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Microseismic monitoring of a CO2 Injection: the case study at In Salah, AlgeriaNormal access

Authors: B.P. Goertz-Allmann, V. Oye, K. Iranpour, D. Kühn, E. Aker and B. Bohloli
Event name: 4th EAGE Passive Seismic Workshop
Session: Surface Monitoring
Publication date: 17 March 2013
DOI: 10.3997/2214-4609.20142368
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 782.96Kb )
Price: € 20

Summary:
We analyze microseismic data induced during CO2 injection at In Salah, Algeria. We detected over 5000 microseismic events using a master event waveform cross-correlation approach. Interpretation of the microseismic events is mainly based on S-P wave onset times and polarization angles of the P-waves but also includes source parameter determination. Events can be classified in various event clusters according to their S-P traveltimes and azimuth. The microseismic activity shows correlation between seismological parameters and injection data. Moment magnitudes have been determined in the frequency domain. Most magnitude estimates are between -1 and 0, with a few larger magnitude events up to Mw 1. B-values of events clusters have been determined and show significant variations between the clusters.


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