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Further calculating plots in a triangle for the classification of sandstones

ZHANG Meng~1, HUANG Si-jing~1, FENG Wen-xin~2, WANG Lei~1, ZHENG Wen-bao~1, ZHAN Xin~1, HAN Jun-zheng~1, CHENG Zhen-xing~1, PENG Jing-song~1 1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China; 2.Special School of Zhengzhou Industry & Trade, Zhengzhou 450007, China  
This paper provides further calculating plots in a triangle for the classification of sandstones. By comparison and study, the authors got the following conclusions: (1) Based on contrasting the triangle of equilateral with that of isosceles for the classifications of sandstones, the further calculating model is simplified as XR+Q/2, YQ, which is deduced by two theories of the linear equation and the similarity triangles. The formula is just relevant to the value of Q and R, but not to the type of triangle(whether the isosceles triangle or the equilateral triangle)directly; (2) Using the logic function,the automatical discriminant model for the classification of sandstones is established by Microsoft Excel.This method is very convenient for the large data; (3) The quantitative instances research for the large data of composition in a triangle for the classification of reservoir sandstones has proved the favorable effect of the automatical discriminant model and the simplified formula for the classification of sandstones.
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