东营凹陷林樊家-尚店地区馆四段沉积相研究

Study on Sedimentary Facies in the Guan-4 Member in Shangdian District-Dongying Depression Linfanjia

馆陶组馆四段是林樊家-尚店地区的主力层段,然而油气在平面上分布变化大,在纵向上砂体与油气分布关系不明确,因此对该区馆四段的沉积特征进行研究具有重要的勘探生产意义。利用岩心、测井、地震等基础资料,可识别出馆四段的4个短期基准面旋回,对馆四段进行小层划分,进而细化馆四段沉积相,划分出河道、心滩、边滩、决口扇、废弃河道等5种沉积微相。结果表明,馆四段自下而上由辫状河沉积逐渐转变为曲流河沉积。

Guan-4 Member of Guantao Group is the main layer in Linfanjia-Shangdian district.But,the oil gas distribution has a largely change on a plane.The distribution of sand body and oil gas is not defined in longitudinal direction,therefore,the study on sedimentary characteristics of Guan-4 Member has a significant exploration and production meanings.Four short-term base level cycle was identified in the Guan-5 Member by using core,well logging,earthquake and other fundamental data.Single layer was classified in the Guan-4 Member,then the sedimentary characteristics are refined in the Guan-4 Member.Finally,five sedimentary microfacies were classified,including river way,diara,marginal bank,flood fan and abandoned channel.Studies show that the Guan-4 Member was transformed to meander river sedimentary from braided river deposit from bottom to top.