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Energies 2017, 10(12), 2154; https://doi.org/10.3390/en10122154

Gas Hydrate and Free Gas Concentrations in Two Sites inside the Chilean Margin (Itata and Valdivia Offshores)

1
Facultad de Ingeniería, Universidad Andres Bello (UNAB), Quillota 980, 2531015 Viña del Mar, Chile
2
Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS), Borgo Grotta 42C, 34010 Trieste, Italy
3
GEOMAR, Helmholtz Centre for Ocean Research, Wischhofstr 1-3, 24148 Kiel, Germany
*
Author to whom correspondence should be addressed.
Received: 31 October 2017 / Revised: 23 November 2017 / Accepted: 26 November 2017 / Published: 16 December 2017
(This article belongs to the Section Energy Sources)
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Abstract

Two sectors, Itata and Valdivia, which are located in the Chilean margin were analysed by using seismic data with the main purpose to characterize the gas hydrate concentration. Strong lateral velocity variations are recognised, showing a maximum value in Valdivia offshore (2380 ms−1 above the BSR) and a minimum value in the Itata offshore (1380 m·s−1 below the BSR). In both of the sectors, the maximum hydrate concentration reaches 17% of total volume, while the maximum free gas concentration is located Valdivia offshore (0.6% of total volume) in correspondence of an uplift sector. In the Itata offshore, the geothermal gradient that is estimated is variable and ranges from 32 °C·km−1 to 87 °C·km−1, while in Valdivia offshore it is uniform and about 35 °C·km−1. When considering both sites, the highest hydrate concentration is located in the accretionary prism (Valdivia offshore) and highest free gas concentration is distributed upwards, which may be considered as a natural pathway for lateral fluid migration. The results that are presented here contribute to the global knowledge of the relationship between hydrate/free gas presence and tectonic features, such as faults and folds, and furnishes a piece of the regional hydrate potentiality Chile offshore. View Full-Text
Keywords: gas hydrate; BSR; seismic velocity; gas-phase concentration; pre-stack depth migration; Chilean margin gas hydrate; BSR; seismic velocity; gas-phase concentration; pre-stack depth migration; Chilean margin
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Iván, V.-C.; Umberta, T.; Lucía, V.-M. Gas Hydrate and Free Gas Concentrations in Two Sites inside the Chilean Margin (Itata and Valdivia Offshores). Energies 2017, 10, 2154.

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