Abstract:

 Condensate gas is an important oil and gas resource, which attracts more and more attention as indepth exploration and discovery continuing. A total of 106 giant condensate gas fields were discovered in the world. They are distributed in more than 70 sedimentary basins, mainly in West Siberia Basin, Marginal Caspian Basin, Persian Gulf Basin, Zagros Basin, U.S. Gulf of Mexico, Tarim Basin and so on. According to the systematic investigation and study of global major giant condensate gas fields, it is found that these condensate gas fields, located in structural traps, are mainly distributed in the strata from the Carboniferous to the Neogene; that they have poor reservoir properties, being the type of low porosity and low permeability. The density of condensate gas and condensate oil is relatively low. The formation and distribution of condensate gas fields are mainly controlled by the distribution of effective hydrocarbon source rocks, favorable reservoircap combination, trap types, late accumulation, specific temperature and pressure systems, and hydrocarbon system component. According to their formation mechanism, the condensate gas pools are divided into primary condensate gas pools and secondary condensate gas pools.

Key words:  condensate gas field, global distribution, temperature and pressure system, formation mechanism