用时间平均公式计算孔隙度φ时,将公式中的主要参数——储集层时差△t及骨架时差△t_(ma)。作为随机变量处理。本文讨论对随机变量△t、△t_(ma)的抽样序列的取值方法并给出其概率密度函数,在此基础上按蒙特卡罗(Monte—Carlo)法求得储集层孔隙度φ的概率分布函数统计估计值。这种方法可以避免目前解释中读值的人为误差,并为储量计算提供一组孔隙度的概率分布值。 Calculating the porosity φ using the time-averaged formula, the main parameters in the formula, reservoir turbulence Δt and skeletal turbulence Δt ma. As a random variable processing. This paper discusses the sampling method of random variables △ t, △ t ma (ma) sampling method and gives its probability density function, on this basis, according to Monte-Carlo method to obtain the reservoir porosity φ Probability Distribution Function Statistical Estimation. This method avoids human error in reading the current interpretation and provides a set of porosity distribution probabilities for reserve calculations.