Abstract
Well logging denotes any operation wherein some characteristic data of the formation penetrated by a borehole are recorded in terms of depth. Various types of measuring devices can be lowered on cables in the borehole for the sole purpose of measuring (logging) both borehole and in situ formation properties. These logging tools, or logging sondes, contain sensors that measure the desired downhole properties, whether thermal, magnetic, electric, radioactive, or acoustic. Several geophysical well logs can be used to evaluate oil-shale deposits, as far as lithology variations, thickness, and oil yield are concerned. This chapter discusses properly selected logging programs and associated interpretation methods and reviews geophysical well logs applicable for oil shale evaluation. Geophysical well-logging techniques provide indirect oil yield estimates that result in a faster, economical, and more attractive evaluation of oil-shale deposits. The oil-yield estimates from geophysical well logging measurements are based on several basic important assumptions (1) correlation between physical rock property and oil yield, (2) mineral composition in oil shales, and (3) porosity development in oil shales.
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