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Título del libro: 55th U.S. Rock Mechanics / Geomechanics Symposium 2021
Título del capítulo: Seismic Response to Fluid Injection in Faulted Geothermal Reservoirs: A Case Example from Iceland

Autores UNAM:
VALA HJORLEIFSDOTTIR;

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Autores externos:

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Idioma:

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Año de publicación:
2021

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Palabras clave:

Flow of fluids; Geothermal fields; Geothermal wells; Induced Seismicity; K-means clustering; Rock mechanics; Fault structure; Fluid injections; Fluid-flow; Geothermal reservoir; Icelands; Injection period; Injection rates; Injection wells; K-means++ clustering; Seismic event; Seismic response

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Resumen:

Seismic response to fluid injection at the Húsmúli area within the Hellisheiði geothermal field in Iceland was investigated by correlating induced seismicity with fault structures and fluid injection rates. Induced seismicity recorded around five injection wells over a half-year fluid injection period was first analysed using the k-means clustering model, which identified two clusters associated with the injection wells studied. Based on the clustered seismic events, the geometry of the injected fluid flow was estimated using the spatial density of seismic events. A statistical approach, using locations of three seismic events to identify one fracture plane, was utilised to identify the dominant fault structures, which spatially correlate well with local fault structures dominating the fluid flow. In the temporal domain, the fluid injection rate and wellhead pressure for the five wells were separately analysed against the seismic response, which shows that the seismic frequency and the b value increased along with local fluctuations of injection rate and pressure in the controlling system. It can be concluded that the integrated analysis of induced seismicity, fault structures and fluid injection in spatial-temporal domains is crucial to understand the seismic response to fluid injection in faulted/fractured geothermal reservoirs. © 2021 ARMA, American Rock Mechanics Association.

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Entidades citadas de la UNAM:

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Fuente:


ISBN:
9781713839125
Editorial:
American Rock Mechanics Association (ARMA)

Tipo de producto:
Conference Paper