The proliferation of devices for wireline logging resulting from research in the past decade has improved remarkably the accuracy of engineering predictions on hydrocarbon reservoirs, but the masses of data generated have led to confusion in geologic applications. The five types of logging, all of which have one or more subtypes, are electrical, thermal, acoustical, mechanical, and nuclear. To be useful in stratigraphic interpretations, results of all logging should be in a format suitable for supplying readily data on the geometry of the major beds, lithology of individual beds, and distinctive geophysical characteristics of beds for long distance correlations. This will involve transforming old log data into a new reproducible form, possibly magnetic tape.

You do not currently have access to this article.