Abstract
The phase diagram of the condensate gas reservoir in the Ordovician lithologic trap of Well TZ86 was recovered using PVTsim software with geochemical inputs (well fluid components and experiment data). The results show the error between the recovery and measured phase diagrams is within a reasonable range, indicating the reliability of the recovery result. The recovery phase diagram shows an order of CP-Pm-Tm, and the current reservoir temperature and pressure (138.49°C, 65.10MPa) confirms that the fluid belongs to the condensate gas phase currently and turns to the condensate gas-condensate oil coexistence phase when it is mined to the surface condition. The components rich in gaseous hydrocarbons caused by the gas charging in the Late Himalayan and the temperature and pressure condition determined the formation of condensate gas reservoirs in the Tazhong Uplift.
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