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基于淮北煤田中南部的现今地温场分析和所测定的62块样品的热导率,计算了研究区的大地热流值,并绘制了大地热流分布图.结果表明,淮北煤田中南部平均大地热流值约为60mW/m2,与同处华北板块的其他主要能源盆地相比有所差异,而与研究区所处的区域地质构造及深部地质背景密切相关.大地热流分布总体具有东南、中部、西北相对偏高,而东北、西南相对偏低的特点.通过对研究区二叠系煤系地层埋藏深度和温度计算,绘制了二叠系煤系地层底界面的温度分布图,以此将二叠系煤系地层的温度条件、煤层样品的镜质组反射率、煤变质程度以及研究区构造-埋藏演化史等相结合,从地温场的角度出发探讨了淮北煤田中南部二叠系煤层现今可能所处的生气状态.研究表明,淮北煤田二叠系煤系地层较低的现今地温、较高的镜质组反射率、煤级以中高变质煤为主以及煤系沉积后的构造演化等,都比较适合次生生物成因气的生成,而与热成因气、原生生物成因气的生存条件不吻合.
Based on the present geothermal field analysis in central and southern part of Huaibei Coalfield and the measured thermal conductivity of 62 samples, the geothermal heat flow in the study area was calculated and the geothermal heat flux distribution map was plotted. The results show that the average geothermal flow in central and southern Huaibei coalfield About 60mW / m2, which is different from other main energy basins in the same area of North China Plate, but closely related to the regional geological structure and deep geological background in the study area.The distribution of the geothermal heat flux in the whole area is relatively southeast, middle and northwest But relatively low in the northeast and southwest.The temperature distribution map of the bottom interface of the Permian coal measures is drawn by calculating the burial depth and temperature of the Permian coal measures strata in the study area so that the Permian Coal seam strata temperature conditions, the vitrinite reflectance of coal seam samples, coal metamorphism degree and the tectonic-burial evolution history of the study area are combined to discuss the possibility of Permian coal seams in the middle and southern parts of Huaibei coalfield from the perspective of geothermal field The research shows that the present geothermal temperature of the Permian coal measures in Huaibei coalfield is lower, the vitrinite reflectance is higher, the coal grade is dominated by medium-high metamorphic coal and coal After deposition structure evolution, are more adapted to generate secondary biogenic gases, with the thermogenic gas, primary gas biogenic living conditions do not match.