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Present-day technology is supplying digitized wireline log records, either at the well site or at computing centers. Most of these records are used to calculate reservoir parameters of subsurface formations. Although porosity estimates have been vastly improved by these procedures, the techniques developed have dubious application in lithologic evaluation. Digitized logs do provide an excellent base for improved display of log information. Variable area, variable density, mixed mode, and filtered-curve displays accentuate similarities in deposition patterns between wells. Logs in wells with hole-deviation problems or steeply dipping beds may be normalized to match nearby wells. The human eye can be encouraged to act as an analogue computer by such changes in mode of prese tation. Techniques developed to estimate formation fluid pressures from well-log data have been used to control drilling practices and may have a significant contribution in detecting patterns of fluid migration within deposition basins.
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