Abstract:

Generally,the shallow gas reservoirs refer to what are buried in the shallow with complex origin,not rich reserve,low abundance,wide distribution,low pressure and so on.In this article,the authors research the the controlling factors of shallow gas reservoir by setting a example of Heidimiao reservoir of Punan area,northern Songliao Basin.In this area,rich hydrocarbon source in the area provides a resource base,qualitified cover conditions and stable groundwater conditions for preservation of natural gas play an important role,T1-T06 or T2-T06 fault development and distribution are the necessary conditions for the Heidimiao oil and gas accumulation,the evolution of tectonic deformation before and after Mingshui inversion plays a further role in the transformation of the distribution of oil and gas,the high palaeostructure bands also are favorable,which gas migrated and accumulated to,Heidimiao oil layer is of good reservoir conditions,which provides a favorable environment for oil and gas reservoir,match of the sand bodies,structure and fault control the hydrocarbon accumulation and is the key.The authors sum up the accumulation model of Heidimiao oil layer on the basis of the research above.The research results can guide the exploration and development of the similar shallow gas reservoirs to a certain extent.

Key words: shallow gas reservoir, Punan area, Heidimiao oil layer, main controlling factors of hydrocarbon accumulati, accumulation model, Songliao Basin