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地下深部的烃类物质在由断裂诱导的压力释放和过量干气注入的共同作用下会导致油、气两相流体的产生．由于不同原油组分在气液两相中的分配系数不同，低碳数的烃类更易溶解在气相中，形成凝析油；而高碳数的烃类则残留在油相中，形成蜡质含量较高的油藏．这种分馏过程同时导致通常与源岩有机质或热成熟度有关的原油组分参数（如饱和烃／芳烃值）和甾萜烷分子参数的广泛变化，原油δ~(１３)Ｃ值也因此变重１％左右．
Hydrocarbons in the deep underground can lead to the formation of oil-gas two-phase fluids under the combined action of fracture-induced pressure release and excessive dry gas injection. Due to the different partition coefficients of different crude oil components in gas-liquid two phases, low-carbon hydrocarbons are more likely to dissolve in the gas phase to form condensate, while high-carbon hydrocarbons remain in the oil phase to form waxy High content of the reservoir. This fractionation process also results in the wide variation in parameters of the crude oil components (eg, saturated hydrocarbons / aromatics) and the steroid alkanes parameters generally associated with the organic matter or thermal maturity of the source rock, as a result of which the δ 13 C value of the crude oil About 1% weight.