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油藏条件下的相控和气洗分馏作用使得油藏中油气的物理性质和化学组成发生了明显变化。通过不同温压条件下的 PVT实验及其产物测量为该观点提供了十分有意义的科学证据，其主要结论如下： (1)总的来看，气洗分馏作用较由温度和压力引起的相控分馏作用明显，气洗作用是油藏中原油性质（如：含蜡量、密度和粘度等）发生重大变化的最主要因素； (2)PVT分馏不仅导致凝析油中饱 /芳比值的异常高值，而且饱 /芳比值在凝析油和正常油中存在相反的分馏变化规律； (3)与温度变化和气洗作用相比，压力变化是导致油藏中天然气碳同位素产生明显且规律性分馏的主要因素（实验中天然气δ 13C值变化幅度高达 1.3‰左右）； (4)轻烃参数的某些规律性变化与相控和气洗分馏过程有关，揭示了重要的成藏信息，可以用来区分和确定温压相控分馏和气洗分馏这两种最基本的成藏过程。
The phase control and gas-wash fractionation under reservoir conditions make the physical properties and chemical composition of oil and gas in reservoirs change obviously. The PVT experiment and product measurement under different temperature and pressure conditions provide very scientific evidence for this view. The main conclusions are as follows: (1) In general, gas-liquid fractionation is more effective than temperature and pressure induced phase Controlled fractionation is obvious. Gas-washing is the most important factor for the significant changes in the properties of crude oil in the reservoir (eg, wax content, density and viscosity); (2) PVT fractionation not only leads to the abnormal saturation / aromatic ratio in condensate (3) Compared with temperature change and gas washing, the change of pressure caused the obvious and regular carbon isotope of natural gas in the reservoir (4) The regular changes of light hydrocarbon parameters are related to the phase-control and gas-wash fractionation process, revealing important reservoir formation information, which can be used To distinguish and determine the most basic two processes of temperature and pressure controlled fractionation and gas-wash fractionation.