Abstract:

Crude oil produced in Mao 62-92 injection well in Tuotai Oilfield,Daqing Oilfields differs differently from the crude oil of recovery bed from production well(Fuyu Yangdachengzi oil reservoir)in geochemical properties:1.the density and residual carbon of the crude oil are low;2.the contents of paraffin,saturated hydrocarbon and aromatic hydrocarbon are high;3.whole hydrocarbon index differs clearly from that of recovery bed crude oil.But that the geochemical properties of injection well crude oil are similar to that of Putaohua oil reservoir in neighbouring oilfield,this indicates that the crude oil of the injection well is buried shallower than that of producton well,that is to say,the first one belongs to Putaohua oil reservoir.

Key words: injection well, suspicious oil reservoir, recognition, geochemistry, Tuotai Oilfield