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通过对山西南部晚古生代煤系脉体流体包裹体形成温度、压力、气相和液相成分、稳定同位素组成等地球化学特征的研究，探讨了该区高煤级煤形成的区域古地热场背景．结果表明：该区在燕山中期存在着高热异常古地热场，导致其形成的附加热源可能主要来源于岩浆侵位于地壳不同深度造成的热传导；异常古地热场与正常古地热场背景的叠加，是造成了本区“东高西低、南高北低、高煤级煤展布于东部和南部”的煤级现代分布格局的主要原因．
Based on the study on geochemical characteristics of fluid inclusions in the Late Paleozoic coal-bearing series of the southern Shanxi Province, such as temperature, pressure, gas and liquid composition, and stable isotopic compositions, the background of the paleo-geothermal field in the area was discussed. The results show that there is an anomalous paleotemperature in the mid-Yanshanian, leading to the formation of additional heat sources probably due to the thermal conductivity induced by magmatic intrusion at different depths of the crust. The superposition of the anomalous paleotemperature field and the normal paleotemperature field is Resulting in the main reason for the modern distribution pattern of coal rank of “high in the east and low in the west, low in the south, high in the north, and high in the coal rank in the east and south.”