EXPERT-SYSTEMS FOR AUTOMATED CORRELATION AND INTERPRETATION OF WIRELINE LOGS

CORRELATOR is an interactive computer program for lithostratigraphic c orrelation of wireline logs able to store correlations in a data base with a consistency, accuracy, speed, and resolution that are difficult to obtain manually. The automatic determination of correlations is ba sed on the maximization of a weighted correlation coefficient using tw o wireline logs per well. CORRELATOR has an expert system to scan and flag incongruous correlations in the darn base. The user has the optio n to accept or disregard the advice offered by the system. The expert system represents knowledge through production rules. The inference sy stem is goal-driven and uses backward chaining to scan through the rul es. Work in progress is used to illustrate the potential that a second expert system with a similar architecture for interpreting dip diagra ms could have to identify episodes-as those of interest in sequence st ratigraphy and fault detection-and annotate them in the stratigraphic column. Several examples illustrate the presentation.