Expert systems are artificial intelligence tools that store and implement expert opinions and methods of analysis. The goal of this project was to test and prove the ability of expert systems to enhance the exploration process and to allow the rapid, simultaneous evaluation of numerous prospects. The project was designed to create two case-study fuzzy expert exploration (FEE) tools, one for the Lower Brushy Canyon formation of the New Mexico portion of the Delaware Basin, and the second for the Siluro-Devonian carbonates of southeast New Mexico.