The reservoir fluid type is a key factor to evaluating productivity and identifying reserves scale during exploration and making development plans during production. Fast identification of reservoir fluid types while drilling can accelerate exploration and production. The fluid types of the Archaeozoic buried hill reservoir of M structure at the southwest margin of Bozhong Sag，Bohai Sea，East China are complex. According to the pressure-volume-temperature（PVT）phase analysis，four combined parameters based discriminant analysis and φ1 parameter based discriminant analysis were employed in identifying reservoir fluid types while drilling in the study area. The study demonstrates that the two methods based on standardized gas logging-while-drilling data witness poor consistency among the identified reservoir fluid types in the study area，while those relying on the test gas component from the well site obtain consistent and positive results. A model is built for the fitting relationship between the test gas component from the well site and standardized gas logging-while-drilling data，realizing the fast identification of fluid types in the buried hill reservoir while drilling and successful applications in the Archaeozoic buried hill reservoir of M structure at the southwest margin of Bozhong Sag.