Wave Propagation in Porous Media Saturated with Two Fluids: Is it Feasible to Detect Leakage of a CO2 Storage Site Using Seismic Waves?

Marc S. Boxberg, Jean-Herve Prevost, Jeroen Tromp

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

When it comes to geological storage of CO2, monitoring is crucial to detect leakage in the caprock. In our study, we investigated the wave speeds of porous media filled with CO2 and water in order to determine reservoir changes. We focused on deep storage sites where CO2 is in a supercritical state. In case of a leak, CO2 rises and eventually starts to boil as soon as it reaches temperatures or pressures below the critical point. At this point, there are two distinct phases in the pore space. We derived the necessary equations to calculate the wave speeds for unsaturated porous media and tested the equations for a representative storage scenario. We found that there are three modes of pressure waves instead of two for the saturated case. The new mode has a very small wave speed and is highly attenuated. This mode will most likely be very hard to detect in practice and therefore it may be necessary to use time-lapse seismic migration to detect leakage.

Original languageEnglish (US)
Pages (from-to)49-63
Number of pages15
JournalTransport in Porous Media
Volume107
Issue number1
DOIs
StatePublished - Jan 1 2015

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemical Engineering(all)

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