1. n. [Reservoir Characterization]
A computer system that uses a rule-based algorithm to provide expertise on a given subject. Many computer programs have been written for use in the oil field using rule-based approaches to provide expert systems. The rules are taken from an expert working in the field and are written in a way that attempts to reproduce the knowledge and approaches used by that expert to solve a range of actual problems. Most such programs are limited to specific disciplines such as dipmeter interpretation, electrofacies determination, reservoir characterization, blowout prevention or drilling fluid selection. Sometimes expert systems are written in computer languages such as LISP that easily handles rules, but once fully tested, expert systems are usually translated to BASIC, C or FORTRAN to be compiled into efficient applications or programs.