In this paper, the geochemical characteristics of Yan9 crude oil from west Jingbian Oil Production Plant were analyzed by means of crude oil assay, gas chromatography and gas chromatography-mass spectrometry. The physical properties, group components, saturated hydrocarbon fractions and biomarkers of Yan9 crude oil were systematically studied. The results show that the Yan9 crude oil of Yan 'an Formation has the characteristics of medium-low density, low viscosity, medium-low freezing point, high saturated hydrocarbon content, high saturation aromatic ratio, low aromatics, non-hydrocarbon and asphaltene content.
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