ABSTRACT

A 3900 acre oil sand mining operation in northeastern Alberta is being conducted by Great Canadian Oil Sands, Ltd. The sands contain up to 18% by weight of low gravity oil or tar and are lenticular and interbedded with barren shale and silt strata. In order to determine in place oil content and other ore body characteristics an extensive coring and well logging program was conducted during the winters of 1963–64 and 1964–65. Using a comprehensive well log analysis computer program, core analysis data and a geological data processing system, average grade, in place oil reserves and other characteristics of the mining lease were determined. Of all logging devices tested the formation density-laterolog 3 combination provided the best borehole measurements of porosity and water saturation. Numerous comparisons of core vs. Log analysis results indicate that accurate oil content can be ascertained in the oil sands using conventional log analysis methods. Core and log information were combined to produce continuous oil saturation, water saturation and bulk density profiles for each test hole. Stratigraphic correlations and oil grade cutoff tops and bases were also included for each test hole. Based on this information numerous maps and cross sections defining the oil sand-ore body were produced using the computer-plotter combination.

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