The basis of decline curve analysis is that future production continues to follow the past trend， we can use these models to estimate（）.

The basis of decline curve analysis is that future production continues to follow the past trend， we can use these models to estimate（）.
A.original gas in place
B.ultimate gas reserves
C.remaining productive life
D.formation permeability
E.skin factor
正确答案：original gas in place；ultimate gas reserves；remaining productive life；formation permeability；skin factor