东营凹陷油气成藏期分析

综合盆地构造演化和圈闭发育史、烃源岩主要生、排烃史、油藏饱和压力、成岩矿物流体包裹体等资料,对济阳坳陷东营凹陷的油气藏形成期进行了分析。研究区成藏期主要分为两期,即渐新世末和中新世末至上新世,大规模油气聚集发生于中新世末至上新世,尤以上新世明化镇组沉积中晚期为主。不同层系及不同构造单元中的油气藏,主要形成期存在差异,烃源层系中的岩性油气藏形成时间较早;由下向上,由凹陷中心向边缘,油气藏的主要形成期有逐渐变晚的趋势。

ANALYSIS OF PETROLEUM ACCUMULATION PHASE IN DONGYING SAG

Based on composite data of trap formation and evolution, hydrocarbon-generated and hydrocarbon-expulsed process, reservoir saturated pressure and fluid inclusion of diagenetic minerals,the accumulation phase of oil and gas reservoirs in Dongying sag have been divided into two phases,i.e. the late Oliocene phase and the late Miocene to Pliocene phase.Large oil and gas pools were accumulated in late Miocene to Pliocene,especially in the middle-late period deposited in Pilocene Minghuazhen Fm.The main petroleum accumulation phases varies in the oil and gas reservoirs in different stratigraphic horizons and different structural units.In general, it is relatively early in the lithologic pool enclosed in source rocks. There is a tendency for the main accumulation phase of oil and gas reservoirs to become late ordered stratigraphically from the bottom to the top and from the center area to the margin of Dongying sag.