Application of AVO analysis to seismic data for detection of gas below methane hydrate stability zone in Nankai Trough area

Masami Hato, Takao Inamori, Alfian Bahar, Toshifumi Matsuoka

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

For the purpose of development of methane hydrate, occurring in the deep marine subsurface, as a resource, the most important issue is to understand the methane hydrate system (generation, migration and accumulation) as well as to delineate the methane hydrate reservoir properties. We have applied the Amplitude Versus Offset (AVO) analysis to the seismic data acquired in the Nankai Trough, offshore Japan, in order to confirm the occurrence of gas just below the methane hydrate-bearing zone, assuming that gas will show a so-called Class-3 AVO response. Knowledge of the amount and occurrence of gas in the sediment below methane hydrate-bearing zone is one of the keys to understand the methane hydrate system. We have utilized the qualitative analysis of AVO methodology to delineate how gas is located below the BSR, which is thought to be the reflection event from the interface between the methane hydrate-bearing zone and the underlying gas-bearing zone. In the region of MITI Nankai Trough Well PSW-3, we observe two BSRs separated by 25 ms. After AVO modeling using well data, we applied AVO attribute analysis and attribute crossplot analysis to the seismic data. Finally we applied an offset-amplitude analysis to CMP gather data at specific locations to confirm the results of AVO attribute analysis. The AVO analysis shows that there is very little gas located in the underlying sediment below methane hydrate-bearing zone. This result supports the fact that we could not obtain any clear evidence of gas occurrence just below the methane hydrate-bearing zone in the Nankai Trough well drilling.

Original languageEnglish
Pages (from-to)105-113
Number of pages9
JournalResource Geology
Volume54
Issue number1
DOIs
Publication statusPublished - 2004 Mar 1
Externally publishedYes

Fingerprint

Methane
Hydrates
Bearings (structural)
seismic data
trough
Gases
methane
gas
Sediments
Well drilling
Cytidine Monophosphate
analysis
detection
Gas bearings
qualitative analysis
sediment
drilling
methodology
resource

Keywords

  • AVO analysis
  • BSR
  • Free gas
  • Methane hydrate

ASJC Scopus subject areas

  • Geology
  • Geochemistry and Petrology

Cite this

Application of AVO analysis to seismic data for detection of gas below methane hydrate stability zone in Nankai Trough area. / Hato, Masami; Inamori, Takao; Bahar, Alfian; Matsuoka, Toshifumi.

In: Resource Geology, Vol. 54, No. 1, 01.03.2004, p. 105-113.

Research output: Contribution to journalArticle

Hato, Masami ; Inamori, Takao ; Bahar, Alfian ; Matsuoka, Toshifumi. / Application of AVO analysis to seismic data for detection of gas below methane hydrate stability zone in Nankai Trough area. In: Resource Geology. 2004 ; Vol. 54, No. 1. pp. 105-113.
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