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本文从制约石油初次运移的因素入手，结合地层中的实证，揭示了残留死油的存在。源岩生成的油气中，不能向外运移的残留死油残留在源岩中，多余部分才是可运移的油，二者间的界限称为运移门限值。在此基础上对油源岩进行了分类，提出了可形成油藏的有效运移门限值的概念和划分标准，并指出它受控于有机质类型、有机碳含量和热演化程度。最后提出了死油量的估算方法和可供油气资源评价中实用参考的估算值。
This article starts from the factors restricting the primary migration of oil and reveals the existence of residual oil in combination with the empirical evidence in the strata. In the oil and gas generated from the source rock, the remaining dead oil that can not be transported outwards remains in the source rock, and the excess is the migratable oil. The boundary between the two is called the migration threshold. On the basis of this, the source rocks are classified and the concept of the effective transport threshold and the classification criteria for the formation of the reservoir are proposed. It is also pointed out that it is controlled by the type of organic matter, organic carbon content and degree of thermal evolution. Finally, the estimation method of dead oil amount and the practical reference value available for oil and gas resource evaluation are put forward.