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Abstract

Fukuhara, M., V. Tertychnyi, K. Fujii, V. Shako, V. Pimenov, Y. Popov, D. Murray, and T. Fujii, 2009, Temperature monitoring results for methane-hydrate sediments in the Nankai Trough, Japan, in T. Collett, A. Johnson, C. Knapp, and R. Boswell, eds., Natural gas hydrates—Energy resource potential and associated geologic hazards: AAPG Memoir 89, p. 414432.

DOI:10.1306/13201114M893352

Copyright copy2009 by The American Association of Petroleum Geologists.

Temperature Monitoring Results for Methane-hydrate Sediments in the Nankai Trough, Japan

Masafumi Fukuhara,1 Vladimir Tertychnyi,2 Kasumi Fujii,3 Valery Shako,4 Viacheslav Pimenov,5 Yuri Popov,6 Doug Murray,7 Tetsuya Fujii8

1Schlumberger Moscow Research Center, Moscow, Russia
2Schlumberger Moscow Research Center, Moscow, Russia
3Schlumberger K.K., Kanagawa, Japan
4Russian State Geological Prospecting University, Moscow, Russia
5Russian State Geological Prospecting University, Moscow, Russia
6Russian State Geological Prospecting University, Moscow, Russia
7Schlumberger China S.A., Beijing, China
8Japan Oil, Gas and Metals National Corporation, Chiba, Japan

ACKNOWLEDGMENTS

This research was conducted under the MH21 Research Consortium funded by the Japan METI. The authors thank the MH21 main groups of JOGMEC, National Institute of Advanced Industrial Science and Technology (AIST), and Engineering Advancement Association of Japan (ENAA) and their personnel for the permission to publish this article. Parts of the study were conducted with the cooperation of Schlumberger Oilfield Services.

We thank O. Matsubayashi and the scientists at Russian State Geological Prospecting University for the interpretation of the data. We also thank R. Matsumoto and R. Kleinberg for a fruitful discussion of this study.

ABSTRACT

The Japan Oil, Gas and Metals National Corporation (JOGMEC) conducted the Kisoshisui (Tokaioki-Kumanonada) drilling campaign in the Nankai Trough area during 2003–2004 as part of the activities of the MH21 Research Consortium, which is supported by the Ministry of Economy, Trade and Industry (METI). Through this campaign, various subsea hydrate studies were conducted using various data, including logging while drilling, wireline, coring, and temperature measurement. Using recent technology, a precise in-situ temperature measurement system was successfully developed and deployed at the beginning of the drilling campaign. The goals of the study were to determine whether the measurement system and setup can reliably measure the equilibrium in-situ formation temperature, to determine if the measurements adequately delineate the geothermal gradient, and to identify any disturbances in the thermal regime of the hydrate-bearing sediment and the possible causes of the disturbances. The temperature of the hydrate-bearing sediment was monitored in a deep-water well for 1.5 months. Because the measurements were collected over a long period of time, the equilibrated formation temperatures could be readily determined after observing the thermal relaxation from drilling and sensor deployment effects. The temperature profile and the temperature gradient through the hydrate-bearing zone were estimated in a quasi–steady-state condition. A correlation between the tidal cycle and sea-floor temperature change is also discussed.

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