Abstract: Based on the principle of chromatographic fingerprint and proportion tests, a chromatographic fingerprint map database for three single layers such as P2l2-12, P2l2-22 and P2l2-32 of the upper sweet spot shale oil in Jimsar sag is established. The partial least square method is used to realize the productivity contribution rate calculation and dynamic monitoring of the single layers during 2-layer and 3-layer commingled productions for shale oil in the upper sweet spot of Lucaogou formation in Jimsar sag. The result shows that P2l2-12 and P2l2-22 are the main contributors for shale oil production in the upper sweet spot of Lucaogou formation in Jimsar sag, among which P2l2-12 is the main contributor to the commingled production of P2l2-12 and P2l2-22 in Well Ji-37 and Well Ji-171; while P2l2-22 acts as the main contributor to the commingled production of P2l2-22 and P2l2-32 in Well Ji-25 and Well Ji-173. During the commingled production of P2l2-12+P2l2-22 +P2l2-32, P2l2-22 provides most hydrocarbons in Well Ji-31, P2l2-12 is the main contributor and P2l2-22 is the minor contributor in Well Ji-174 and Well Ji-176. Additionally, the tracking study shows that the productivity contribution rate of P2l2-12 gradually decreases in wells Ji-174 and Ji-176 and P2l2-22 becomes the major hydrocarbon provider. An analysis is performed by combining the calculation results with the corresponding reservoir physical properties and oil saturation of each well, which proves the accuracy and rationality of the calculation results