Journal
ENERGIES
Volume 11, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/en11123290
Keywords
gas hydrate; free gas; ocean-bottom seismometer; PS-converted wave; travel time tomography; South Shetland margin
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Funding
- Italian Ministry of Education, Universities and Research (Decreto MIUR) [631]
- China Scholarship Council [201506400061]
- Management Committee of the COST-MIGRATE Action [ES1405-050317-082155]
- Research Council of Norway through its Centres of Excellence funding scheme [223259]
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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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