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作者采用环境参数、相组合、定性与定量相结合的综合分析方法，将研究区山西组分为４段１９层４２个微相，并归属为泻湘——潮坪及滨海三角洲两大沉积体系．广布的二＿１煤沉积环境就是在总体海退与短暂海侵、泻湖海湾、潮坪及泻湖海湾、沼泽进一步泥炭沼泽化而成；二＿１煤层厚度主要是受聚煤场陷基底差异沉降及沉积环境所控制（约占９０％），并可用两个对数正态子总体分别描述之；其次为河流冲蚀作用及后期构造变动的影响（约占１０％），且具有在隆起区煤厚变薄尖灭、在场陷区煤层增厚连续的基本规律。
Based on the comprehensive analysis method of environmental parameters, combination of phases, qualitative analysis and quantitative analysis, the author divided the Shanxi section into 4 layers of 19 layers and 42 microfacies in the study area and belonged to the two sedimentary systems of Xiexiang-Tidal Flat and Binhai Delta . The widely distributed environment of II-1 coal deposition is formed by further peat swamping in the overall regression and short-term transgression, the lagoon bay, tidal flat, lagoon bay and marshes; the thickness of II-1 coal seam is mainly due to the differential settlement of the basement of the coal accumulation site and Sedimentary environment (about 90%), and can be described by two logarithmic normals in general. The second is the influence of river erosion and later tectonic movements (about 10%), Thick thin pinch out, the presence of subsidence coal seam thickening continuous basic law.