1965 Paper I-J

THE UNIVERSAL LOG INTERPRETATION COMPUTER PROGRAM

E. A. Breitenbach

ABSTRACT

Marathon Oil Company's Universal Log Interpretation Computer Program has been developed to afford rapid and complete analysis for exploration and production decisions.

Application of the program includes a brief pre-editing of the logs by the log analyst, digitizing of the logs, and then computation. The computed interpretation consists of selecting porous intervals and computing invaded zone resistivity, true formation resistivity, porosity, water saturation, approximate permeability, and several reconnaissance parameters at every depth point within each selected interval. Empirical techniques applicable to a given area may be employed as an integral part of the computation.

Nearly all log types may be analyzed. This includes all nonfocused resistivity devices, induction logs, most focused resistivity devices, the SP and gamma ray, the two-receiver acoustic velocity log, and most density and neutron logs. Core analysis data may be included.

This paper presents the general interpretation procedures employed by the computer program and gives examples of its use. Approximate economics are also given.