Abstract: According to the detailed investigation of bitumen content in the outcrops of upper Sinian Dengying formation around the Micang Mountain,this paper has confirmed the possibility of early oil-gas accumulation in Dengying formation.It is pointed out that there used to be large scale of paleo-oil pool.Depending on the information of petrology，geochemistry and geophysics,this paper has analyzed the static condition for hydrocarbon accumulation,such as source rock,reservoir rock and cap rock .On the basis of Micang Mountain structural evolution,we also analyzed the evolution process of the trap and preserving condition,and suggested that the four centers(petroleum generative center,natural gas generative center,gas storing center,gas preserving center) for hydrocarbon accumulation in study area are all in the same place.This is very favorable for natural gas maintenance,and the Dengying formation in the area has good prospect for gas exploration.

Key words: Sinian system, Dengying formation, Paleo-oil pool, coupling of four centers, front area of Micang Mountain