Analyses of bottom simulating reflections offshore Arauco and Coyhaique (Chile)

Ivan de la Cruz Vargas Cordero, Umberta Tinivella, Flavio Accaino, Maria Filomena Loreto, Francesco Fanucci, Christian Reichert

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Two seismic sections offshore Arauco and Coyhaique, Chile, have been analysed to better define the seismic character of hydrate-bearing sediments. The velocity analysis was used to estimate the gas-phase concentration, which can serve to correlate hydrate presence to the geological features. The velocity model allowed us to recognise the hydrate layer above the bottom simulating reflector (BSR), and the free gas layer below it. The velocity field is affected by strong lateral variation, showing maximum (above the BSR) and minimum (below the BSR) values in the southern sector. Here, highest gas hydrate and free gas concentrations were calculated (15% and 2.7% of total volume respectively). The estimated geothermal gradient ranges from 35 to 95°C/km. In the northern sector, the highest gas hydrate and free gas concentrations are 15% and 0.2% of total volume respectively, and the geothermal gradient is uniform and equal to about 30°C/km.

Original languageEnglish
Pages (from-to)271-281
Number of pages11
JournalGeo-Marine Letters
Volume30
Issue number3-4
DOIs
Publication statusPublished - 1 Jan 2010

ASJC Scopus subject areas

  • Oceanography
  • Environmental Science (miscellaneous)
  • Geotechnical Engineering and Engineering Geology
  • Earth and Planetary Sciences (miscellaneous)

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