Detection of methane hydrate-bearing zones from seismic data

Takao Inamori*, Masami Hato

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)99-104
Number of pages6
JournalResource Geology
Issue number1
Publication statusPublished - 2004 Mar 1
Externally publishedYes


  • Impedance
  • Methane hydrate
  • Seismic inversion
  • Sonic
  • Velocity
  • VSP

ASJC Scopus subject areas

  • Geology
  • Geochemistry and Petrology


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