Advanced InSAR Analysis of Groningen's Subsurface Deformation: Enhancing Understanding of Reservoir Rheology and Induced Seismicity Modeling
Description:
In the context of the increasing incidence of induced seismicity linked to hydrocarbon extraction, our study presents a comprehensive analysis of subsurface deformation at the Groningen gas field in the Netherlands, a notable example of seismic activity associated with gas production. Employing a multidisciplinary approach, we integrate InSAR data (RADARSAT2, TerraSAR-X, Sentinel-1), GNSS, and optical leveling to investigate the reservoir's time-dependent deformation. We leverage Independent Component Analysis (ICA) to distinguish deformation sources, offering insights into the intricate interplay of subsurface operations. We observed pronounced decadal subsidence across the Groningen field, with spatial variations in subsidence rates highlighting local compressibility differences. Notably, ICA uncovered significant seasonal fluctuations in the Norg area, with a 20 mm amplitude over a 5x5 km region, correlating with gas storage cycles and revealing a previously obscured deformation signal. Through comparative analysis of long-term subsidence and Norg's seasonal deformation against various model predictions, including linear poroelastic and rate-type compaction models (RTiCM), we identified evidence of inelastic compaction in the reservoir. This insight, manifested as a time-dependent increase in apparent compressibility (Cm), is pivotal for advancing seismicity forecast models. Our results contribute significantly to understanding the hydromechanical processes governing induced seismicity and highlight the need for integrated geomechanical modeling in managing seismic risks in Groningen and similar settings.
Session: Induced Earthquakes: Source Characteristics, Mechanisms, Stress Field Modeling and Hazards - III
Type: Oral
Date: 5/1/2024
Presentation Time: 03:00 PM (local time)
Presenting Author: Yuexin
Student Presenter: No
Invited Presentation:
Authors
Yuexin Li Presenting Author Corresponding Author yuexinli@caltech.edu California Institute of Technology |
Mateo Acosta acosta@caltech.edu California Institute of Technology |
Krittanon Sirorattanakul ksirorat@caltech.edu California Institute of Technology |
Stephen Bourne Stephen.Bourne@shell.com Shell |
Jean-Philippe Avouac avouac@caltech.edu California Institute of Technology |
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Advanced InSAR Analysis of Groningen's Subsurface Deformation: Enhancing Understanding of Reservoir Rheology and Induced Seismicity Modeling
Category
Induced Earthquakes: Source Characteristics, Mechanisms, Stress Field Modeling and Hazards