冷湖五号燕山期叠瓦逆冲构造的发现

笔者通过钻井、电测、地震等资料的解释，在柴达木盆地冷湖五号背斜核部的下侏罗统中发现了叠瓦逆冲构造，并认为其形成于燕山运动晚期。该发现对认识本区燕山运动的性质和正确评价本区的石油及煤炭资源有重要意义。冷湖五号中新生代的构造发育历史可划分为5个阶段，即早株世伸展裂陷阶段、燕山晚期叠瓦逆冲构造发育阶段、早第三纪早期同生逆断层发育阶段、早第三纪晚期至晚第三纪中期背斜构造发育阶段和晚第三纪晚期至第四纪背斜构造改造阶段。

The finding out of the Yanshan imbricate thrust structure in Lenghu 5

Jurassic system is of wide distribution in the Northwestern of China.It is important for not only exploration and development of petroleum and coal but also the research of regional structure evolution history, to recognize correctly the deformation characteristics of the Jurassic. The author finds out the imbricate thrust structure within low Jurassic series in Qidam basin Lenghu 5 fold core and considers the structure formed in late Yanshan movement. This finding is important for understanding the nature of Yanshan movement and evaluating correctly petroleum and coal resources in the region. The structure growth history of Lenghu 5 in Mesozoic and Cenozoic eras can be divided into five stages which are early Jurassic epoch extension rift stage, late Yanshan imbricate thrust stage, early period of Paleogene contemporaneous reverse faults growth stage,from late period of Paleogene to middle period of Neogene anticline growth stage and from late period of Neogene to Quaternary the anticline reformed stage.