The theoretical bases for dynamic monitoring of chromatographic fingerprint of reservoir fluids include:1) crude samples from the same oil layer have similar chromatographic fingerprints;2) crude samples from different oil layers have different chromatographic fingerprints;3) fingerprint compounds can be partitioned.The results of above-mentioned dynamic monitoring are key basis for adjustment of development plan and selection of EOR measures.A mathematical model for dynamic monitoring of chromatographic fingerprint was set up and applied to the X37-0 wellblock in an eastern oil field.The following calculation results are obtained.Pay zone NgⅡ

3

contributes 88.98% and 86.09% to the total production of well Xi37-1 and well Xi38-1(both are in commingled production of NmⅢ

3

and NgⅡ

3

) respectively

while NmⅢ

3

contributes 11.02% and 13.91% respectively.Under the same experimental conditions

a "Mix 16" sample is prepared with samples from NmⅢ

3

and NgⅡ

3

according to a proportion of 85:15.Fingerprint parameters from Mix 16

the same as those from the measured samples

are recorded

analyzed and tested.It is proved that the model calculations are correct.