Abstract:

The Fuyu reservoir is the intended interval of exploration in the Chaochang area of Songliao Basin. Confirming the stages of tectonic movement and the structural deformation history of Fuyu reservoir is significant for analyzing the formation and evolution of trap and petroleum accumulation and outsteping. We confirmed the stages of tectonic movements and the feature of structural deformation through mapping the structural evolution sections and palaeostructure maps. It is believed that from the beginning of depositing Fuyu reservoir is an unified downwarping region until the end of deposition of Nenjiang Formation, after that the reservoir underwent three main stages of tectonic movements, including the end of Nenjiang Formation, the end of Mingshui Formation and the end of Paleogene. The structural deformation of the Chaochang area is intensive in the east and south. The structural miniature was formed in the southeast of the Chaochang area at the end of Nenjiang Formation. The Changchunling anticlinal belt, which has higher structural latitude, and the Chaoyanggou terrace, which has lower structural latitude, were formed at the end of Mingshui Formation.The Changchunling anticlinal belt was shaped at the end of Paleogene, which has three anticlines, including Changchunling, Sanzhan and Wuzhan anticlines. And the shaped Chaoyanggou terrace belt was composed of Chaoyanggou and Fanshentun anticlines.

Key words: Fuyu reservoir, structural evolution, structural deformation, Chaochang area, Songliao Basin