Boletín de Geología

Vol. 44 Núm. 3 (2022): Boletín de Geología
Artículos científicos

Caracterización geoquímica y geomecánica de la Formación Mungaroo, offshore del noroeste de Australia

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  • Carlos Fernando Caicedo-Amaya,
  • Rocio Bernal-Olaya,
  • Erick Johan Illidge-Araujo
Carlos Fernando Caicedo-Amaya
Universidad Industrial de Santander
Rocio Bernal-Olaya
Universidad Industrial de Santander
Erick Johan Illidge-Araujo
Ecopetrol
DOI: https://doi.org/10.18273/revbol.v44n3-2022004

Publicado 2022-10-26

Palabras clave

  • Historias de enterramiento,
  • Flujo termal,
  • Cocinas,
  • Fragilidad

Cómo citar

Caicedo-Amaya, C. F., Bernal-Olaya, R., & Illidge-Araujo, E. J. (2022). Caracterización geoquímica y geomecánica de la Formación Mungaroo, offshore del noroeste de Australia. Boletín De Geología, 44(3), 95–117. https://doi.org/10.18273/revbol.v44n3-2022004

Derechos de autor 2022 Boletín de Geología

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Esta obra está bajo una licencia internacional Creative Commons Atribución 4.0.

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Resumen

La caracterización geoquímica de las rocas de la Formación Mungaroo muestra la presencia de kerógeno III y II/III, lo cual caracteriza al Exmouth Plateau como una cuenca con potencial gasífero. Usando trece historias de enterramiento elaboradas con datos de pozo, identificamos tres tendencias: una con altas tasas de sedimentación durante el Triásico Medio y el Triásico Tardío (69,3-95,3 m/Ma), una con altas tasas de sedimentación durante el Cretácico Medio y Tardío (67-158 m/Ma) y, por último, una con tasas de sedimentación bajas durante el Cretácico Tardío hasta el presente (18-40 m/Ma). Estas tendencias definen zonas activas de generación (o cocinas) entre 2,000 y 4,400 km2. Las altas tasas de sedimentación durante el Triásico y el Cretácico fueron fundamentales para que la Formación Mungaroo alcanzara las profundidades necesarias para transformar su materia orgánica. Por otro lado, en la zona con tasas de sedimentación baja, el flujo termal radiogénico fue fundamental para la transformación de esta materia orgánica. La generación/expulsión de estos shales ocurre desde hace más de 100 Ma, lo que explica las grandes acumulaciones de gas en la subcuenca. Actualmente, la formación Mungaroo se encuentra en ventana de generación de gas, a 4,500-4,800 a 5,500 m de profundidad bajo el nivel del mar. Los shales de esta unidad presentan valores de TOC mayores a 2% y alcanzan la ventana de generación de gas (Ro% >1,3), sugiriendo su potencial como un posible yacimiento no convencional de gas. Sin embargo, características geomecánicas, como su poca fragilidad, baja sobrepresión y espesor descartan su potencial no convencional.

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