Natural gas comprises many kinds of hydrocarbons gases. Their scientific names are methane (CH2), ethane (C2H6), propane (C3H8), butane (C4H10), nitrogen (N2), carbon dioxide (CO2) etc. The main one, methane, represents a content of more than 70 %. Before using, each will be separated. Apart from hydrocarbon, there are others like carbon dioxide (CO2), hydrogen sulfide (H2S), nitrogen (N2) and water (H2O). These gaseous compounds can be extracted through a process of refinery. Each separated gas can be used to produce many different kinds of products.

As for NGV (or CNG for vehicle), the amount of Open Service Stations are  469 stations across Thailand. ( at 6 MAR 2012 ) The location on google map