Written by: Ehsan Naeini and Russell Exley
De-risking via objective quantitative interpretation (QI) is an essential part of successful hydrocarbon exploration and appraisal. Given suitable subsurface scenarios QI using AVO inversion can be used to identify lithologies, indicate pore fluid fill and determine net rock volume. However, the detail that can be extracted from a conventional AVO inversion workflow is limited by the averaging effects of not taking into account facies variations and adopting a simplified, rigid low frequency model input to supplement band limited seismic input. An alternative emerging technology, joint-impedance facies inversion, is presented here and provides rock physics models for each individual facies, whilst simultaneously updating the low frequency model; thereby removing one of the main sources of error in conventional AVO inversion routines.
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