The exact role of the computer in the fields of geology and well log analysis has been the subject of some controversy and a lot of confusion. The computer, when properly implemented and programmed, can assume a different role--that of an analysis partner. In this approach, the user must be able to communicate both freely and naturally with the computer--and vice versa; i.e., the system must be truly interactive. Another key element is graphics, since the geologist's world is usually described using maps, graphs, diagrams, charts, logs, etc. An interactive graphics system has been used to analyze several formations in various parts of the world. The main portion of this paper uses some of these analyses in a "case study" approach to help describe the techniques.

Most of the analyses involve interactive log analysis. The logs were first subjected to a conventional analysis using the computer to help speed up the mathematical computations. The computer also generated all data listings, graphs, plotbacks, and crossplots during this phase.

The next phase was an in-depth detailed analysis to discover more about the key characteristics of the formation. Most of these algorithms are beyond the capability of a handheld calculator, but the interactive nature of the system makes the techniques very easy to use. In addition, several separate models for each well were generated and the results compared statistically in a short span of time.

Results from several formations, including the Mancos "B" in western Colorado, are presented in detail to illustrate the advantage of the use of interactive graphics software. In each formation, an unusual geologic problem was investigated and solved. All formations were determined to be hydrocarbon bearing, and the various zones were identified and analyzed. (The Mancos B is especially interesting in that it is recognized as a tight formation that has resisted some of the more conventional analytic approaches.)

The degree of success achieved in solving these problems indicates that the use of an interactive computer system in this manner is not only valid, but merits more widespread application.

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