HR: 0800h
AN: MR31C-0520    [Abstracts]
TI: Laboratory measurements and modeling of seismic attenuation in saturated limestones
AU: * Adam, L
EM: mila.adam@gmail.com
AF: Colorado School of Mines, 1500 Illinois St. CSM Dept. of Geophysics, Golden, CO 80401, United States
AU: Batzle, M L
EM: mbatzle@mines.edu
AF: Colorado School of Mines, 1500 Illinois St. CSM Dept. of Geophysics, Golden, CO 80401, United States
AB: There is growing interest in using seismic attenuation for reservoir characterization. We measured limestone samples in the laboratory to analyze attenuation and elastic moduli as a function of frequency from 3~Hz to ultrasonic. We observe that there is a positive correlation between bulk modulus dispersion and permeability. We also measure different modes of attenuation and find that the attenuation in our fully-saturated samples is dominated by bulk compressibility losses rather than shear or viscous losses. We observe that attenuation significantly increases when brine replaces a light hydrocarbon. In addition, the shear modulus shows sensitivity to brine saturation. These results suggest that changes in seismic wave attenuation can be used as an attribute in surface seismic exploration. This might be of particular utility in the areas of time-lapse monitoring of reservoirs for either enhance production or CO₂ sequestration. Finally, we use the Kramers-Kronig relations to model attenuation from the measured moduli as a function of frequency.
DE: 0999 General or miscellaneous
DE: 3630 Experimental mineralogy and petrology
DE: 3909 Elasticity and anelasticity
DE: 5102 Acoustic properties
DE: 5144 Wave attenuation
SC: Mineral and Rock Physics [MR]
MN: 2007 Fall Meeting