Abstract: The indicator system of screening and evaluating reservoirs prior to CO₂injection is a very important research target，because of the heterogeneity of reservoir property and human factors，in order to screen and evaluate the selected reservoirs with CO₂ injection，the comprehensive evaluation method which can reflect the potential of CO₂ injection reservoirs with dual uncertain condition is set up based on the gas injection evaluation indicator system established with reservior geology and fluid property etc.，and the multi-factor decision-making method under the dual uncertain condition is introduced，the method can be used in screening and evaluating the reservoirs prior to injecting different media to improve CO₂flooding and enhance recovery.

Key words: CO₂ injection, pilot, screen reservoir, method, evaluation, IOR