Abstract:

In order to investigate the distribution of awaiting proved resources of Yanchang Formation of Triassic in Ordos Basin and explore effective exploration regions of resources replace for keeping up a steady increase in the proven petroleum geological reserves，the article analyse the characteristics of resources and proven petroleum geological reserves in five depositional systems of Yanchang Formation. The results indicate that the middle and lower associations are the main replace regions, in which the Chang 6, Chang 8 oil layers in the middle part of the basin and the Chang 8 oil layer in the northwest and southwest depositional systems are actual exploration areas keeping production and adding reserves. The Chang 8 oil layer in the northeast depositional systems and the Chang 9, Chang 10 oil layers in the whole basin are the main replaced regions to keep steadily ascending in the following five to ten years.

Key words: resources, awaiting proved resources, exploration replace area, Yanchang Formation of Triassic, Ordos Basin