Abstract: Log formula bank is a kind of information storage based on the for-
mulation knowledge of well log interpretation, To create the bank is mainly
to collect all kinds of log interpretation models, formulas and parameters
that have been presented so far, and to provide computer choice and appli-
cation for well log interpretation.This paper further studied the log formula
bank and developed a set of microcomputer software, The log formula bank
system includes four main banks, fifty-two sub-banks, and nine main
program blocks, The practical application showed that the structure of the
log formula bank is reasonable, its function is perfect and complete, It can
store a great deal of formulation information and work as an important
auxiliary means for well log interpretation,

Key words: Log interpretation Data bank Log formula bank A