【摘要】 青三段是松辽盆地主要含油层系高台子油层的重要层位,选取青三段作为目的层,根据区域地质背景、岩心观察、测井曲线以及地震资料等,对松辽盆地大情字井地区青三段的沉积微相类型、展布特征以及演化过程进行了系统的分析研究。结果显示,研究区青山口组三段发育IV型三角洲沉积体系,划分为三角洲平原、三角洲前缘以及前三角洲3个亚相,根据不同的沉积特征可进一步划分为多种微相类型,在此基础上建立了该区青三段的沉积模式。研究区目的层三角洲砂体主要沉积在北西—南东轴线上,整体自南西向北东方向展布,主要砂体类型是河口砂坝砂体,在湖浪作用改造下,局部加厚形成前缘沙坝和滨外砂坝,这是IV型三角洲沉积的主要标志。河口砂坝、前缘砂坝和滨外砂坝成为油气藏的主要储集体。更多还原

【Abstract】 The 3rd member of Qingshankou formation is an important horizon of Gaotaizi reservoir,the major oil-bearing measures in Daqingzijing area,Songliao Basin,and is taken as target strata to study sedimentary microfacies,distribution features and evolution process based on regional geologic background,core observation,logs and seismic data.The results indicate that Type IV delta deposit system had developed in the 3rd member of Qingshankou formation,and can be divided into three subfacies including delta plain,delta front and prodelta,which can be further divided into multiple microfacies based on different sedimentary characteristics.A sedimentation model has been built for the 3rd member of Qingshankou formation on this basis.The delta sand bodies in the study area mainly deposited along the northwest-southeast axis,generally distributing from southwest to northeast.The major sand body was river mouth bar,which was locally thickened and developed into front bar and barrier bar under lake wave transformation.This is the main feature of Type IV delta deposit.The river mouth bar,front bar and barrier bar constitute major reservoir bodies.更多还原