OBS data analysis to quantify gas hydrate and free gas in the South Shetland margin (Antarctica)

Sha Song, Umberta Tinivella, Michela Giustiniani, Sunny Singhroha, Stefan Bünz, Giorgio Cassiani

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

10 Citationer (Scopus)

Resumé

The presence of a gas hydrate reservoir and free gas layer along the South Shetland margin (offshore Antarctic Peninsula) has been well documented in recent years. In order to better characterize gas hydrate reservoirs, with a particular focus on the quantification of gas hydrate and free gas and the petrophysical properties of the subsurface, we performed travel time inversion of ocean-bottom seismometer data in order to obtain detailed P- and S-wave velocity estimates of the sediments. The P-wave velocity field is determined by the inversion of P-wave refractions and reflections, while the S-wave velocity field is obtained from converted-wave reflections received on the horizontal components of ocean-bottom seismometer data. The resulting velocity fields are used to estimate gas hydrate and free gas concentrations using a modified Biot-Geertsma-Smit theory. The results show that hydrate concentration ranges from 10% to 15% of total volume and free gas concentration is approximately 0.3% to 0.8% of total volume. The comparison of Poisson’s ratio with previous studies in this area indicates that the gas hydrate reservoir shows no significant regional variations.

OriginalsprogEngelsk
Artikelnummer3290
Antal sider16
TidsskriftEnergies
Vol/bind11
Udgave nummer12
DOI
StatusUdgivet - 1 dec. 2018
Udgivet eksterntJa

Programområde

  • Programområde 5: Natur og klima
  • Programområde 3: Energiressourcer

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