关键词: 含油气系统, 烃源岩, 成藏条件, 油气运移与聚集, 东营凹陷

Abstract: Dongying Depression is a typical petroliferous lacustric basin in Bohai Bay Basin and has entered a high-exploration stage. There are two hydrocarbon source rocks and two petroleum systems including Es₃-Es₂/Es₃(!) and Es₄-Es₄/Es₂(!) in the Tertiary of Dongying Depression. The vertical hydrocarbon migration is intensively active in this area because of faulting. The two petroleum systems in Dongying Depression share some geological elements for reservoir formation and have the characteristics of some complex petroleum system. Dongying Depression has multiple centers of hydrocarbon generation and expulsion. The petroleum generation and accumulation systems in every sub-depression are independent and can be divided into four sub-petroleum systems according to the hydrocarbon generation centers and distance of petroleum migration. Based on the division of petroleum system, eight hydrocarbon migration and accumulation units are divided in Dongying Depression. The petroliferous prospects of those sub-petroleum systems and hydrocarbon accumulation units have been evaluated.

Key words: petroleum system, hydrocarbon source rock, reservoir formation condition, hydrocarbon migration and accumulation, Dongying Depression