Abstract: Natural gas distribution in Daan-Xingzhao Region is seemingly a function of structural control as indicated by the concentration of natural gases in the structural highs or along the axial positions of nose structures. However, the great variation of gas shows in exploratory wells located on different structural noses implies the complexity of pool-forming conditions in this region. It is proposed in this paper that the main factors controlling gas accumulation in the studied area are distribution of faults and sand bodies, while the level of“matching”of directions of nose plunging, fault stretching and sandbody wedging determines the easiness of gas-pool formation
and the size, type and distribution of gas pools. Furthermore, natural gas accumulating within the hanging wall of faults is an important expression of fault controls over pool formation in this region.

Key words: Songliao basin, Daan-Xing, Natural gas, Gas deposits, Migratio