In this paper ,the four effective methods of identifying deep
gas zone are introduced and the program GASD of processing the
log data of deep gas zone is given. The deep gas zone of Dongpu
depression is of low porosity and low permeability. By fully using
the log data and comprehensive studies of log response of deep
gas zone , the following methods , such as the ratio of space
modulus difference ,the difference and ratio of three porosities ,the
ratio of four porosities and the ratio of fluid acoustic impedance
are given. The practical application of these methods show that
they can indicate the existence of natural gas in tight and deep
formations.
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