辽河西部凹陷沙三段岩性油气藏主控因素研究

辽河坳陷西部凹陷作为我国东部典型的富油气凹陷，勘探程度较高。深部的地层岩性油气藏是西部凹陷下一步油气勘探的主要目标，其中西部凹陷沙三段是非常有利的岩性油气藏发育层位。研究认为，西部凹陷岩性油气藏的分布主要受有效烃源岩分布、浊积砂体展布和油气运移3 个因素的控制。在成藏因素综合分析的基础上，预测了西部凹陷中深部沙三段岩性油气藏的有利分布区，其最有利的勘探区域为清水洼陷及周边地区。

Controlling factors of lithologic reservoirs of Sha 3 member in West Sag of Liaohe Depression

West Sag of Liaohe Depression is a representative hydrocarbon-rich sag in eastern China, with a high degree of exploration. The deep stratigraphic-lithologic reservoirs are the main exploration targets in the further exploration of West Sag, and the lithologic reservoirs are considered to mainly distribute in the third member of Shahejie Formation. It is believed that lithologic reservoirs are mainly controlled by three factors, including effective source rocks, turbidite sand body distribution and hydrocarbon migration. Based on the analysis of petroleum accumulation factors, the favorable zones of the lithologic reservoirs of the third member of Shahejie Formation are predicted, and the most favorable zone is in Qingshui sub-sag of West Sag and the surrounding areas.