Abstract: According to four resource evaluation results in Jiyang Depression, it is regarded that better understanding of resource potential may be gained in pace with the increasing cognition at exploration. Growth in proved reserves depends on resource base. The exploration degree in the Depression is relatively high, but remaining resource potential is great. Analysis shows that subtle reservoir such as lithologic reservoir, stratigraphic reservoir and buried-hill reservoir dominates the proved resource composition. The Depression has entered into the period of subtle reservoir exploration. Pre-Paleogene and deep layer of Paleogene with burial depth exceeding 3500m, and the southern ramp in Dongying sag, northern steep slope in Chezhen sag, Linnan sag in Huimin Depression with large resources potentials but low exploration degree will be important strata and regions to make new break and achieve sustained reserve growth

Key words: Jiyang Depression, resource potentials, degree of exploration, subtle oil reservoir, reserves growth