The possible use of attenuation measurements for time-lapse seismic monitoring of an EOR steam flood project in Saskatchewan, Canada is investigated. A VSP survey was used to calculate Q. These values were input to a synthetic seismogram attenuation modeling program that showed there should be an observable increase in attenuation after steam injection. Two seismic lines shot at the same location nine years apart were analyzed to see if attenuation anomalies were apparent. The results indicate a strong anomaly on the recent seismic line that is consistent with the location of steam injection. A weaker anomaly on the older line is consistent with the amount of steam injected at that time. Theoretical and laboratory analyses of compressional velocity as a function of changes in temperature, pressure, fluid type and fluid phase suggest there should be a measurable effect on compressional wave amplitude, isochron, and frequency response.
We describe a seismic field experiment and subsequent data analysis designed to test the performance of common sources and receivers at low frequencies. Both dynamite and vibroseis sources were tested. Receivers tested included Vectorseis (MEMs) and both 4.5 Hz and 10 Hz geophones.Dynamite produced the strongest lowfrequency signal but vibroseis was able to operate effectively down to around 2 Hz using low-dwell sweeps. Both geophones recovered low frequency signal down to 1-2 Hz after correction for their intrinsic response. Vectorseis produced a strong response to very low frequencies but increasing noise becomes a progressive problem.
A new high resolution processing stream comprising multiple passes of Gabor deconvolution is compared to an industry standard approach for high frequency reconstruction. Comparisons are made on both synthetic and real data sets, and algorithm efficacy is assessed based on well-tie analyses and also on interpreter feedback concerning the overall image character.
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