OIL INJECTION AND BASIN STUDY OF FHE JURASSIC IN EASTERN JIUQUAN BASIN

The geologic features of eastern Jiuquan Basin such as the tectonic setting and evolu-tion,formative age of basin,the occurrence of source rocks are similar to those of westernJiuquan Basin.However,most faults in the eastern Jiuquan Basin do not reach the Zhong-gou Formation and Tertiary due to an earlier cease of faulting activities.Therefore no Ter-tiary secondary oil pool has been discovered in E.Jiuquan Basin,although it is favourablefor the preservation of deep Jurassic-Cretaceous oil/gas pools.Because Changsha Lingstructural belt in the basin is an"uplift within depression",the conditions for oil/gas accu-mulation are very favourable.Further to the west,it is believed that more attentionshould be paid to the occurrence of the buried-hill oil /gas pools on the dipping slope ofWen Shushan embossment.Oil injection from the Jurassic of the Jiusheng No.1 well re-minds us of the importance to re-evaluate oil/gas prospect of the Jurassic in the Corridorarea.