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Sampled from the Gangxi oil field in the Huanghua depression, Bohaiwan Basin, the crude oil He and Ar isotopic&#13; compositions and their geochemical significance were investigated. The result shows that i) the 3He/4He&#13; values of the six oil samples free from air contamination indicate a mantle helium contribution ranging between&#13; 13.9% and 32.8% and averaging 24.1%, which means that the Gangxi oil field once had a tectonic background&#13; of the mantle-derived helium input and higher geothermal flow with an average of 75.0 mWm-2; ii) deduced from&#13; the 40Ar/36Ar aging effect the Gangxi oil should be derived from the Tertiary; iii) water injection is the main reason&#13; for the air contamination for the Gangxi oil noble gases and the relations between 3He/4He and 4He/20Ne as&#13; well as 40Ar/36Ar and 4He/20Ne are of an applicative potential in estimating the water injection effect and the connectivity&#13; of producing formations. The search for the crude oil He and Ar isotopes provides a new approach to&#13; inferring natural gas and oil sources, tectonic backgrounds, geothermal flow and water injection effect

Crude oil He and Ar isotopic characteristics and their geochemical significance: an example from the Gangxi oil field in the Huanghua depression