知识表达语言（NFA）及其在石油测井解释专家系统中的应用

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

摘要: 石油测井解释是一项逻辑推理和数值计算交错进行的复杂过程．为了描述测井解释专家的这种知识、经验并模拟其思维方式，在扩充纯产生式规则的基础上，我们开发了知识表达语言——NFA，它把逻辑推理和数值计算综合成统一的形式．石油测井解释专家系统LIX先后在INTERDATA-85机和PE-3230机上实现，现场（胜利油田）运行近两年，解释了130余口井，符合率94%以上．LIX实质上是NFA语言的解释系统，它的研制成功，说明了NFA语言的有效性和实用性．

Abstract: 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.