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运用煤岩学方法，研究了伊宁煤田Ya－8煤的成煤环境及其煤相。该煤层主要形成于上、下三角洲平原地带，划分出四种煤相。用煤岩特征来划分煤相是成煤环境研究的有效手段。
Using the method of coal petrology, the coal-forming environment and coal facies of Ya-8 coal in Yining coalfield are studied. The seam is mainly formed in the upper and lower delta plain areas, divided into four coal facies. It is an effective means to study the coal environment by dividing the coal facies with coal rock characteristics.