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Controlled source electromagnetic modeling and sensitivity analysis for monitoring subsurface CO2 storage

Sammendrag

The electrical resistivity of reservoir rocks, according to Archie’s law, is very sensitive to changes in fluid saturation. Consequently, time-lapse resistivity anomalies due to CO2 storage within subsurface reservoirs can be detected by controlled source electromagnetic (CSEM) repeat surveying. Three-dimensional (3D) finite difference time domain (FDTD) forward modeling [1], based on subsurface resistivity structures, demonstrates the possibility of CSEM surveying to monitor movement of subsurface CO2 storage. Preliminary studies in this direction (see [2] and [3]) confirm the feasibility of CSEM as a monitoring tool. In [2] a study based on 2D finite element method is carried out for general case of reservoir monitoring. The focus in [3] has been the detectability of CO2 by CSEM surveying for the specific case of Utsira formation. CSEM sensitivity study assuming realistic CO2 storage within a subsurface reservoir in a shallow water (100 m) geological setting is presented in this work. Similar studies assuming idealized CO2 storage at deep water (700 m) setting is under review [4] The present study focuses on:
• Monitoring time-lapse CSEM anomalies with respect to variations in geometry and/or saturation of CO2 storage
• Evaluation of the effects of reservoir depths and lithology on time lapse anomalies
• Detection of potential CO2 leakage from the main storage
Air-wave strongly influences the subsurface CSEM responses in shallow water settings [5] Airwave effects in the modeled data are investigated for a realistic 4D CSEM analysis. The

Kategori

Poster

Oppdragsgiver

  • Research Council of Norway (RCN) / 193816

Språk

Engelsk

Forfatter(e)

Institusjon(er)

  • Ukjent
  • Norges teknisk-naturvitenskapelige universitet
  • SINTEF Industri / Anvendt geovitenskap

Presentert på

10th International Conference on Greenhouse Gas Control

Dato

19.09.2010 - 23.09.2010

År

2010

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