The episodic hydrocarbon - expulsion in the effective source rock and the episodic hydrocarbon - filling in the sandstone which are two processes relatively independent and connected with each other.

• 在欠压实区的某些特定范围内,岩性油藏的形成过程具有典型的幕式特征,有效烃源岩的幕式排烃和烃源岩区内砂岩体的幕式聚烃是两个相对独立但又彼此联系的过程。