Hydrocarbon migration system in complex geological bodies at Chepaizi area,western Junggar Basin
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摘要: 车排子凸起为准噶尔盆地西部隆起的次级构造单元,已发现了春光和春风2个油田,探明石油地质储量6 061×104t.针对准噶尔盆地西缘车排子地区复杂地质体,重点研究了车排子地区油气输导体系格架构成、油气输导驱动机制及输导体系对油气分布的控制作用.研究表明,车排子地区为典型的斜坡带,红车断裂带起主要输导作用,与其连通的骨架砂体联合作用,以大规模垂向和横向运移为主,主要形成构造油藏或岩性-构造油藏.地层超剥带不整合起主要输导作用,以横向运移为主,主要形成地层或构造-地层油藏.下切谷沉积体系作为油气横向运移通道,在河谷砂高部位形成河谷充填型岩性油气藏.Abstract: The Chepaizi Arch is a secondary tectonic unit in the western uplift of the Junggar Basin.Two oil fields,Chunguang and Chunfeng,have been discovered,and the proven oil reserves are 6 061?104 t.As to the complex geological bodies in the study area,the framework,driving mechanism and its controlling on petroleum distribution of hydrocarbon migration system have been analyzed.It has been concluded that,in the Chepaizi area which is a typical slope,the Hongche Fault Belt plays the most important role in migration,and the connected matrix sand bodies also work as pathways.Vertical and lateral migrations of big scale are very common,mainly generating structural or lithologic-structural reservoirs.In overlying and erosion belt,unconformities work as the main pathways.Lateral migrations are common,mainly generating stratigraphic or structural-stratigraphic reservoirs.In the higher positions of sand valley,entrenched valley depositional system serves as lateral pathways,resulting in lithologic reservoirs.
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