Repeated or time-lapse seismic surveying for reservoir monitoring attempts to image changes in the reservoir's fluid saturations, pressure, and temperature resulting from hydrocarbon production. The difference between seismic surveys acquired between the periods of production or intervention then can be interpreted in terms of the production-related changes in reservoir properties.
Time-lapse seismic analysis (a "4D" study) has been applied to three 3-D seismic surveys acquired over the Blackfoot area, Alberta in 1993, 1995 and 1999. In this paper, only the vertical component data processed into P-wave volumes are considered. The results indicate that there are some changes in the reservoir rock properties during production.
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