Abstract:

It is shown clearly by lithologic nature,clay minerals and the characters of organic geochemistry that the basement of Kelameili region was full of risesand falls during the Permian,thus limited its deposition.During the Late Per-mian,the depressions subsided and extended in the early stage;it deepened and linked up in the middle stage,and extensively accepted sediments;but in thelate stage,the basement uplifted again,leading to sedimentary absence.The development history of the region provided favourable conditons for the forma-tion of source-reservoir-cover rock assemblage.Based on the source-reservoir-cover assemblage and trap conditions,it is suggested that the northeast margin of Wuchaiwan Depression,the north andwest margins of Dajing Depression,the east and west sides of the Zhangbei Uplift may exist lithologic oil pools which is composed mainly of sandbodies.The downthrow block of Kelameili piedmont fault,the nothern small block of the Shaquhe fault may exist oil pools of block-faulted type.