Enhanced oil recovery monitoring using P-wave attenuation
نویسنده
چکیده
Crosswell attenuation tomography is used to image reservoir zones that were flooded by carbon dioxide. The swept zones contain mixtures of oil, water and carbon dioxide. Monitoring the saturation of these fluids is an important part of a enhanced oil recovery process. We estimate the changes in P-wave attenuation caused by the injection process. Laboratory data on flooded cores are analyzed in support of the field data interpretation. We use a broad band amplitude spectra method and the centroid frequency shift method to estimate the attenuation. The methods are applied to seismic waveforms recorded before and after the injection.
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