Most open-hole logs can be used for fracture detection. Each petrophysical measurement responds to fractures in a different way, and much literature exists describing the effects of fractures on tool responses. Most fracture detection programs use either one or two logs or many fracture indicators, but make no attempt to tie them together. Since fracture systems appear to provide nearly all the permeability for production in the Monterey Formation, fracture analysis is essential throughout the well. A program has been written to give a continuous output of fracture probability using all fracture information available from well logs, as well as from mud logs and drilling data. It is easily adaptable to local conditions (in particular, the Monterey Formation) through log an lyst input. The program computes a composite fracture probability using all available fracture indicators. Each indicator will give an individual probability of fracturing. These probabilities are then weighted and combined to give a composite fracture probability.

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