The studied result shows that FHVSM can be used to describe the gas mixture adsorption equilibrium and simulation calculations of adsorption equilibrium for both hydrocarbon gas mixture and non-hydrocarbon gas mixture.
The CO_2 mainly comes from deep-earth,N_2 isthe product of biochemical process and He is the product of the decay of radio-element. Gaseous hydrocarbon includes biochemical methane and thermodegr-adation hydrocarbon gas.
There contains non-hydrocarbon CO2 and N2 universally in natural gas of Y basin and the N2 content appear negative-correlate with overall of inorganic CO2 and positive-correlate with hydrocarbon gas which mainly is CH4. According to N2 content .
Several available methods for identifying non hydrocarbon gas zones effectively are given, such as sonic density differential porosity method, overlap of porosity ratio, sonic density porosity ratio method, differential porosity ratio method, and gas saturation method.
Light hydrocarbon gas is mixed by light hydrocarbon fuel and air,it is a kind of substitute of natural gasbecause of its character is very alike the character of liquefied petroleum gas mixed with air,but more cheaper.