Temperature Monitoring Results for Methane-hydrate Sediments in the Nankai Trough, Japan
Masafumi Fukuhara, Vladimir Tertychnyi, Kasumi Fujii, Valery Shako, Viacheslav Pimenov, Yuri Popov, Doug Murray, Tetsuya Fujii, 2009. "Temperature Monitoring Results for Methane-hydrate Sediments in the Nankai Trough, Japan", Natural Gas Hydrates—Energy Resource Potential and Associated Geologic Hazards, T. Collett, A. Johnson, C. Knapp, R. Boswell
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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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Natural Gas Hydrates—Energy Resource Potential and Associated Geologic Hazards
In September 2004, the American Association of Petroleum Geologists (AAPG) convened a Hedberg Research Conference in Vancouver, British Columbia, Canada titled "Natural Gas Hydrates: Energy Resource Potential and Associated Geologic Hazards." As a continuation of the Hedberg Research Conference in Vancouver, the conveners of the conference and the editors of this Memoir have worked with more than 150 authors and coauthors to prepare this Memoir on gas hydrates. This publication follows the goals of the Hedberg conference; however, the contents of this Memoir were expanded to include all aspects of gas hydrates in nature. This Memoir contains 39 individual contributions, ranging from long topical summaries to shorter focused research papers. This Memoir has been published in two parts, with digital versions of all the complete research papers included on the enclosed CD. The hardcopy portion of the Memoir includes abstracts and several key figures for each of the contributions along with a complete copy of a gas hydrate technical review. The digital portion of this Memoir has been organized into a series of topical sections consisting of review articles, marine gas hydrate papers, and gas hydrate laboratory and modeling studies. Because of the rapidly emerging worldwide interest in gas hydrates, this comprehensive treatise on the geology of gas hydrates will be valuable to both the gas hydrate research community and exploration/development geologists working in arctic and deep marine environments.