Microseismic Monitoring and Interpretation of Injection Data from the in Salah CO₂ Storage Site (Krechba), Algeria

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• 作者：Volker Oye ; Eyvind Aker ; Thomas M. Daley ; Daniela K¨¹hn ; Bahman Bohloli ; Valeri Korneev
• 关键词：CO2 storage ; injection ; monitoring ; microearthquakes ; seismicity ; fracturing ; instrumentation
• 刊名：Energy Procedia
• 出版年：2013
• 出版时间：2013
• 年：2013
• 卷：37
• 期：Complete
• 页码：4191-4198
• 全文大小：2161 K

文摘

Microseismic data analysis together with interpretation of injection data at the In Salah CO₂ storage site provides a valuable tool for improved understanding of the subsurface injection and storage processes. More than 1500 microseismic events have been detected semi-automatically between August 2009 and May 2012 and the occurrence of the events correlates clearly with increased injection rates and well-head pressures. Most likely the fracture pressure has been exceeded temporarily, resulting in a sudden increase of microseismicity. Waveform cross- correlation of the events demonstrates that most events occur in three distinct clusters. Clusters with shorter S-P wave differential travel times clearly correlate with the CO₂ injection at KB502, whereas events with larger S-P wave times do not. An uncertainty analysis and a network design study conclude that a more extensive microseismic network would be needed to resolve locations and potential correlations with injection data.