青藏地区措勤盆地它日错深凹陷主含油气系统

它日错深凹陷位于青藏措勤盆地北部坳陷中，其内发育有主含油气系统和子含油气系统。主含油气系统的烃源岩为下白垩统郎山组，储层为上白垩统竟柱山组，盖层为下第三系牛堡组。该含油气系统的关键时刻为距今５４Ｍａ，有效圈闭主要是燕山运动晚期和喜山运动早期形成的构造圈闭，勘探有利区为新生代地层保存较完整的地区

MAIN HYDROCARBON-BEARING SYSTEM IN TAZICUO DEEP DEPRESSION OF THE CUOQIN BASIN IN QINGHAI-XIZANG AREA

here are two hydrocarbon\|bearing systems in Tazicuo deep depression at the north of the Cuoqin Basin, namely main\|bearing system and sub\|bearing system. Source rock of the main\|bearing system is in the Early Cretaceous Langshan Formation, and reservoir rock is in the Late Cretaceous Jingzhushan Formation, and seal rock is in the Niubao Group of Early Tertiary. The critical moment of the main\|bearing system is at the time before 54 million years. The structural traps formed during the Late Yenshan movement, and Early Himalayan cycle may be filled by hydrocarbon compounds. The region where the Cenozoic Era strata is preserved completely is favourable for oil and gas exploration.\=