Using geomechanical models to simulate induced seismicity: Application to CO2 storage at In Salah, Algeria

James P. Verdon, Anna L. Stork, Rob C. Bissell, Clare E. Bond

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

Abstract

We demonstrate a workflow to simulate seismicity generated by CO2 injection into the In Salah field, Algeria. Seismic activity in hydrocarbon reservoirs is caused by stress changes on pre-existing fractures that lead to their reactivation. As inputs to our workflow, a history-matched reservoir flow simulation is used to model changes in pressure caused by injection; while a geomechanical model gives the stress state at each node of the flow model. The locations, lengths, and orientations of pre-existing fractures in the reservoir are modeled via a mass-spring solver, which restores the faulted, folded reservoir to its initial, undeformed conditions. This algorithm predicts the intensity and orientation of strain through the model, from which fracture sets can be generated. To simulate seismicity during CO2 injection, we compute changes in effective stress caused by pore pressure changes, and map these stress changes into shear and normal stresses acting on the fractures. Where stresses exceed Mohr-Coulomb failure criteria, seismic events are predicted. We compare our modeled events with observed seismicity at In Salah, finding excellent agreement between model and observation in terms of event timing, event location, and event magnitude.

Original languageEnglish
Title of host publicationSociety of Exploration Geophysicists International Exposition and 84th Annual Meeting SEG 2014
PublisherSociety of Exploration Geophysicists
Pages4559-4563
Number of pages5
ISBN (Print)9781634394857
DOIs
Publication statusPublished - 1 Jan 2014
EventSociety of Exploration Geophysicists International Exposition and 84th Annual Meeting SEG 2014 - Denver, United States
Duration: 26 Oct 201431 Oct 2014

Conference

ConferenceSociety of Exploration Geophysicists International Exposition and 84th Annual Meeting SEG 2014
CountryUnited States
CityDenver
Period26/10/1431/10/14

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