HR: 10:50h
AN: OS12A-03    [Abstracts]
TI: Extraction of methane hydrate concentrated zone in the eastern Nankai Trough
AU: * Saeki, T
EM: saeki-tatsuo@jogmec.go.jp
AF: Japan Oil, Gas Metals National Corporation, 1-2-2, Hamada, Mihama-ku, Chiba, 261-0025, Japan
AU: Fujii, T
EM: fujii-tetsuya@jogmec.go.jp
AF: Japan Oil, Gas Metals National Corporation, 1-2-2, Hamada, Mihama-ku, Chiba, 261-0025, Japan
AU: Inamori, T
EM: inamori-takao@jogmec.go.jp
AF: Japan Oil, Gas Metals National Corporation, 1-2-2, Hamada, Mihama-ku, Chiba, 261-0025, Japan
AU: Kobayashi, T
EM: kobayashi-toshiaki@jogmec.go.jp
AF: Japan Oil, Gas Metals National Corporation, 1-2-2, Hamada, Mihama-ku, Chiba, 261-0025, Japan
AU: Hayashi, M
EM: hayashi-masao@jogmec.go.jp
AF: Japan Oil, Gas Metals National Corporation, 1-2-2, Hamada, Mihama-ku, Chiba, 261-0025, Japan
AU: Nagakubo, S
EM: nagakubo-sadao@jogmec.go.jp
AF: Japan Oil, Gas Metals National Corporation, 1-2-2, Hamada, Mihama-ku, Chiba, 261-0025, Japan
AU: Takano, O
EM: takano-osamu@jogmec.go.jp
AF: Japan Oil, Gas Metals National Corporation, 1-2-2, Hamada, Mihama-ku, Chiba, 261-0025, Japan
AB: Methane hydrate, a solid compound formed from methane and water, occurs naturally in permafrost regions on- land and in deep continental slopes offshore and has been examined as future energy resources. The existence of methane hydrate in the eastern Nankai Trough region, offshore Japan, was confirmed by drilling the MITI well gNankai Troughh in 1999. Aiming commercialization of methane hydrate production, the Research Consortium for Methane Hydrate Resources in Japan (MH21) has been executing geological and geophysical surveys around the eastern Nankai Trough since 2001 as a nation project. Interpretation and analysis studies based on 2D/3D reflection seismic surveys, multi-wells drilling campaign and other geological surveys revealed existences of methane hydrate concentrated zones, of which reserves were constructed with turbidite sand layers. In the view of resource explorations, methane hydrate concentrated zones are more attractive than other methane hydrate bearing zones because they can save much amount of methane hydrate locally. We developed the geological interpretation workflow optimized for delineation of methane hydrate concentrated zones. The workflow consists of following 4 factors: (1) BSR interpretation, (2) Delineation of turbidite sand bodies, (3) Detection of Strong seismic reflectors suggesting methane hydrate concentrated sand layers, and (4) high density velocity analysis. It enabled in the eastern Nankai Trough to extract methane hydrate concentrated zones and evaluate their rock volume successfully.
DE: 3004 Gas and hydrate systems
SC: Ocean Sciences [OS]
MN: 2007 Fall Meeting