Abstract: Results of pressure build-up analysis for the carboniferous reservoir in District No. 1 are briefly described in this paper. Its reliability is confirmed through quality checking and comparison with the reservoir geology,well production as well as reservoir production perform, nee. The characteristics and its forming mechanism aie discussed emphatically based on proceeding studies . It is concluded that the Carboniferous reservoir rock in District No. 1 is an nontypi- cai , fracture—matrix dual porosity type. Finally specifications related to improving water injection pattern are proposed based on the principle that reservoir production scheme should be consistent with reservoir geology.

Key words: dual porosity reservoir, pseudo-steady curves, pressure build-up, for modern well test analysis technique