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Abstract

Summary

Geological Carbon Storage (GCS) is called to play a critical role for accelerating the transition toward a lowcarbon economy during the remainder of the century. However, for making a significant contribution, GCS targets should be scaled-up from megatons (per year) to gigatons levels. Among other challenges, the ability to perform reliable Reservoir Modeling and Simulation is an important aspect needed for an optimal management of potential risks. The injection of large volumes of fluid has raised public awareness about potentially induced seismicity. Subsurface mechanisms that may trigger seismicity are numerous and complex, and affect the prediction capabilities of the standard simulation tools. Understanding and simulating the physics of these complex phenomena is an important part of TOTAL’s CCUS R&D program, as it is the company’s ambition to become a major actor in CO2 storage activity, while ensuring risk management and mitigation. To improve their understanding, we studied fundamental aspects related with Reservoir Modeling and Simulation in the GCS context.

This study is the first step towards enhancing our understanding of these complex phenomena. We revisited the role that the presence of fractures and faults has on reservoir containment. A coupled flow and geomechanics simulation was developed to investigate the influence of different parameters on the fault reactivation of critically stressed faults. We evaluated different experimental scenarios, which resulted in values of axial displacements in the range of from 15 m to 170 m, within a lab model that has a characteristic length of 20m. The worst-case scenario relates to a situation with pre-existing vertical fractures. Results indicate that the dynamics of the fault permeability is a critical factor, among those that have to be taken into account for CO2 injection scenarios in complex geological formations. In our view, these results confirm that uncertainty in the fault characterization needs to be taken into account for improved risk assessments associated with CO2 injection.

© EAGE Publications BV
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/content/papers/10.3997/2214-4609.202035154
2020-09-14
2024-04-19

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A Modeling Workflow for Geological Carbon Storage Integrated with Coupled Flow and Geomechanics Simulations
Conference Proceedings 2020, 1 (2020); https://doi.org/10.3997/2214-4609.202035154
/content/papers/10.3997/2214-4609.202035154
/content/papers/10.3997/2214-4609.202035154
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