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OBS Data Analysis to Quantify Gas Hydrate and Free Gas in the South Shetland Margin (Antarctica)

Author

Listed:
  • Sha Song

    (Department of Geosciences, University of Padova, Via Gradenigo 6, 35131 Padova, Italy)

  • Umberta Tinivella

    (Istituto Nazionale di Oceanografia e di Geofisica Sperimentale—OGS, 34010 Sgonico, Italy)

  • Michela Giustiniani

    (Istituto Nazionale di Oceanografia e di Geofisica Sperimentale—OGS, 34010 Sgonico, Italy)

  • Sunny Singhroha

    (CAGE—Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geosciences, UiT The Arctic University of Norway, Dramsveien 201, 9010 Tromsø, Norway)

  • Stefan Bünz

    (CAGE—Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geosciences, UiT The Arctic University of Norway, Dramsveien 201, 9010 Tromsø, Norway)

  • Giorgio Cassiani

    (Department of Geosciences, University of Padova, Via Gradenigo 6, 35131 Padova, Italy)

Abstract

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.

Suggested Citation

  • Sha Song & Umberta Tinivella & Michela Giustiniani & Sunny Singhroha & Stefan Bünz & Giorgio Cassiani, 2018. "OBS Data Analysis to Quantify Gas Hydrate and Free Gas in the South Shetland Margin (Antarctica)," Energies, MDPI, vol. 11(12), pages 1-16, November.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:12:p:3290-:d:185405
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    References listed on IDEAS

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    1. Iván Vargas-Cordero & Umberta Tinivella & Lucía Villar-Muñoz & Joaquim P. Bento, 2018. "High Gas Hydrate and Free Gas Concentrations: An Explanation for Seeps Offshore South Mocha Island," Energies, MDPI, vol. 11(11), pages 1-13, November.
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    Cited by:

    1. Alberto Maria Gambelli & Umberta Tinivella & Rita Giovannetti & Beatrice Castellani & Michela Giustiniani & Andrea Rossi & Marco Zannotti & Federico Rossi, 2021. "Observation of the Main Natural Parameters Influencing the Formation of Gas Hydrates," Energies, MDPI, vol. 14(7), pages 1-25, March.

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