【摘要】 柴达木盆地西部地区新生界断裂划分为同生逆断裂、后生同生逆断裂和后生断裂 ,背斜发育有同生断展背斜、后生断展背斜及生长背斜 ,昆北断阶区褶皱发育演化序列为同生断展背斜之上叠加了生长背斜 ,一里坪坳陷、茫崖坳陷褶皱发育演化序列是后生断展背斜上叠加了同生断展背斜 ,同生断展背斜之上又叠加了生长背斜。新生代生长构造格架由三期生长构造组成 ,古近纪—早上新世逆同生构造、中—晚上新世逆同生构造和中—下更新世生长背斜组成 ,不同构造单元构造格架组成略有不同。三期生长构造是由E—N12 盆地基底扭压整体拗陷作用、N22 —N3 2 盆地基底扭压差异拗陷作用和Q盆地基底扭压缓慢拗陷作用而形成的。构造圈闭主要有同生断展背斜、后生断展背斜、生长背斜、断鼻等 ,且具有明显的层次性 ,主要分布在昆北断阶、茫崖坳陷。同生逆断裂的长期活动有利于油气的运移、聚集 ,位于油源区附近的同生和后生断展背斜有利于油气聚集成藏。更多还原

【Abstract】 In west Qaidam basin, the Cenozoic faults are divided into three types: the growth reverse fault, the epigenetic-growth reverse fault and the epigenetic reverse fault. Growth fault-propagation anticline, epigenetic fault-propagation anticline and growth anticline develop in the area. The order of development and evolution of folds is characterized by that the growth anticline stacks on the growth fault-propagation anticline in Kunbei fault tarrace region, and that the growth fault-propagation anticline stacks on the epigenetic fault-propagation anticline and the growth anticline stacks on growth fault-propagation anticline in Yiliping depression and Mangya depression. The growth structural framework in the Cenozoic consists of three periodical growth structures: The reverse growth structure from the early Tertiary to the Early Pliocene, the reverse growth structure from the Midst Pliocene to the Late Pliocene and the growth anticline in the Late Pleistocene; and there is a little difference in structural framework’s composition for different structural unit. The three periodical growth structures are formed by basin basement wrench-compressive depressing in E-N¹₂, basin basement differential wrench-compressive depressing in N²₂-N³₂ and basin basement slowness wrench-compressive depressing in Q. The structural trapments mainly are the growth fault-propagation anticline, the epigenetic fault-propagation anticline, the growth anticline, the fault nose, etc., and they have distinct stacking characters, which are mainly distributed in Kunbei fault terrace and Mangya depression. A long-term activity of the growth reverse fault is advantageous to the hydrocarbon migration and accumulation, and the growth and epigenetic fault-propagation anticline in the vicinity of hydrocarbon source area are advantageous to the hydrocarbon accumulation.更多还原