Part of the Gullfaks field has been repeatedly surveyed seismically so that surface seismic data are available as three partial stacks for 1985, 1996, 1999 and 2003, respectively. Time-lapse, or 4-D, simultaneous amplitude variations with offset (AVO) inversion was performed in order to directly estimate acoustic impedance and Poisson's ratio for the baseline survey and to estimate change for each of the monitor surveys. The rock physics analysis of well log data and rock physics modeling for the field were applied for the interpretation of the time lapse inversion results....

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