Abstract: Methods and systems are presented in this disclosure for computing lithofacies probabilities by using lithology proximity models. Log data related to a plurality of depths of a formation penetrated by a wellbore can be first gathered. Then, for each depth of the formation, distance measures of the log data relative to lithofacies responses of the lithology proximity models can be obtained. The distance measures can be mapped into probability values, and a probability that the particular formation depth belongs to a specific lithofacies can be computed by combining the probability values. The probabilities that various formation depths belong to the lithofacies from the set of lithofacies represent lithofacies earth model of the wellbore, which can be utilized for variety of operations related to the wellbore.