P-wave velocity estimation of unconsolidated sediments containing CO2

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Carbon dioxide (CO2) can be geologically stored in unconsolidated sediments that have overlain impermeable layers that act as a cap rock. The migration of injected CO2 can be monitored by analyzing the P-wave velocities of the hosting sediments. This study suggests a new empirical bulk modulus model for the CO2 that considers the temperature and pressure effects (in the ranges of 5-35 degrees C and 4-22 MPa) of the storage site. Moreover, a P-wave velocity model of unconsolidated sediments containing CO2 is developed and verified by experimental tests. Because of the model's simple formula, the suggested model can be readily applied to general numerical analyses and seismic exploration. The effects of temperature, pressure, CO2 saturation, and effective stress on the P-wave velocities are also discussed on the basis of the proposed P-wave velocity model. The effects of temperature and pressure are more significant at shallow depths. Therefore, CO2 saturation may be incorrectly estimated at shallow depths if the temperature and pressure of the storage site are not carefully considered.
Publisher
ELSEVIER SCI LTD
Issue Date
2015-02
Language
English
Article Type
Article
Citation

INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL, v.33, pp.18 - 26

ISSN
1750-5836
DOI
10.1016/j.ijggc.2014.11.018
URI
http://hdl.handle.net/10203/196071
Appears in Collection
CE-Journal Papers(저널논문)
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