Separation of pressure and saturation changes from 4D Amplitude information is becoming more common. Current practice requires elastic properties to be estimated independently from amplitude information (AVO) with few constraints, and pressure and saturation to be estimated from these elastic parameters. We show that inherent uncertainties in the inversion for elastic parameters from 4D AVO data can be very poorly determined, potentially leading to the inability to detect changes in pressure and saturation. Using a calibrated poro-elastic model, we show that pressure changes produce elastic parameters that are poorly determined in the 4D AVO inversion, highlighting the need for using additional constraints in AVO inversion such as the time-shift.


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