, 23, 142–156
| Gas hydrate saturation at Site C0002, IODP Expeditions 314 and 315, in the Kumano Basin, Nankai Trough:Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC2cXosFahtr0%3D&md5=d1c2cc961344ef093666cf2d50b69c70CAS |
Moore, G. F., Park, J. O., Bangs, N. L., Gulick, S. P., Tobin, H. J., Nakamura, Y., Sato, S., Tsuji, T., Yoro, T., Tanaka, H., Uraki, S., Kido, Y., Sanada, Y., Kuramoto, S., and Taira, A., 2009, Structural and seismic stratigraphic framework of the NantroSEIZE Stage 1 transect, in M. Kinoshita, H. Tobin, J. Ashi, G. Kimura, S. Lallemant, E. J. Screaton, D. Curewitz, H. Masago, K. T. Moe, and the Expedition 314/315/316 Scientists, eds, Proceedings of the Integrated Ocean Drilling Program 314/315/316: Integrated Ocean Drilling Program Management International, Inc., 1–46.
Moore, G. F., Boston, B. B., Sacks, A. F., and Saffer, D. M., 2013, Analysis of normal fault populations in the Kumano Forearc Basin, Nankai Trough, Japan: 1. Multiple orientations and generations of faults from 3D coherency mapping: Geochemistry, Geophysics, Geosystems, 114, 1989–2002
| Analysis of normal fault populations in the Kumano Forearc Basin, Nankai Trough, Japan: 1. Multiple orientations and generations of faults from 3D coherency mapping:Crossref | GoogleScholarGoogle Scholar |
Nur, A., Mavko, G., Dvorkin, J., and Galmudi, D., 1998, Critical porosity: a key to relating physical properties to porosity in rocks: The Leading Edge, 17, 357–362
| Critical porosity: a key to relating physical properties to porosity in rocks:Crossref | GoogleScholarGoogle Scholar |
Pape, T., Geprags, P., Hammerschmidt, S., Wintersteller, P., Wei, J., Fleischmann, T., Bohrmann, G., and Kopf, A. J., 2014, Hydrocarbon seepage and its sources at mud volcanoes of the Kumano forearc basin, Nankai Trough subduction zone: Geochemistry, Geophysics, Geosystems, 15, 2180–2194
| Hydrocarbon seepage and its sources at mud volcanoes of the Kumano forearc basin, Nankai Trough subduction zone:Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC2cXht1ansLzM&md5=52fdd2902407557e5fdd28e13d52f42fCAS |
Park, J. O., Tsuru, T., Kodaira, S., Cummins, P. R., and Kaneda, Y., 2002, Splay fault branching along the Nankai subduction zone: Science, 297, 1157–1160
| Splay fault branching along the Nankai subduction zone:Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD38XmsVOhsrk%3D&md5=e9061c19305f48dce1becdac83e12eb4CAS | 12183623PubMed |
Pearson, C. F., Halleck, P. M., McGuire, P. L., Hermes, R., and Mathews, M., 1983, Natural gas hydrate: a review of in situ properties: Journal of Physical Chemistry, 87, 4180–4185
| Natural gas hydrate: a review of in situ properties:Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DyaL3sXlsValsro%3D&md5=fe133c089d56bd960b74def61644bd17CAS |
Saffer, D., McNeill, L., Araki, E., Byrne, T., Eguchi, N., Toczko, S., Takahashi, K., and the Expedition 319 Scientists, 2009, NanTroSEIZE Stage 2: NanTroSEIZE riser/riserless observatory: Integrated Ocean Drilling Program Expedition 319 Preliminary Report, 1–83.
Saito, S., Miyakawa, A., Yamada, Y., and Kinoshita, M., 2010, Methane hydrate occurrence estimated from downhole logging at IODP Site C0002, Kumano basin: Journal of the Japanese Association for Petroleum Technology, 75, 54–58
| Methane hydrate occurrence estimated from downhole logging at IODP Site C0002, Kumano basin:Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC3cXivFKktL8%3D&md5=2dc3832231be284dde69cfdcd1bb96adCAS |
Sloan, E.D. Jr, and Koh, C., 2007, Clathrate hydrates of natural gases (3rd edition): CRC Press.
Strasser, M., Dugan, B., Kanagawa, K., Moore, G. F., Toczko, S., Maeda, L., Kido, Y., Moe, K. T., Sanada, Y., Esteban, L., Fabbri, O., Geersen, J., Hammerschmidt, S., Hayashi, H., Heirman, K., Hupers, A., Jurado Rodriguez, M. J., Kameo, K., Kanamatsu, T., Kitajima, H., Masuda, H., Milliken, K., Mishra, R., Motoyama, I., Olcott, K., Oohashi, K., Pickering, K. T., Ramirez, S. G., Rashid, H., Sawyer, D., Schleicher, A., Shan, Y., Skarbek, R., Song, I., Takeshita, T., Toki, T., Tudge, J., Webb, S., Wilson, D. J., Wu, H.-Y., and Yamagushi, A., 2014, Site C0002, in M. Strasser, B. Dugan, K. Kanagawa, G. F. Moore, S. Toczko, L. Maeda, and the Expedition 338 Scientists, eds, Proceedings of the Integrated Ocean Drilling Program, 338: Integrated Ocean Drilling Program, 1–248.
