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Detection of Methane Hydrate‐Bearing Zones from Seismic Data
Author(s) -
Inamori Takao,
Hato Masami
Publication year - 2004
Publication title -
resource geology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.597
H-Index - 43
eISSN - 1751-3928
pISSN - 1344-1698
DOI - 10.1111/j.1751-3928.2004.tb00191.x
Subject(s) - geology , methane , borehole , hydrate , clathrate hydrate , submarine pipeline , bearing (navigation) , trough (economics) , well logging , petrology , methane gas , seismology , petroleum engineering , geotechnical engineering , ecology , chemistry , cartography , organic chemistry , macroeconomics , geography , economics , biology
. The MITI Nankai Trough wells were drilled offshore Japan in the Tokai area in 1999 and 2000. The occurrence of methane hydrate was confirmed by various indicators in the borehole logs and from core data. These findings have a large impact on potential future Japanese energy resources and other related‐scientific interests. We first tried to find the methane hydrate‐bearing zones using interval velocities derived from NMO velocity analysis. However, this analysis produced poor resolution. To achieve a more detailed delineation of the gas hydrate‐ and gas‐bearing zones, we executed a seismic impedance inversion calibrated by the logs from two of the MITI Nankai Trough wells. Although these two wells are only about 90 m apart, we were able to produce an impedance section with fine detail by adopting a simple initial model and incorporating physical properties of the methane hydrate‐bearing zones. The locations of the methane hydrate‐bearing zones are readily apparent in the final section.