Diffusivity coefficient shows fluid ability flowing through porous media respect to wellbore storage coefficient. It can be used to identify reservoir characterizations which its value can be obtained from welltest analysis. A new mathematical correlation between productivity index (PI) and Diffusivity coefficient has been obtained which applying it and PI, value of diffusivity constant and consequently permeability of area around wells and other reservoir zones can be achieved without doing welltest. It is very useful especially when we haven’t enough welltest data. We found a unique equation for the Asmari reservoir of Iranian fields using available data for three fields and extending the result for the whole reservoir. Finally we applied geostatistical method to represent distribution pattern of K and PI for different parts of reservoirs to find different sectors of reservoir with higher or lower PI and K to detect the best locations for drilling new wells with higher PI, which is another dominant point of this paper.


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