Based on the principle of base level

three scales of stratigraphic cycles(short term

intermediate term and long term)could be identified through the analysis of cores

logs and seismic data.The stratigraphic cycles correspond respectively to different order base level cycles. Different types of facies successions occurred in different positions of the base level cycles. In light of the identification of multi order base level cycles

2 D high resolution sequence stratigraphic framework is established.Finally

a new proposal about favorable reservoir formations and hydrocarbon generation conditions in Qianliyuan Depression have been proposed.