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Reservorios de gas libre bajo presión crítica por debajo de las provincias de hidrato de gas
Matthew J Hornbach1, Demian M Saffer, W Steven Holbrook
1Department of Geology and Geophysics, University of Wyoming, Laramie, Wyoming 82071, USA. mhornbac@uwyo.edu
Nature
|January 9, 2004
Resumen
Los hidratos de metano influyen en el cambio climático, pero los mecanismos de liberación no están claros. Este estudio revela una zona crítica de gas libre debajo de los hidratos, lo que sugiere sensibilidad al calentamiento y potencial para una rápida liberación de metano.
Área de la Ciencia:
- Ciencias de la Tierra Ciencias de la Tierra Ciencias de la Tierra
- Ciencias del clima Ciencias del clima Ciencias del clima
- La geofísica es la geofísica.
Sus antecedentes:
- Los datos paleoceanográficos sugieren que los hidratos de metano impactan el clima global.
- El mecanismo de liberación de metano durante los eventos de calentamiento es poco conocido.
- La zona de gas libre debajo de las provincias de hidratos no tiene restricciones.
Objetivo del estudio:
- Para evaluar la regulación mecánica del grosor de la zona de gas libre por deslizamiento de falla.
- Comprender la sensibilidad de las provincias hidratadas a los cambios ambientales.
- Para cuantificar la liberación potencial de metano de los depósitos de gas libre.
Principales métodos:
- Análisis mecánico del deslizamiento de falla y el grosor de la columna de gas.
- Modelado de la dinámica de la zona de gas libre.
- Estimación del tamaño global del depósito de gas libre.
Principales resultados:
- Existe un grosor crítico de la columna de gas por debajo de la mayoría de las provincias de hidrato de cuenca.
- Estas provincias son mecánicamente inestables y sensibles a los cambios ambientales.
- El depósito global de gas libre puede contener una porción significativa del total de metano ligado al hidrato.
Conclusiones:
- El deslizamiento de fallas puede regular mecánicamente el espesor máximo de las zonas de gas libre interconectadas.
- Las provincias de hidratos de gas están listas para el fracaso, lo que indica una alta sensibilidad al cambio climático.
- Un aumento de 5 ° C en la temperatura del fondo marino podría liberar ~ 2,000 Gt de metano, proporcionando un mecanismo de liberación rápida.
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