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目的：低渗油藏具有启动压力现象而使渗流不遵循达西定律，研究油藏启动压力规律，能更好地进行油藏开发设计和油藏开发动态分析。方法：利用渗流理论进行研究和推导，同时结合室内试验资料进行验证。结果：研究表明，油藏的启动压力梯度与其液体的流度呈双曲反比例关系，二者的乘积为一常数，该常数仅与油层及通过的液体有关；建立了相应的表达式，并简单介绍了在油藏中的具体应用。结论：该规律为进行油藏开发层系的划分、井网部署及已开发油藏层间动用状况等研究提供了一种新的理论方法和工具。
OBJECTIVE: The low permeability reservoirs have the phenomenon of starting pressure so that the seepage does not follow Darcy’s law and study the law of starting pressure of reservoirs, so as to make better the reservoir development and design and the dynamic analysis of reservoir development. Methods: The theory of seepage was used to study and derive the results. At the same time, the data were verified by laboratory experiments. Results: The study shows that the initial pressure gradient of a reservoir is hyperbolic inversely proportional to the fluid flow. The product of the two is a constant, which is only related to the oil layer and the liquid passing through it. The corresponding expression is established and is simple The specific application in the reservoir is introduced. Conclusion: This law provides a new theoretical method and tool for the study of the division of reservoir development strata, deployment of well pattern and utilization of developed reservoirs.