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Improvement of Calculation Method of Gas Accumulation Rate in Gas Reservoir——41 Large and Medium Gas Fields in China as Examples

FU Guang,GENG Qi College of Earth Sciences,Daqing Petroleum Institute,Daqing,Heilongjiang 163318,China  
In order to study gas accumulation capability and rate accurately,on the basis of previous research on the calculation method of gas accumulation rate and taking into account the gas diffusion amount after the formation of gas reservoir,the calculation method of gas accumulation rate in gas reservoir was improved.The authors selected 41 large and medium gas fields in China as examples and calculated their gas accumulation rates by use of calculation method of gas accumulation rate in gas reservoir before and after improvement.It was considered that gas accumulation rates of these gas fields calcula-ted respectively by original and improved methods are quite different.The improved is 1.01-3.05 times of the original,and 1.29 times on average.It shows that gas accumulation rates calculated by improved calculation method are much closer to the true values than original methods,and they reflect better the underground actual situation.
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