Swisi, A. 2009, Post- and pre-stack attribute analysis and inversion of Blackfoot 3D seismic dataset: M.Sc. thesis, University of Saskatchewan.
Toki, T., Uehara, Y., Kinjo, K., Ijiri, A., Tsunogai, U., Tomaru, H., and Ashi, J., 2012, Methane production and accumulation in the Nankai accretionary prism: results from IODP Expeditions 315 and 316: Geochemical Journal, 46, 89–106
| Methane production and accumulation in the Nankai accretionary prism: results from IODP Expeditions 315 and 316:Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC38XpsVyqtLk%3D&md5=f966cb62391cfa58d631bd1c4895c9afCAS |
Tsuji, Y., Namikawa, T., Fujii, T., Hayashi, M., Kitamura, R., Nakamizu, M., Ohbi, K., Saeki, T., Yamamoto, K., Inamori, T., Oikawa, N., Shimizu, S., Kawasaki, M., Nagakubo, S., Matsushima, J., Ochiai, K., and Okui, T., 2009, Methane-hydrate occurrence and distribution in the eastern Nankai Trough, Japan: findings of the Tokai-oki to Kumano-nada methane-hydrate drilling program: AAPG Memoir, 89, 228–246
Tsuji, T., Hino, R., Sanada, Y., Yamamoto, K., Park, J.O., No, T., Araki, E., Bangs, N., Huene, R., Moore, G., and Kinoshita, M., 2011a, In situ stress state from walkaround VSP anisotropy in the Kumano Basin southeast of the Kii Peninsula, Japan: Geochemistry, Geophysics, Geosystems, 12, Q0AD19
| In situ stress state from walkaround VSP anisotropy in the Kumano Basin southeast of the Kii Peninsula, Japan:Crossref | GoogleScholarGoogle Scholar |
Tsuji, T., Dvorkin, J., Mavko, G., Nakata, N., Matsuoka, T., Nakanishi, A., Kodaira, S., and Nishizawa, O., 2011b, Vp/Vs ratio and shear-wave splitting in the Nankai Trough seismogenic zone: insights into effective stress, pore pressure and sediment consolidation: Geophysics, 76, WA71–WA82
| Vp/Vs ratio and shear-wave splitting in the Nankai Trough seismogenic zone: insights into effective stress, pore pressure and sediment consolidation:Crossref | GoogleScholarGoogle Scholar |
Tsuji, T., Kamei, R., and Pratt, R. G., 2014a, Pore pressure distribution of a mega-splay fault system in the Nankai Trough subduction zone: insight into up-dip extent of the seismogenic zone: Earth and Planetary Science Letters, 396, 165–178
| Pore pressure distribution of a mega-splay fault system in the Nankai Trough subduction zone: insight into up-dip extent of the seismogenic zone:Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC2cXotFyhtL4%3D&md5=e2cd21c065876f6901b2180a93b7a0b0CAS |
Tsuji, T., Ashi, J., and Ikeda, Y., 2014b, Strike-slip motion of a mega-splay fault system in the Nankai oblique subduction zone: Earth, Planets, and Space, 66, 1–14
| Strike-slip motion of a mega-splay fault system in the Nankai oblique subduction zone:Crossref | GoogleScholarGoogle Scholar |
Tsuji, T., Ashi, J., Strasser, M., and Kimura, G., 2015, Identification of the static backstop and its influence on the evolution of the accretionary prism in the Nankai Trough: Earth and Planetary Science Letters, 431, 15–25
| Identification of the static backstop and its influence on the evolution of the accretionary prism in the Nankai Trough:Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC2MXhsFWht7fJ&md5=55686755e4839b1a39462c0025f421aaCAS |
Uchida, T., Lu, H.L., Tomaru, H., and the MITI Nankai Trough shipboard scientists 2004, Subsurface occurrence of natural gas hydrate in the Nankai Trough area: implication for gas hydrate concentration: Resource Geology, 54, 35–44
| Subsurface occurrence of natural gas hydrate in the Nankai Trough area: implication for gas hydrate concentration:Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD2cXltFWrsbY%3D&md5=87794b4e1333c8a86c9f7f986ae68d9eCAS |
Waite, W. F., Santamarina, J. C., Cortes, D. D., Dugan, B., Espinoza, D. N., Germaine, J., Jang, J., Jung, J. W., Kneafsey, T. J., Shin, H., Soga, K., Winters, W. J., and Yun, T. S., 2009, Physical properties of hydrate-bearing sediments: Reviews of Geophysics, 47, RG4003
| Physical properties of hydrate-bearing sediments:Crossref | GoogleScholarGoogle Scholar |
Wang, X. J., Wu, S. G., Lee, M., Guo, Y. Q., Yang, S. X., and Liang, J. Q., 2011, Gas hydrate saturation from acoustic impedance and resistivity logs in the Shenhu area, South China Sea: Marine and Petroleum Geology, 28, 1625–1633
| Gas hydrate saturation from acoustic impedance and resistivity logs in the Shenhu area, South China Sea:Crossref | GoogleScholarGoogle Scholar |
Waseda, A., and Uchida, T., 2004, Origin and migration of methane in gas hydrate-bearing sediments in the Nankai Trough: The Geochemical Society Special Publications, 9, 377–387
| Origin and migration of methane in gas hydrate-bearing sediments in the Nankai Trough:Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD2MXhslKgu7o%3D&md5=5aeb108726099c7b58260dc98820c324CAS |