A great amount of massive source rocks developed in Members 3 and 4 of the Shahejie Formation (S3 and S4) in eastern Dongying depression provide sufficient hydrocarbon resources for lithologic traps.

• 东营凹陷东部在沙三、沙四段沉积时期发育了大量厚层烃源岩，为圈闭成藏提供了充足的油气资源。