Gini系数在镜质体反射率量测分析上之应用

该研究主要利用Gini系数来探讨镜质体反射率量测上不均性的结果,由单一煤样之水洗样(Y₂)及富集壳质组之样品(Y₃),与原始样(Y₁)作Gini系数的比较。分析显示水洗样Y₂之镜质体反射率有向平均值集中的情形,而富集样Y₃之Gini系数则有向平均值两端分布的趋势;向高值端的部分系受水洗的影响,而向低值端的发展,系受壳质组富集的影响。由Gini系数特性的研究可推广至已知再沉积材料之镜质体反射率的量测上,以取得一个可靠之Gini系数分布范围,作为将来分析样品时的参考。 

APPLICATION OF GINI COEFFICIENT ON THE ANALYSIS OF VITRINITE REFLECTANCE MEASUREMENT

In order to evaluate the distribution of measured vitrinite reflectance data,Gini coefficient was applied in this study.Three groups of coal samples were prepared for the measurement of vitrinite reflectance,namely the original sample(Y 1),water washed sample (Y 2) and exinite enriched sample(Y 3) after denstty centrifuge separation.Gini coefficients were calculated and compared among them afterwards. The smaller Gini coefficient of Y 2 indicates a better kurtosis in the distribution of vitrinite reflectance,which can be explained by the effect of washing.On the other hand,the larger Gini coefficient of Y 3,a worse kurtosis in reflectance distribution,can be explained by both water washing (right shift) and exinite enrichment (left shift).The Gini coefficient is expected to be applied further to sedimentary source and provenance studies in the future.