Static reservoir pressure help

[bayan]

Could any one to explain me the reasons that will cause sharply decline in reservoir pressure .the reservoir has gas cap and aquifer.
thank you in advance

[brhm]

check
1)whether there is any faults making connected volume smaller than you thought
2) is it possible that the aquifer or gas somehow escaping?
3) if you say sharply, I dont think it will be due to the weak aquifer but check if the connection and aquifer strength is good too.
hope one of them helps....

[bayan]

Thank you so much for your reply.
it is seem the aquifer strength is weak.the decline was smoothly and logic in the begning for some years but now the decline not logic its sharp.
any way thank you so much.