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Eventos isotrópicos observados con una matriz de pozos en la zona de falla de Chelungpu, Taiwán
Kuo-Fong Ma1, Yen-Yu Lin, Shiann-Jong Lee
1Department of Earth Sciences, and Institute of Geophysics, National Central University, Taiwan, Republic of China. fong@ncu.edu.tw
Science (New York, N.Y.)
|July 28, 2012
Resumen
Los investigadores observaron eventos sísmicos en Taiwán.
Área de la Ciencia:
- La geofísica es la geofísica.
- Sismología Sismología.
- Mecánica de las rocas Mecánica de las rocas.
Sus antecedentes:
- La falla de cizallamiento domina los procesos sísmicos en las zonas de falla.
- La alta presión del fluido puede inducir la falla de la roca, pero la observación directa en las zonas de falla es insuficiente.
Objetivo del estudio:
- Para investigar eventos sísmicos potencialmente causados por la alta presión del fluido en una zona de falla.
- Comprender los mecanismos de la fracturación hidráulica natural en áreas sísmicamente activas.
Principales métodos:
- Análisis de datos sísmicos de la matriz de pozos de perforación de la zona de fallas de Chelungpu, Taiwán.
- Modelado de los mecanismos de origen de eventos sísmicos.
Principales resultados:
- Se observaron pequeños eventos sísmicos (tipo I) en una zona rica en fluidos por debajo de la zona de deslizamiento principal.
- Eventos modelados como si tuvieran un mecanismo de fuente isotrópico, no cortante.
- Los eventos interpretados como potencialmente representando fracturas hidráulicas naturales.
Conclusiones:
- Proporcionó una observación directa de la ruptura de roca inducida por la presión del fluido en una zona de falla.
- Eventos sísmicos vinculados a la formación de fracturas hidráulicas naturales y características de fluidos.
- Similaridad sugerida entre estos procesos naturales y la fracturación hidráulica artificial.
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