Abstract:

Gas producing wells in Shaximiao gas pools,Xinchang Gasfields are all located in the extent of paleostructures,which indicates that the paleostructures laid a foundation for the distribution and the boundary of the gas pools.From lower to higher positions,the contents of methane,heavy HC,CO₂ and H₂S,the dry index,ΔR₃ value of natural gas all change regularly.This shows that the paleostructures have controlled over the migration of gas.Recent structures may have considerable destructiveness,but thay cannot change the distribution pattern.Their control over gas pools is restricted in the superposed positions of the paleostructures with recent structures.