First Field Example of Remediation of Unwanted Migration from a Natural CO₂ Reservoir: The Bečej Field, Serbia

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• 作者：D. Karas^a ; I. Demić^a ; K. Kultysheva^a ; A. Antropov^a ; M. Blagojević^a ; F. Neele^b ; M. Pluymaekers^b ; B. Orlić^b ; ^{bogdan.orlic@tno.nl" class="auth_mail" title="E-mail the corresponding author}
• 关键词：CO2 storage ; CO2 leakage ; leakage remediation ; leakage mitigation ; Bečej CO2 field.
• 刊名：Energy Procedia
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：86
• 期：Complete
• 页码：69-78
• 全文大小：1034 K

文摘

The Bečej field, discovered in 1951 by the Petroleum Industry of Serbia (NIS), is one of the largest natural CO₂ fields in Europe. Uncontrolled migration of CO₂ out of the main reservoir, leading to subsurface seepage and surface leakage, was caused by the Bč-5 well blowout in 1968. Remediation measures were deployed in 2007 to reduce and prevent further leakage of CO₂ from the Bečej natural CO₂ field. To the best of our knowledge, this is the first field application of remediation measures deployed to remedy leakage from a natural CO₂ reservoir – a natural analogue for an engineered geological storage site. Experiences and lessons learned from the Bečej field case are studied within the MiReCOL project (Mitigation and Remediation of CO₂ Leakage). The project aims at developing a handbook of corrective measures, which can be considered in the event of significant irregularities and leakage from a CO₂ storage site. We performed a comprehensive geological characterization of the Bečej field and interpreted the most recently collected monitoring data to assess the effectiveness of the remediation measures taken in 2007. A static model was constructed that comprises the main CO₂ reservoir (Upper Cretaceous and Badennian) and several aquifers in the overburden (Pontian and Pliocene). Eight small hydrocarbon reservoirs are defined above the main CO₂ pool at depths ranging from 450 to 900 m, suggesting that the Bečej CO₂ field is a natural leaking system. The monitoring data indicate that the remediation measures were effective and have practically stopped the decline of reservoir pressure.