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Abstract
Journal of Petroleum Geology, vol.
20(
2), April 1997, pp. 185-
204©Copyright 1997. Scientific Press, U.K. All rights reserved.
FUZZY MODELLING
AND THE PREDICTION OF POROSITY AND PERMEABILITY FROM THE COMPOSITIONAL AND TEXTURAL
ATTRIBUTES OF SANDSTONE
J. H. Fang* and H. C.
Chen**
A new method is presented here for predicting porosity and
permeability from the compositional and textural characteristics of sandstones. The method
employs fuzzy modelling which is a linguistic paradigm based on fuzzy logic, rooted in the
theory of fuzzy sets. The essentials of fuzzy modelling are explained using an example in
which porosity and permeability values of a sandstone are predicted from five
compositional and textural attributes. Fuzzy modelling can be accomplished in five steps:
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