两种砂岩碎屑组分统计方法的比较

砂岩碎屑组分统计是确定岩石类型和物源区特征的主要方法之一,常常采用的方法有目估法、面积法、直线法和点计法。文章利用误差分析、相关性分析和Dickinson源区构造背景判别三角图,比较了直线法和点计法的差别;实验数据分析表明,2种方法测量结果之间存在的差异微小,对岩石类型以及物源区的判别不受影响。但是,点计法在砂岩碎屑组分统计中,具有简单、方便、省时的特点,可以广泛应用。

Comparison between two methods for statistical study of detrital composition of sandstones

The statistical study of detrital composition of sandstones is carried out in order to distinguish rock types and features of provenance,and the common statistical methods includes the visual estimation method,the area-counting method,the line-counting method,and the point-counting.In the paper,the differences between the line-counting method and the point-counting method are compared by means of error analysis,correlation analysis and the Dickinson triangle diagram of structure background of provenance.Analysis of the experimental data shows that there are some tiny differences between the measured results of the two methods,but the discrimination of rock types and features of provenance is not affected.By comparison with the line-counting method,the point-counting method is easier and more convenient and efficient,so it can be used widely.