Abstract:

Beidagang structural belt was experienced multi stang tectonic movements.It has both the thrust faulting system formed in Indosinian early and mid Yenshan epoch and extensional fault system formed in late Yenshan Himalayan epoch.The thrust fault and extensional fault had appearent control over the development of fracture cave reservoir,oil and gas potential,trap sealing conditions of Lower Paleozoic buried hill reservoir in this belt.The researches indicate that the fractures formed by thrusting and the related folding promoted the karstification and formation of the fracture cave resrevoir;source,maturity and afflux of buried hill reservoir were related to extensional faulting in Cenozoic;the sealing of buried hill traps were determined by both the lateral sealing of hasement involved normal fault and the contribution of mormal fault in the cover rock to top sealing.

Key words: thrust fault, extensional fault, buried hill reservoir, Beidanang structural belt