Distribution Characteristics of Current Geothermal Field and Terrestrial Heat Flow in Huaibei Coalfield
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摘要: 淮北煤田的高温热害问题愈发突出,但目前对该区系统的地温场特征及大地热流分布研究非常稀少.在系统分析淮北煤田大量地面钻孔井温测井数据和井下巷道围岩温度测试数据的基础上,结合72块岩石样品的热导率测试结果,全面阐述了该区现今地温梯度和大地热流的分布特征.研究表明:淮北煤田现今地温梯度众值介于1.80~2.80 ℃/100 m之间,平均地温梯度为2.42 ℃/100 m;大地热流值变化范围为39.52~74.12 mW/m2,平均热流值为55.72 mW/m2,地温梯度和热流值均低于同处华北板块的其他盆地以及南部的淮南煤田;大地热流受地温梯度控制明显,两者分布较为相似,整体表现为南高北低、西高东低的特点.结果表明,区内现今地温场和热流分布主要受区域地质背景和区内构造格局的控制.Abstract: The problem of high temperature in Huaibei coalfield is going to be more and more terrible, however, the research on the characteristics of geothermal field and the distribution of terrestrial heat flow in this region is extremely rare. On the basis of systematical analysis of temperature logging data of surface boreholes and the tested data of temperature of surrounding rock of underground roadway in Huaibei coalfield, combining the tested results of thermal conductivity of 72 rock samples, the current geothermal gradient and terrestrial heat flow in this region are comprehensively expounded. The study shows that the mode of current geothermal gradient in Huaibei coalfield is between 1.80 and 2.80 ℃/100 m and the average is 2.42 ℃/100 m. The terrestrial heat flow value ranges from 39.52 to 74.12 mW/m2 and the average is 55.72 mW/m2. The geothermal gradient and the terrestrial heat flow value are lower than those in Huainan coalfield and other basins in North China. Terrestrial heat flow is controlled by geothermal gradient obviously. The variation of geothermal distribution is similar to the distribution of geothermal gradient and it shows as a whole that the temperature in the south is higher than that in the north and the temperature in the west is also higher than that in the east. The analysis shows that the distribution of current geothermal field and heat flow in the region is mainly controlled by regional geological background and regional tectonic framework.
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Key words:
- geothermal fields /
- geothermal gradient /
- terrestrial heat flow /
- structural control /
- Huaibei coalfield
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表 1 井下测温结果
Table 1. The results of underground temperature
煤矿 测点位置 标高(m) 温度(℃) 平均地温梯度(℃/100 m) 地面钻孔平均地温梯度(℃/100 m) 芦岭矿 Ⅲ1轨道下山巷道不同位置 -650.0 28.1 2.32 2.24 -750.0 30.2 -800.0 31.3 -869.4 33.1 朱仙庄矿 Ⅱ851岩轨巷 -442.0 27.4 2.41 2.46 Ⅱ833岩轨巷 -558.0 30.4 Ⅱ5行人上山 -678.0 33.0 二水平回风上山 -324.0 24.6 87总回风副巷 -272.0 23.4 石台矿 2511风巷 -352.0 20.8 1.30 无测温孔 23120切眼 -473.0 22.8 刘桥一矿 Ⅱ66风巷距迎头20 m处 -740.0 28.1 1.50 1.80 810岩巷距迎头45 m处 -810.0 28.8 表 2 岩石热导率测试结果汇总
Table 2. The summary table of the tested results of rock thermal conductivity
煤矿 孔号 采样深度(m) 岩性(样品数(个)) 平均热导率(W/(m·K)) 卧龙湖 W6-2 881~1 026 泥岩(1) 2.36 砂岩(2) 2.62 岩浆岩(1) 2.49 孙疃 副检 222~1 183 泥岩(7) 2.17 砂岩(15) 2.51 祁东深部 27-28S7 733~1 233 泥岩(4) 2.28 砂岩(4) 2.79 任楼 46(Ⅰ)5 890~915 泥岩(7) 2.33 42-43-11 1 005~1 010 46(Ⅱ)4 1 021~1 023 砂岩(10) 3.30 42-43-12 1 057~1 071 46-47-15 1 210~1 230 煤(1) 0.88 46-47-13 1 070~1 208 杨庄 2013-2 90~394 泥岩(8) 1.99 砂岩(9) 2.64 表 3 淮北煤田大地热流值汇总
