Technique and system for deriving a time lapse low frequency model using both seismic data and a flow simulation model

摘要

The invention relates to determining a change 40 in an elastic property of a region of interest of an earth formation at a second time relative to a prior first time based on a flow simulation model 31. The change 40 is then scaled 46 in response to data 22, 24 acquired in a seismic survey. The act of scaling may comprise determining a change 46 in a velocity of the region of interest by performing a time-shift analysis 20. The change 40 in the elastic property may therefore be scaled based on the determined change in the velocity. The elastic property may comprise an acoustic impedance, a Poisson's ratio or a density.