东营凹陷古近系岩性地层油气藏层序地层学特征

运用层序地层学理论分析了东营凹陷古近系岩性地层油气藏的形成诸要素及分布规律。研究认为,层序对岩性地层油气藏生、储、盖、运移和聚集等成藏诸要素具有重要的控制作用。岩性地层油气藏主要分布于坡折带之下、不整合面和湖泛面附近;体系域和沉积基准面旋回对油藏类型具有重要的控制作用,湖侵体系域发育以地层为主的油气藏,低水位体系域、高水位体系域发育以岩性为主的油气藏;不同级别层序界面附近砂体成藏率不同。

Sequence stratigraphic characteristics of the Paleocene lithologic and stratigraphic reservoirs in the Dongying Depression

In this paper,sequence stratigraphic theories are used to analyze the hydrocarbon pooling factors and distribution pattern of the Paleocene lithologic and stratigraphic reservoirs in the Dongying Depression.According to the study,the sequence stratigraphy has a major control on the hydrocarbon pooling factors of the lithologic and stratigraphic reservoirs,such as hydrocarbon generation,preservation,sealing,migration and accumulation.Lithologic and stratigraphic reservoirs are mainly distributed below slope break,near unconformity surface or near flooding surface.System tracts and sedimentary base level cycle control the types of reservoirs: stratigraphic re-servoirs mainly occur in the lake transgression system tract,while lithologic reservoirs are mainly found in low system tract and high system tract.The pool-forming efficiencies are different for sandbodies on different orders of sequence boundaries.