两淮煤田大地热流分布及其构造控制

doi:10.6038/cjg20150716

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摘要基于127块煤系地层岩石样品的热导率测定结果,并结合59个井田内可靠的系统测温数据,计算得出两淮煤田的大地热流值,并编制大地热流分布图,其结果表明:两淮煤田大地热流值变化范围为29.7~83.9 mW·m^-2,平均值为58.3 mW·m^-2,和其他沉积盆地存在一定的差异,且淮南煤田大地热流值(63.7 mW·m^-2)远大于淮北煤田(55.2 mW·m^-2).综合分析得出,两淮煤田大地热流与其他盆地的差异以及淮南煤田热流值高于淮北煤田的现象为构造演化和区域地质背景的控制结果;而研究区内热流的分布不均主要是由于受地质构造对地温场的影响所致,推覆构造上下盘现今热流值的差异尤为突出.

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关键词 ：两淮煤田, 热导率, 大地热流, 构造控制

Abstract：The terrestrial heat flow value is an important parameter to characterize the geothermal field in a region precisely. For the Huainan-Huaibei coalfield, the data of geothermal distribution, thermo-physical tests of rock and the distribution of terrestrial heat flow remain very little. To solve this problem, we use reliable well-logging data of temperature to delineate the distribution characteristics of terrestrial heat flow and analyze the influence of geological structure on current distribution of heat flow in this area.The determination of heat flow values depends on reliable well-logging data and test results of thermal conductivity of rock. Data from 159 boreholes for measuring temperature in steady state with long quiescent time in 59 coal mines or exploitation areas have been used to compute the geothermal gradients. The thermal conductivity values of 127 rock samples were measured, which were collected from 12 boreholes of 6 coal mines. Data of terrestrial heat flow at 37 sites of steady state for approximate temperature testing and 22 sites for simple temperature testing have been acquired and the distribution map of terrestrial heat flow of the Huainan-Huaibei coalfield has been prepared.The results show that the minimum terrestrial heat flow is 29.7 mW·m^-2, and the maximum is 83.9 mW·m^-2,mostly between 50 mW·m^-2 and 70 mW·m^-2, with average 58.3 mW·m^-2. On the whole, the terrestrial heat flow value of Huainan coalfield is higher than that in Huaibei coalfield. The abnormal area of high values in the Huainan coalfield is large. The values in the mid-east area are the highest, while those in the west are the secondary, and the southeast is the lowest. The heat flow values in the south and west are high while that in the east is low in the Huaibei coalfield. The distribution characteristics of current terrestrial heat flow in Huainan-Huaibei coalfield are mainly controlled by evolution of tectonics of the North China plate and regional geological background. The big differences of heat flow value between Huainan and Huaibei coalfields are the result of the influence of the distance to the plate boundary and the late crust uplift. The asymmetry of heat flow in the study area is mainly resulted from the influence of geological structure on the geothermal field, and the core of the anticline and deep and large extensive faults are usually the areas with high heat flow values, while the upper walls of the Fufeng and Xusu nappes have low heat flow values.

Key words： Huainan-Huaibei Coalfield Thermal conductivity Heat flow Structural control

收稿日期: 2014-01-20

PACS:

P314

基金资助:国家自然科学基金项目(41272278),安徽省国土资源科技项目(2011-K-13),高等学校博士学科点专项科研基金(20123415110002)资助.

作者简介: 彭涛,男,1988年生,博士,研究方向为地热地质与矿井地质. E-mail:512022882@qq.com

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http://www.geophy.cn/CN/10.6038/cjg20150716 或 http://www.geophy.cn/CN/Y2015/V58/I7/2391

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