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Percolación de fluidos con ayuda de la deformación en sales de roca
Soheil Ghanbarzadeh1, Marc A Hesse2, Maša Prodanović1
1Department of Petroleum and Geosystems Engineering, The University of Texas at Austin, 200 East Dean Keeton Street, Austin, TX 78712, USA.
Science (New York, N.Y.)
|November 28, 2015
Resumen
La deformación puede permitir el flujo de fluidos en la sal de roca, incluso por debajo del umbral de percolación estática. Este hallazgo es crucial para el diseño de depósitos de residuos nucleares para evitar fugas.
Área de la Ciencia:
- Geología
- La geofísica
- Ciencias de los materiales
Sus antecedentes:
- El almacenamiento geológico profundo de residuos nucleares se basa en la baja permeabilidad de la sal de roca para aislar el agua subterránea.
- Un umbral de percolación típicamente limita el flujo de fluido en la sal de roca estática.
Objetivo del estudio:
- Investigar si la deformación puede superar el umbral de percolación estática en la sal de roca.
- Evaluar las implicaciones para el flujo de fluidos en el diseño de los depósitos de residuos nucleares.
Principales métodos:
- Experimentos estáticos con muestras de sal sintética mediante microtomografía de rayos X.
- Análisis de las distribuciones de hidrocarburos en los depósitos de sal del Golfo de México.
Principales resultados:
- Se confirmó la existencia de un umbral de percolación en muestras estáticas de sal.
- Las distribuciones de hidrocarburos observadas que indican la percolación se produjeron en porosidades por debajo del umbral estático en la sal deformante.
- Se identificó la percolación asistida por deformación como el mecanismo.
Conclusiones:
- La deformación puede facilitar la percolación de líquido en la sal de roca en porosidades por debajo del umbral estático.
- Los diseños de los depósitos de residuos nucleares deben tener en cuenta la percolación de fluidos provocada por la deformación.
- Los umbrales de percolación estática pueden no ser suficientes para limitar el flujo de fluidos en entornos geológicos deformados.
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