【摘要】 惠民凹陷孔店组为末端扇沉积,中部亚相是其沉积砂体的主体。根据岩芯观察并结合地震资料,将末端扇中部亚相划分为分流河道、河道漫溢和泥滩三种沉积微相。孔店组砂岩类型主要为中细粒的长石砂岩和岩屑长石砂岩。末端扇储层中发生了多种类型的成岩作用,主要的自生矿物包括黏土矿物、碳酸盐、石英和长石等。孔店组砂岩主要受到埋藏成岩作用的影响,成岩演化阶段正处于中成岩A期。孔店组末端扇储层性质受砂体微相和成岩作用的共同控制,发育绿泥石环边衬垫和塑性组分溶蚀成岩相的分流河道砂体的物性好于发育碳酸盐胶结和压实—充填成岩相的河道漫溢砂体。更多还原

【Abstract】 Sedimentary facies of Kongdian sandstones is terminal fan.Middle zone is the main part of the tripartite terminal fan which can be divided into distributary channel,overbank and mudflat according to observation and description of cores combined with the numerous data of seismic.The sandstones type of Kongdian Formation are of fine-medium grained arkose and lithic arkose.Terminal fan sandstone has undergone many types of diagenesis.Authigenic minerals in Kongdian reservoir include clay minerals,carbonate,quartz,feldspar and so on.Based on the study of burial history,the diagenetic stage of Kongdian Formation is in A period of mesodiagenesis.Reservoir quality of terminal fan in Kongdian Formation is mainly controlled by sandbody microfacies and diagenesis.Sedimentary microfacies resolves reservoir’s original physical property,while diagenesis dominates final status of sandstone reservoir.There exists five diagenetic lithofacies in Kongdian sandstone,for example plastic composition dissolution lithofacies,chlorite gasket lithofacies,carbonate cementation lithofacies,compaction and filling lithofacies,quartz overgrowth lithofacies and so on.Diagenetic lithofacies is comprehensive reflection of diagenetic change and reservoir evolution of different microfacies sand.Distributary channel sandstone in connection with plastic composition dissolution or chlorite coating lithofacies is usually nice hydrocarbon pay bed,whereas overbank sandstone related with carbonate cementation or compaction and filling lithofacies is often low permeability layer.Terminal fan reservoir shows facies controlled feature.更多还原