Incorporating of constrains in data-misfit domain is tested in this part of study. The inverted density model has resolved different lithology layers, and successfully delineated gas-bearing sand reservoir of the Blackfoot. The additional information incorporated into the weighted matrices used by inverse algorithm has enhanced the interpretation of inverted density log significantly; in particular, the sand base-line as well as separation of sand and carbonate regions. Joint-inversion of Vp and Vs logs to predict density log has shown some improvements of final shape of density log.
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