On the Effect of CO 2 on Seismic and Ultrasonic Properties: A Novel Shale Experiment

Stian Rørheim, Mohammad Hossain Bhuiyan, Andreas Bauer and Pierre Rolf Cerasi
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Stian Rørheim: Department of Geoscience and Petroleum, Norwegian University of Science and Technology (NTNU), NO-7034 Trondheim, Norway
Mohammad Hossain Bhuiyan: SINTEF Industry, NO-7465 Trondheim, Norway
Andreas Bauer: Aker BP, NO-7011 Trondheim, Norway
Pierre Rolf Cerasi: SINTEF Industry, NO-7465 Trondheim, Norway

Energies, 2021, vol. 14, issue 16, 1-20

Abstract: Carbon capture and storage (CCS) by geological sequestration comprises a permeable formation (reservoir) for CO 2 storage topped by an impermeable formation (caprock). Time-lapse (4D) seismic is used to map CO 2 movement in the subsurface: CO 2 migration into the caprock might change its properties and thus impact its integrity. Simultaneous forced-oscillation and pulse-transmission measurements are combined to quantify Young’s modulus and Poisson’s ratio as well as P- and S-wave velocity changes in the absence and in the presence of CO 2 at constant seismic and ultrasonic frequencies. This combination is the laboratory proxy to 4D seismic because rock properties are monitored over time. It also improves the understanding of frequency-dependent (dispersive) properties needed for comparing in-situ and laboratory measurements. To verify our method, Draupne Shale is monitored during three consecutive fluid exposure phases. This shale appears to be resilient to CO 2 exposure as its integrity is neither compromised by notable Young’s modulus and Poisson’s ratio nor P- and S-wave velocity changes. No significant changes in Young’s modulus and Poisson’s ratio seismic dispersion are observed. This absence of notable changes in rock properties is attributed to Draupne being a calcite-poor shale resilient to acidic CO 2 -bearing brine that may be a suitable candidate for CCS.

Keywords: CO 2 storage; rock physics; anisotropy; dynamic acoustic properties (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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