柴达木盆地北缘中新生代构造演化与油气的关系

The Relationship between Tectonic Evolution and Petroleum in the North Margin of Qaidam Basin

循着构造演化史的脉络 ,对六期关于柴达木盆地北缘构造及沉积格局产生较大影响的构造运动分别进行了阐述 ,并重点阐明了各期构造运动与该区油气成藏条件的关系。指出晚期印支运动使柴达木盆地产生了三叠纪晚期的零星断陷 ,随后开始了侏罗纪大规模的坳陷湖相沉积 ;早期燕山运动造成了该区沉积中心 (即后期的生烃中心 )的大规模迁移 ;晚期燕山运动使柴达木盆地进入了整体沉降的坳陷阶段 ,有利于烃源岩的迅速成熟生烃 ;早期喜山运动形成了该区主要构造的雏形 ,该期形成的古圈闭与生烃史配置良好 ;晚期喜山运动。

Along the tectonic evolution history of the north margin of Qaidam Basin,this paper expounds 6 tectonic movement episodes respectively which had relatively big influence to structural and depositional framework of the north margin of Qaidam Basin ,especially the relationship between every tectonic movement episode and oil accumulating conditions. It is pointed that a Late Triassic limited rife sequence was developed in Qaidam Basin during Indosinian Movement, Early Jurassic lacustrine deposite of a large scale depression began to develep.the depocenter and oil generating center was migrated during Early Yanshan Movement. Due to Late Yanshan Movement ,the whole Qaidam Basin entered into depressing stage which was favorable for rapid maturation of source rock.The Early Himalayan Movement caused formation of main structions which has good correlation with maturation history of source rock.Late Himalayan Movement and New tectonic Movement relatively destroyed oil accumulation.