Abstract:

Most of the gas fields in China have been formed and finalized in Neogene Quaternary,which distribute widely in various petroliferous basins.The gas pools in China are generally characterized by late or super late hydrocarbon generation and accumulation,and by restriction of tectonic evolution since Neogene.The close relationship between the gas pools in China and tectonic evolution since Neogene can be summarized as follows:(1)In west China,the foreland basins,formed during this period,constitute one of the main gas accumulation provinces in China,and provide favorable conditions for the formation of numerous gas fields.The gas fields in these basins have mainly been formed and finalized in this period.(2)In central China,all the gas fields in Sichuan basin have been formed and finalized in this period,while gas accumulations in Jingbian Wushenqi area in Erdos basin have further been enriched in this period.(3)In east China, these tectonic movements create favorable geological conditions for late reservoiring of gas in Baohai sea area,and promoting the formation of some gas fields in other basins(or depressions).(4)In offshore area,they promote not only the rapid formation of organic origin gas fields,but also the formation of inorganic origin non hydrocarbon gas fields,as well as the formation of a unique reservoiring pattern with mixed source of organic and inorganic origin genetic gases.

Key words: China, gas pool, formation and finalization, Neogene, Quaternary, tectonic movement