At the beginning of 2009,the dispute about natural gas supply happened between Russia and Ukraine once more,this problem had quite an impact not only on Russia and Ukraine,but on European Union.

The Russia-Ukraine natural gas dispute at the beginning of 2006 is the epitome of the relation between these two countries,and a test to the international energy pattern as well.

This paper analyzes some factors that affect the natural gas market,and probes into and sums up the competition situation of natural gas terminal market.

Supply and demand analysis for world petroleum industry and Chinese natural gas;

Comprehensive evaluation method for sealing ability of mudstone caprock to gas in each phase;

Division of seal evolution stages of shale caprocks to gas in each phase and its research significance;

Reasonable injection pressure and rate can improve the development response of gas injection and the recovery factor of carbonate buried hill reservoir.

Based on a thermodynamic model of gas_liquid equilibrium, the variation of phase behavior in a volatile oil system during gas injection has been investigated.