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储层非均质性是油气田地质和开发工程中经常需要解决的问题，因为它在某种程度上决定了油气田内各井的油气产能。根据美国一些开发多年的油气田产量等生产数据（如累积产量、年度产量和月度产量等），利用数理统计方法结合地质分析提出了月度产量变异系数、年度产量变异系数和累积产量变异系数等特征参数，这些参数能有效地反映储层层内和平面非均质特征，对于高含水期的老油气田油藏地质模型研究很有帮助。
Reservoir heterogeneity is a problem that often needs to be solved in the field of oil and gas geology and development because it determines to a certain extent the oil and gas production capacity of each well in the field. According to some production data (such as cumulative production, annual output and monthly output) of the developed oil and gas fields in the United States for many years, the monthly output variation coefficient, the annual output variation coefficient and the cumulative production variation coefficient are proposed by using mathematical statistics and geological analysis. , These parameters can effectively reflect the in-reservoir and in-plane heterogeneity, which is very helpful for the study of reservoir geological model in the old oil and gas fields with high water cut.