Abstract
The composition of Yacheng condensate provides possible evidences of primary migration of petroleum by molecular solution in the aqueous phase. Aromatic hydrocarbons (HCs), especially benzene and toluene, make up a high percentage of the condensate. The abundance of each hydrocarbon (HC) in the condensate is mainly controlled by compound type and carbon number. The distribution of normal alkanes is discontinuous at C 16. Aromatic hydrocarbons are 3.8‰ isotopically heavier than the saturated hydrocarbons. The isoprenoid hydrocarbons are very abundant, especially pristane. The specific gravity of the Yacheng condensate is 0.85530 g cm −3, which is much higher than the average for condensates. These features are in good agreement with the HC solubilities in aqueous solution.
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