Análisis sísmico-acústico de alta resolución del gas somero en la Ría de Muros-Noia (NO España)
- Autores: J. Magariños Álvarez, Soledad García Gil, Federico Vilas Martín
- Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 3, 1, 2001 (Ejemplar dedicado a: XIV Congreso Nacional de Sedimentología, IV Congreso del Cretácico de España), págs. 203-206
- Idioma: español
- Enlaces
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Resumen
Analysis and interpretation of high-resolution seismic reflection and side-scan sonar records has been performed in order to detect shallow gas signatures in the Rfa de Muros-Noia (NW Spain).
Four main types of gas accumulations have been distinguished: I) acoustic blanking s.s., with a flat top surface and kilometric extent, 2) acoustic curtains, with a convex top surface and less than a hundred meters of lateral extent, 3) acoustic columns, with an enhanced reflector at the top, and 4) acoustic turbidity. Mapping of these features reveals the presence of a large gas field where gas accumulates from the close seabed surface up to 8 m. Two gas escape features have been also recognised: I) acoustic plumes into the water column, rising up to 20 m above the seafloor, and 2) pockmarks on the present seabed, easily recognised as high reflectivity areas in the side-scan sonar records.
