Abstract: The conditions, in terms of hydrocarbon source, temperature, pressure, tectonic activities and sealing, for the formation of condensate gas pools in the Tarim basin are analyzed and discussed. It is concluded that the gas-generating kerogens are of both the land-derived humic type and the marine sapropelic type, withthe two types generating gas condensates at different
thermal evolutional stages. The temperature and pressure ranges for the gas condensate accumulations in the basin are 70-130℃and 35-60 MPa, respectively. The existence of favorable regional capping beds is an important factor for the enrichment of gas condensates, while later phase tectonic reworking is the major factor for the formation of secondary gas condensate pools.

Key words: gas condensate, pool formation conditions, Tarim bas