According to operational principle of pyrolysis gas chromatography and its judgment on water flooded formation, the new technique of judging water flooded formation applied pyrolysis gas chromatography data, combined logging data, well testing data and test production data, and carried on evaluation on water flooded degree by using the example of Fuyu oil field closed core well.

It is discovered that geochemical parameters of rock pyrolysis and routine log information are closely related with the wateredout degree of reservoirs by analyzing the pressure coring data of Tuo 2-1-Jian-1803 well.

Quantitative identification of reservoir watered-out degree by using fluorescence microscopic image technique;

The author set up chromatograph charts of oil reservoir compositions for different watered-out degrees and watered-out degree discriminating standard by water drive oil ratio.

The relationships between the flooding degree and the main mechanical properties, airdry density, anatomy features were researched.