Abstract: The result of structural recover shows that Yanqi basin is extensional rift-subsidence basin during middle and early Jurassic, it is characterized from the tectonic evolution by firsly compressed and then extend. The evolution feature determined the types and distribution of sediment systems in Jurassic basin. Synthetical studies of depositional system, depositional models and petroleum geological conditions showed that the lower and middle Jurassic in this basin is a suite of coal measures strata, and they have favorable conditions to the formation of lithologic reservoir. Especially,widely developed fan delta system in north abrupt slope and braided delta in south gentle slope and discovery of Zhongmachang and Baolang coarse grain channel system provided a bright prospect for lithologic reservoir exploration. This paper summarized several possible distribution models of lithologic reservoir in this area, it will provide an important reference for oil and gas exploration.

Key words: Yanqi basin, Jurassic, coal bearing beds, lithologic reservoir