Knowledge Representation Language NFA and Its Application in Expert System for Oil Log Interpretation

In order to describe oil log interpretation experts' knowledge and experiencesand simulate their modes of thinking we developed a new knowledge representationlanguage NFA,which is an extension of pure production rules and integrates thenumerial calculation with the logical reasoning in the unified form.The expert system LIX for oil log interpretation,developed by us,is in essencean interpreter of NFA language.Its rate of coincidence in interpreting oil-well datais more than 94% as compared to human experts.