Analysis of geopressured gas reservoirs often times is particularly difficult. The effects of pore volume compressibility as well as the uncertain presence of water influx should usually be included in the calculation procedures. The solution plot method is a straight forward procedure which negates the need for estimating these two troublesome reservoir parameters.

Computer simulation studies have shown variable pore volume compressibility effects exhibited by under-stressed, abnormally pressured gas reservoirs are based on grain expansion as well as pore collapse values. Normally compacted geopressured, gas reservoirs will display uniform pore volume compressibility effects.

The solution plot method permits the simultaneous estimation of the original gas in place, pore volume compressibility values as well as a qualitative estimate of the affect of water influx.

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