Abstract: In order to analyze the property of hydrocarbon adsorption in reservoir,oil fluid inclusions are often investigated by fluorescent microscope and micro spectrum.However,there are some problems in the testing for the uncertainty of fluid inclusions in reservoir due to the characteristics of lithology,oil-and-gas injection rate and sedimentary condition.Not only the samples from Well S87 and S102 but also the 8 samples from Well S110 are analyzed by the QGF-E and QGF before the quantitative grain fluorescence analysis of the reservoirs in Tahe Oil Field.The result shows that there is an interface between oil and water layers in the Carboniferous Bachu Formation and the Lower Silurian Kepintage Formation.The Ordovician Yinshan Formation,the Yijianfang Formation and the Lianglitage Formation are all oil layer,and the result agrees well with the logging data.This is important for the modeling of oil-and-gas formation in the Tahe area.