OBS Data Analysis to Quantify Gas Hydrate and Free Gas in the South Shetland Margin (Antarctica)
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 th...
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| Format: | Article |
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MDPI AG
2018-11-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/11/12/3290 |
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| author | Sha Song Umberta Tinivella Michela Giustiniani Sunny Singhroha Stefan Bünz Giorgio Cassiani |
| author_facet | Sha Song Umberta Tinivella Michela Giustiniani Sunny Singhroha Stefan Bünz Giorgio Cassiani |
| author_sort | Sha Song |
| collection | DOAJ |
| description | 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. |
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| id | doaj.art-0539c71b7180489ab182b3112ad87a1b |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-13T07:54:11Z |
| publishDate | 2018-11-01 |
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| series | Energies |
| spelling | doaj.art-0539c71b7180489ab182b3112ad87a1b2022-12-22T02:55:27ZengMDPI AGEnergies1996-10732018-11-011112329010.3390/en11123290en11123290OBS Data Analysis to Quantify Gas Hydrate and Free Gas in the South Shetland Margin (Antarctica)Sha Song0Umberta Tinivella1Michela Giustiniani2Sunny Singhroha3Stefan Bünz4Giorgio Cassiani5Department of Geosciences, University of Padova, Via Gradenigo 6, 35131 Padova, ItalyIstituto Nazionale di Oceanografia e di Geofisica Sperimentale—OGS, 34010 Sgonico, ItalyIstituto Nazionale di Oceanografia e di Geofisica Sperimentale—OGS, 34010 Sgonico, ItalyCAGE—Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geosciences, UiT The Arctic University of Norway, Dramsveien 201, 9010 Tromsø, NorwayCAGE—Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geosciences, UiT The Arctic University of Norway, Dramsveien 201, 9010 Tromsø, NorwayDepartment of Geosciences, University of Padova, Via Gradenigo 6, 35131 Padova, ItalyThe 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.https://www.mdpi.com/1996-1073/11/12/3290gas hydratefree gasocean-bottom seismometerPS-converted wavetravel time tomographySouth Shetland margin |
| spellingShingle | Sha Song Umberta Tinivella Michela Giustiniani Sunny Singhroha Stefan Bünz Giorgio Cassiani OBS Data Analysis to Quantify Gas Hydrate and Free Gas in the South Shetland Margin (Antarctica) Energies gas hydrate free gas ocean-bottom seismometer PS-converted wave travel time tomography South Shetland margin |
| title | OBS Data Analysis to Quantify Gas Hydrate and Free Gas in the South Shetland Margin (Antarctica) |
| title_full | OBS Data Analysis to Quantify Gas Hydrate and Free Gas in the South Shetland Margin (Antarctica) |
| title_fullStr | OBS Data Analysis to Quantify Gas Hydrate and Free Gas in the South Shetland Margin (Antarctica) |
| title_full_unstemmed | OBS Data Analysis to Quantify Gas Hydrate and Free Gas in the South Shetland Margin (Antarctica) |
| title_short | OBS Data Analysis to Quantify Gas Hydrate and Free Gas in the South Shetland Margin (Antarctica) |
| title_sort | obs data analysis to quantify gas hydrate and free gas in the south shetland margin antarctica |
| topic | gas hydrate free gas ocean-bottom seismometer PS-converted wave travel time tomography South Shetland margin |
| url | https://www.mdpi.com/1996-1073/11/12/3290 |
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