The complicated fault-block reservoirs in Dongying Depression are the secondary trap deposits which had been migrated from deep to shallow after original reserves broken down.

• 东营凹陷的复杂断块油气田是深层原生油气藏被断层破坏后，油气经二次或多次运移至浅层的断层伴生圈闭而形成的次生油气藏。