The Denglouku Formation in Gulong-Changjiaweizi region is still immature in petroleum exploration

especially for tight sand gas.Based on a systematic analysis of gas accumulation conditions in respects of source rock

reservoir and preservation and a comparison with the basic accumulation conditions of deep basin gas reservoir

we discussed the f possibility of formation of deep basin gas reservoir in the Denglouku Formation of Gulong-Changjiaweizi region.The results show that the 2

nd

member of Dengkouku Fm (K

1

d

2

) and its conterminous layers in Gulong-Changjiaweizi region have favorable geological conditions for the accumulation of deep basin gas

including tight sandstone reservoirs with low porosity and low permeability

abundant and continuous gas charging

stable and gentle structural background as well as close superimposition of source rocks and reservoirs.Therefore

the Gulong-Changjiaweizi region could be favorable for accumulation of deep basin gas in the northern Songliao Basin.The K

1

d

2

and its conterminous layers within the effective gas generation area of K

1

d

2

source rock and its periphery may be the major target for future deep basin gas exploration.