为了研究齐家地区青山口组高台子油层沉积体系展布规律，进一步探索高台子油层的油气勘探潜力，在研究区内各层序界面的精细解释基础上，利用地层切片、瞬时振幅研究等技术方法，选用了4 ms 时窗间隔的瞬时振幅地层切片，连续的地层切片展现了青山口组沉积体系连续的地震图像，清晰刻画了三角洲沉积体系向盆地方向进积到退积，高台子油层沉积基准面不断变化的过程。研究发现高台子油层储层砂体主要发育在水下分流河道、席状砂等沉积相中。大面积分布的砂体为形成砂岩透镜体、砂体尖灭、断层遮挡等岩性、断层-岩性油气藏创造了良好的储集条件。因此，研究区的高台子油层是寻找岩性、断层-岩性油气藏的有利勘探区。%This paper makes certain of the distribution of depositional systems of Qingshankou Formation in the Qijia area to explore the petroleum potence of the Gaotaizi oil layers.On the basis of the detailed explanation of the sequence interfaces and using stratal slices and the instantaneous amplitude attributes analyses technique, instantaneous amplitude stratal slices with 4 ms time windows are selected.These continuous slices provide the continuous seismic images of the delta depositional system and portray the process from progradation to retrogradation of the system and the process that the base level is continuously changing.The study finds that the reservoir sandbodies are mainly developed in the underwater distributary channels and sheet sand reservoirs.The widely spread sandbodies create favourable reservoir conditions for forming lithological reservoirs and fault-lithological reservoirs with sand lens,sandstone pinch-out and fault barriers.So the Gaotaizi oil layers are the favorable exploration area to form lithological and fault-lithological reservoirs.
展开▼
