【摘要】 以区域构造背景为基础,通过对28口井近1000 m岩心的详细观察,在辽河西部凹陷南段古近系沙河街组三段中识别出典型的震积岩。其代表性沉积构造有:微断层和地裂缝、液化砂(砾)岩脉、震动液化卷曲变形、环状层理、负载构造、震积角砾岩和震浊积岩等,其中液化砂岩脉和震积角砾岩是主要类型;震积岩垂向序列划分为阶梯状断层段、液化砂岩脉层段、液化卷曲变形层段、震裂岩和自碎角砾岩层段、震塌岩和内碎屑副角砾岩层段、震浊积岩层段6个部分。震积岩研究有助于恢复古构造演化史和寻找岩性油气藏及构造-岩性油气藏;微断层、地裂缝和液化砂岩脉有利于改善储层条件,地震流体可促进烃源岩演化和成岩作用,同时震积角砾岩本身也是良好的储层。更多还原

【Abstract】 Based on the analysis of regional tectonic setting,this study identifies typical seismites of the Palaeogene Member 3 of Shahejie Formation in the south section of western sag,Liaohe depression through detailed observation of cores approximately at a depth of from 28 drillholes.In the study area,representative sedimentary structures include micro-faults,ground fissure,liquefied sandstone(conglomerate) dykes,liquefied crinkled deformation caused by vibration,annular bedding,load structure,seismo-breccias,and seismo-turbidites.Of these,liquefied sandstone dykes and seismo-breccias are the major types.The vertical sequence of seismites is classified into six intervals,i.e.,step fault interval,liquefied sandstone dyke interval,liquefied crinkled deformation interval,interval of shattered rock and autoclastic breccia,interval of seismic-induced collapsed rock and intraclastic parabreccia,and seismo-turbidite interval.Research of seismites helps the reconstruction of paleostructural evolution and the discovery of lithologic and structure-lithologic hydrocarbon reservoirs.The presence of micro-faults,ground fissure,and liquefied sandstone dykes is conducive to the improvement of reservoir conditions.Seismic fluid facilitates the diagenesis and evolution of hydrocarbon source rocks,while shattered breccia itself provides a good reservoir rock for hydrocarbon accumulation.更多还原