Table 3. The heat flow database of Huainan coalfield
孔号/井田 东经 北纬 计算段范围(m) 地温梯度(℃/100 m) 砂岩所占比例(%) 泥岩所占比例(%) 煤所占比例(%) 岩浆岩所占比例(%) 加权平均热导率(W/(m·K)) 大地热流值(mW/m2) 朱仙庄09-4★ 117°8′37″ 33°34′56″ 238~958 1.92 31.30 62.70 3.44 2.25 43.26 龙王庙北47-48-2★ 117°9′24″ 33°28′19″ 231~967 2.02 46.20 52.10 1.70 2.42 48.80 龙王庙南40-5★ 117°9′18″ 33°26′4″ 301~793 1.91 43.79 53.78 2.43 2.39 45.67 芦岭L4 117°12′23″ 33°32′16″ 201~1 160 1.74 53.59 42.50 3.91 2.42 42.03 祁南深部Q12-4 117°0′52″ 33°28′4″ 221~1 163 2.56 44.60 51.20 1.11 2.35 60.16 骑路孙5-4★ 116°59′28″ 33°33′29″ 216~694 2.52 49.60 47.20 2.30 2.40 60.56 钱营孜30-5 116°53′24″ 33°29′24″ 231~1 002 1.89 27.20 66.90 2.28 2.23 42.13 邹庄24-252★ 116°52′20″ 33°27′51″ 236~1 000 1.90 30.10 65.10 3.08 2.27 43.17 祁东深部29-4★ 117°4′44″ 33°23′53″ 430~806 2.80 51.20 43.80 2.95 2.37 66.49 祁东25-10★ 117°4′53″ 33°25′40″ 366~758 2.60 48.91 49.13 1.96 2.43 63.06 祁南18-8 117°0′44″ 33°24′53″ 380~816 2.70 53.21 45.18 1.61 2.45 66.24 五沟J1-4★ 116°37′39″ 33°33′9″ 270~741 2.55 49.89 47.61 2.50 2.42 61.73 张油坊3-9★ 116°39′0″ 33°34′48″ 280~1 175 2.28 48.50 48.30 1.25 2.39 54.55 赵集2-1 116°47′12″ 33°25′15″ 336~1 000 2.54 43.30 51.80 1.89 2.33 59.22 许疃67-19★ 116°43′49″ 33°24′57″ 359~750 2.70 38.74 54.40 6.86 2.29 61.78 邵于庄65-10 116°44′7″ 33°25′44″ 319~801 2.50 48.56 50.01 1.43 2.43 60.82 孙疃26-13★ 116°45′33″ 33°33′27″ 189~882 2.51 56.32 37.61 6.07 2.39 60.03 孙疃深部16-S2 116°47′3″ 33°36′5″ 172~1 222 2.59 52.19 43.87 3.94 2.41 62.36 杨柳04-16★ 116°45′17″ 33°38′35″ 142~672 2.40 51.89 46.50 1.61 2.45 58.72 任楼45-46-3 116°45′48″ 33°28′13″ 240~618 2.70 42.10 53.80 4.10 2.35 63.54 临涣2-3B3★ 116°39′18″ 33°39′50″ 178~605 2.38 36.79 61.87 1.34 2.37 56.51 海孜21-B2 116°36′35″ 33°40′6″ 233~780 2.02 46.80 51.38 1.82 2.42 48.82 青东9-106 116°31′4″ 33°39′5″ 239~721 2.28 56.81 40.89 2.30 2.46 56.08 袁一06-7★ 116°33′37″ 33°33′36″ 249~702 2.48 34.17 60.82 5.01 2.30 56.97 袁二04-22★ 116°27′2″ 33°31′23″ 262~962 2.11 46.17 50.21 3.62 2.38 50.27 大段家16-2★ 116°25′3″ 33°38′2″ 237~1 166 2.13 35.52 63.40 1.08 2.37 50.53 杨潘楼2-4★ 116°16′9″ 33°34′53″ 247~519 2.40 45.67 49.04 5.29 2.35 56.42 信湖22-7 116°7′60″ 33°28′34″ 438~1 262 2.70 23.02 75.32 0.64 2.29 61.93 刘店04-26 116°13′56″ 33°36′33″ 353~655 2.40 43.32 56.68 0.00 2.43 58.34 徐广楼33-6★ 116°18′26″ 33°30′11″ 286~526 2.70 47.62 50.18 2.20 2.41 65.19 花沟西25-9★ 115°56′58″ 33°27′25″ 686~1 301 3.00 34.97 60.36 2.07 2.59 2.34 70.26 卧龙湖B1-4 116°28′60″ 33°50′22″ 224~770 3.00 51.28 47.07 1.65 2.44 73.29 黄集1-3 116°35′17″ 33°53′36″ 185~737 3.01 57.49 40.17 2.34 2.46 74.12 火神庙10-3 116°39′24″ 33°52′33″ 119~678 1.79 38.21 58.47 2.12 1.20 2.34 41.88 梁花园6-7-2★ 116°43′25″ 33°55′10″ 104~630 1.69 50.74 48.41 0.85 2.45 41.40 刘一Ⅱ6 116°40′12″ 33°55′31″ 121~601 1.80 43.48 52.84 3.68 2.37 42.62 刘桥深部20-2★ 116°42′1″ 33°59′15″ 162~1 046 2.08 38.17 58.86 2.93 2.35 48.94 杨庄83-6 116°48′39″ 33°55′16″ 91~800 1.6 56.32 42.18 1.50 2.47 39.52 注:★号为近似稳态孔. -
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