The analyses of reservoiring conditions

and burial and thermal history of the three major depressions in Erlian basin

combined with the study on the characteristics and the quantitative analysis of homogenization temperature of its diagenetic fluid inclusions

lead to the conclusion that the lithologic pools in the basin feature in episodic hydrocarbon charging.A comparison with the reservoiring periods of the structural pools at the same horizon in this depression suggests that the lithologic oil pools were formed relatively early.The early formation of lithologic traps was favorable for the early capture of hydrocarbons

and the multistage formation of the lithologic traps and episodic multistage charging of hydrocarbons was conducive for the formation of large-scale lithologic pools.