目前，国内外计算井网密度的方法较多，一般是从简单油藏开发过程中总结而来，对于复杂断块油田而言，计算效果并不理想。本文通过概率分析方法，对不同复杂程度开发单元进行研究，建立了一种适用于复杂断块油藏开发中、后期调整的井网密度计算方法，并结合开发动态参数给出了方法的简化计算公式。 At present, there are many methods for calculating well density at home and abroad, which are generally summarized from the simple reservoir development process. For complex fault-block oil fields, the calculation results are not satisfactory. In this paper, the probabilistic analysis method is used to study the development units with different degrees of complexity, and a calculation method of well pattern density suitable for middle and late adjustment of complex fault block reservoirs is established. A simplified calculation of the method is given in combination with the development of dynamic parameters formula.