In terms of se-quence and depositional system tract,lowstand and highstand system tracts in a se-quence have various sand bodies,which are the favourable places for hydrocarbonaccumulation.

• 从层序、体系域的观点出发，层序内的低水位期和高水位期体系域发育有各类砂岩体，形成油气聚集的有利场所。