The CORIBAND* computer program has been used to solve interpretation problems in reservoirs of complex lithology. This paper reviews the general CORIBAND technique and discusses field examples of practical interest in wells in the United States and Canada. Log-data crossplots used to determine CORIBAND) options and select parameters are shown. These include the Z-PLOT* which allows simultaneous interpretation of any combination of three logging parameters. The choices of "interpretation models" and shale parameters are discussed. In each example, the CORIBAND results are compared with the available geological data and production history.

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