Open-hole interpretation methods are employed to provide effective porosity data which is then used with cased-hole neutron logs to compute gas saturations in storage reservoirs. A method of using density and neutron logs to solve the problem of porosity determination in shallowly invaded gas reservoirs is developed. A system of digital magnetic tape and a computer was used to process the large amounts of log data. Line printer frequency plots and customized "Computer Logs" are graphical techniques developed to display the computer output in analyzable form. The computed logs were employed in the construction of cross-sections as well as porosity and hydrocarbon fraction maps. The computer was used to integrate these maps into total reservoir and gas storage volumes.

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