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柴达木盆地是一个大型的中、新生代沉积盆地,面积约十二万平方公里,是一个很有远景的含油气盆地。在盆地北缘,已发现了中生代油田和以中生界为油源的次生油藏。这说明中生界沉积是盆地北缘油气的主要来源之一。一、中生界地层及生、储油条件盆地中生界沉积,三叠系仅在五彩山和大头羊煤矿有分布;侏罗、白垩系在盆地北缘及阿尔金山山麓有广泛分布,在盆地南侧格尔木以东的蛇头山、依克高里有零星分布,德令哈虽有沉积,厚度仅有270～300米。侏罗、白垩系地层,以大煤沟至红山沟一带沉积较全,厚度达2200米以上。其余各地,仅沉积了中、上侏罗系和白垩系的部分地层(见图1)。
The Qaidam Basin is a large-scale Mesozoic-Cenozoic sedimentary basin with an area of about 120,000 km2. It is a promising petroliferous basin. In the northern margin of the basin, Mesozoic oil fields and secondary reservoirs with Mesozoic origins have been discovered. This shows that the Mesozoic sedimentation is one of the major sources of oil and gas in the northern margin of the basin. First, the Mesozoic strata and genesis, reservoir conditions of Mesozoic sedimentary basin, Triassic only in the Wucai Mountain and Datu sheep coal mines are distributed; Jurassic, Cretaceous in the northern margin of the basin and the Altun Foothills are widely distributed in the In the south of the basin, there are sporadic distributions in the area of Shetoushan east of Golmud and in Erkholg. Although there is deposition in Delingha, the thickness is only 270-300 meters. The Jurassic and Cretaceous strata, with the deposition of Daconggou to Hongshanggou, have a full thickness of more than 2,200 meters. In the rest, only part of the Middle, Upper Jurassic and Cretaceous strata were deposited (see Figure 1).