Time-lapse sonic logs reveal patchy CO2 saturation in-situ

Details Time-lapse sonic logs reveal patchy CO2 saturation in-situ Time-lapse sonic logs reveal patchy CO2 saturation in-situ

Jul 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3813301c&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 13, CiteID L13301

Statistics

Computation

Exploration Geophysics: Computational Methods: Seismic, Exploration Geophysics: Downhole Methods, Mathematical Geophysics: Wave Propagation (0689, 2487, 4275, 4455, 6934), Physical Properties Of Rocks: Acoustic Properties, Physical Properties Of Rocks: Wave Attenuation

Scientific paper

Based on time-lapse sonic and neutron porosity logs from the Nagaoka CO2 sequestration experiment, a P-wave velocity-saturation relation at reservoir depth is retrieved. It does not coincide with either of the end-member models of uniform and patchy saturation but falls in between even if realistic error estimates for the host rock properties are considered. Assuming a random distribution of CO2 patches it is shown that the mechanism of wave-induced flow can be evoked to explain this velocity-saturation relation. Characteristic CO2 patch size estimates range from 1 to 5 mm. Such mesoscopic heterogeneity can be responsible for attenuation and dispersion in the well logging frequency band.

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