| 马光华,魏文懂,钱凤燕.浅谈储层渗透率变异系数计算方法[J].地质找矿论丛,2013,28(2):256-262 |
| 浅谈储层渗透率变异系数计算方法 |
| Discussion on the variation coefficient calculation method of reservoir permeability |
| 投稿时间：2012-05-25 |
| DOI：10.6053/j.issn.1001-1412.2013.02.014 |
| 中文关键词: 变异系数 正态分布 对数正态分布 Dystra-Parsons 劳伦兹系数L |
| 英文关键词:variation coefficient Normal distribution logarithmic normal distribution Dystra-Parsons Lorenz coefficient |
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| 中文摘要: |
| 储层的渗透率变异系数、极差、突进系数等是渗透率非均质程度的定量表征。文章探讨了渗透率变异系数的计算方法,认为:变异系数等计算方法与数据分布类型有关,变异系数等参数的计算需根据数据分布特征来选取适合的方法。劳伦兹系数与数据分布类型无关;劳伦兹系数是有界的,分布于0~1之间。尤其是在对数正态分布条件下,劳伦兹曲线、基尼系数完全由标准差σ决定,劳伦兹曲线、基尼系数以及σ这三者间存在着一一对应关系。劳伦兹系数可以用于储层非均质性定量评价。 |
| 英文摘要: |
| Variation coefficient, range and dash coefficient of reservoir permeability is the quantitative characterization of heterogeneity of the permeability. This paper discusses the variation coefficient calculation method. The variation coefficient calculation method is related to data distribution type and the proper variation coefficient calculation method is selected according to characteristics of data distribution. Lorenz coefficient is independent with data distribution type and is bounded by and distributed in the range of 0 to 1. Especially under condition of logarithmic normal distribution, Lorenz curve and Gini coefficient are completely determined by the standard deviation σ. Lorenz curve, Gini coefficient and σ have one-to-one correspondence. The Lorenz coefficient can be used in quantitative evaluation of reservoir heterogeneity. |
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