ABSTRACT
By default, much or most of the information needed for treatment design must come from well logs. This results from the facts that it is impossible to measure design parameters such as stress or modulus on a foot-by-foot basis, added to the fact that it is impractical to gather direct data for the design variables on each well. Thus, it is critical to understand what well logs can tell us and equally as important what they cannot tell us. As a general rule, however, all well logs absolutely require calibration. This is true for the basic reservoir property logs such as porosity/resistivity, and it is particularly true for fracture design parameters. That is, we are not measuring what we need to know-we are always measuring something else and using that to infer what it is we want.
