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通过岩心观察和描述,结合地质背景研究,在松辽盆地三肇凹陷白垩系姚家组一段识别出震积岩。震积岩主要识别标志有液化砂岩脉、地层破裂构造、震裂缝和微断层、层内褶皱、泄水脉和层理变形、自碎角砾构造及不协调岩块等,并通过对震积标志特征和成因机制的研究,建立了震积岩垂向序列。震积岩的发现对三肇凹陷姚家组油气勘探的意义在于:地震活动可以降低储层孔渗参数、增加油气运移通道;地震引起的断裂可以使三角洲前缘水下分流河道和河口坝砂岩体形成良好的岩性圈闭;地震引起的三角洲前缘滑塌可以使浊积岩发育,为形成岩性油藏创造条件。
Through core observation and description, combined with the study of geological background, seismites are identified in the first member of the Yaojia Formation of the Cretaceous in the Sanzhao Sag, Songliao Basin. Seismite sediments are mainly identified by liquefied sandstone veins, formation rupture, seismic fractures and micro-faults, intra-layer folds, drainage veins and bedding deformations, self-broken breccia structures and uncoordinated rock masses, Mark characteristics and genetic mechanism of research, established a vertical sequence of seismites. The significance of seismites to the exploration of the Yaoji Formation in the Sanzhao depression lies in the fact that the seismic activity can reduce the porosity and permeability parameters of the reservoir and increase the migration channels for oil and gas. The fracture caused by the earthquake can make the delta front distributary channel and estuary dam The sandstone body forms a good lithologic trap. The earthquake-induced delta front slip can develop turbidite and create conditions for the formation of lithologic reservoirs.