东营凹陷岩性油藏成藏期次与成藏过程

东营凹陷岩性油藏分布规律复杂,成藏时期存在差异,从而影响了对岩性油藏形成和分布规律的深入认识.综合运用东营凹陷的构造演化史及岩性圈闭形成史、烃源岩主要生排烃史和流体包裹体均一温度等资料,对东营凹陷岩性油藏的成藏期次、成藏过程、成藏阶段和不同期次岩性油藏的平面分布规律进行了系统研究.研究结果表明:东营凹陷岩性油藏的成藏期次主要有两期,即古近纪东营组沉积末期和新近纪馆陶组-明化镇组沉积时期,且以馆陶组-明化镇组沉积时期为主要成藏期;不同成藏期次的岩性油藏具有一定的分布规律:第一期分布于生油洼陷,为岩性油藏,其包裹体均一温度分布较宽,油气充注持续时间长,具有两期充注的特点;第二期分布于断裂带和斜坡带,为构造-岩性油藏和岩性油藏,其包裹体均一温度分布较窄,油气成藏时间较晚,主要为馆陶组-明化镇组沉积时期充注;东营凹陷岩性油藏的形成具有明显的阶段性,可以划分为成藏准备、成藏和保存3个阶段.

Accumulation Time and Accumulation Process of Lithological Reservoirs in Dongying Depression

The distribution discipline of lithological reservoirs in Dongying Depression is complex.The different accumulation time also affects the deep understanding of the formation and distribution discipline of lithological reservoirs.The article studies the accumulation time,accumulation stage and the plane distribution discipline in different accumulation times of lithological reservoirs in Dongying Depression by using tectonic development history,lithological trap formation history,key generation and expelling time of source rock and homogenization temperature of fluid inclusion.The results show that the accumulation time of lithological reservoirs in Dongying Depression can be classified into two key times,i.e.late Dongying period and Guantao to Minghuazhen period,the latter is the major period for the formation of the reservoirs in the depression.Some distribution disciplines are found for the reservoirs in different accumulation times.The lithological reservoirs in the oil-generated depression have a broad distribution of homegnization temperature of fluid inclusions,and the injection of oil lasted for long time.Hydrocarbon accumulated in the two periods.While the opposite is found in the tectonic-lithological reservoirs and lithological reservoirs in fault zone and slope zone,whose accumulation time is late.Guantao-Minghuazhen group sedimentary time injection are mainly reflected. With obvious stage characteristics,the formation of lithological reservoirs in Dongying Depression can be classified into three stages combined with diagenetic evolution history and accmulation mechanism: accumulation preparation stage,accumulation stage and maintain stage.