Abstract: The condensate gas reservoir of Paleogene in Kekeya field, Tarim basin, is a carbonate gas pool with super-depth of 6400m,superhigh pressure of 128 MPa and pressure cofficient of 2.0. At the present, only Keshen Well 102 is producing. This well was brought into poduction on Aug. 7, 2003, and began to yield reservoir water on Dec. 28, 2003. The eservoir water analysis provided CaCl₂ and NaSO4 types of water. This paper presents the former (CaCl₂) is formed due to declining of the reservoir pressure and squeezing: -out of residual water in shale of the supethigh pressure gas eservoir; the ltter (Na₂SO₄) is due to intrusion of local lenticular water or edge water.

Key words: Tarim basin, Kekeya field, supendeep well, superhigh pressure reservoir, reservoir water, water type