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    煤炭地下气化地质选区指标体系构建及有利区评价技术

    周贺 吴财芳 蒋秀明 王振至

    周贺, 吴财芳, 蒋秀明, 王振至, 2022. 煤炭地下气化地质选区指标体系构建及有利区评价技术. 地球科学, 47(5): 1777-1790. doi: 10.3799/dqkx.2021.112
    引用本文: 周贺, 吴财芳, 蒋秀明, 王振至, 2022. 煤炭地下气化地质选区指标体系构建及有利区评价技术. 地球科学, 47(5): 1777-1790. doi: 10.3799/dqkx.2021.112
    Zhou He, Wu Caifang, Jiang Xiuming, Wang Zhenzhi, 2022. Construction of Geological Selection Index System and Evaluation Technology of Favorable Area for Underground Coal Gasification. Earth Science, 47(5): 1777-1790. doi: 10.3799/dqkx.2021.112
    Citation: Zhou He, Wu Caifang, Jiang Xiuming, Wang Zhenzhi, 2022. Construction of Geological Selection Index System and Evaluation Technology of Favorable Area for Underground Coal Gasification. Earth Science, 47(5): 1777-1790. doi: 10.3799/dqkx.2021.112

    煤炭地下气化地质选区指标体系构建及有利区评价技术

    doi: 10.3799/dqkx.2021.112
    基金项目: 

    国家自然科学基金项目 41572140

    国家自然科学基金项目 41872170

    国家科技重大专项 2016ZX05044-001

    详细信息
      作者简介:

      周贺(1990-),男,博士,主要从事煤层气和煤炭地下气化的地质综合研究. ORCID:0000-0002-1001-8912. E-mail:zhou977519568@163.com

      通讯作者:

      吴财芳, E-mail: caifangwu@sina.com

    • 中图分类号: P618

    Construction of Geological Selection Index System and Evaluation Technology of Favorable Area for Underground Coal Gasification

    • 摘要: 为厘清影响煤炭地下气化的地质因素,构建科学的地质指标评价体系,对影响煤炭地下气化的七大类地质条件、41个次级地质指标进行了系统分析和分级量化,建立了地质选区指标体系;根据对选区的重要程度,将各地质指标分为基本地质指标(A)和关键地质指标(B)两类,基于这两大类指标,提出了两种新的煤炭地下气化有利区定量评价方法,精细型(A+B)和通用型(B);利用专家打分法和层次分析法确定了这两种评价方法中所涉及到的地质指标权重;依据资源、开采技术、区域构造和环境四大类条件,厘定了评价结果的定性分级方案;综合定量评价和定性分级,提出了有利区优选的一般步骤,最终形成了一套完整的煤炭地下气化有利区评价技术体系.该评价技术体系的有效应用,可为煤炭地下气化科学选址和产业化进程推进提供重要理论支撑.

       

    • 表  1  煤炭地下气化地质选区指标体系

      Table  1.   Geological selection index system of UCG

      序号 类型 亚类 参考指标 指标类型 分类评价级别
      Ⅰ类 Ⅱ类 Ⅲ类 Ⅳ类
      1 煤岩煤质条件U1 煤种U11 中国煤炭分类 B HM CY SM QM FM PM WY JM
      8 7 6 5 4 3 2 1
      2 水分U12 原煤水分含量(%) A 0~15 15~35 35~55 > 55
      3 灰分U13 原煤灰分含量(%) B 0~20 20~35 35~50 > 50
      4 挥发分U14 原煤挥发分含量(%) B 50~37 37~20 20~10 < 10
      5 硫分U15 原煤全硫含量(%) B 0~1.00 1.01~3.00 3.01~4 > 4
      6 反应性U16 1 000度时,对CO2反应性(%) B > 30 20~30 20~10 < 10
      7 黏结性U17 原煤黏结指数(%) B 0~5 5~20 20~45 > 45
      8 煤层赋存条件U2 煤层厚度U21 煤层厚度(m) B 5~15 2.5~5 2~2.5 > 15 m; < 2 m
      B 5~15 2.5~5 0.8~2.5 > 15 m; < 0.8 m
      9 煤层倾角U22 煤层倾角(°) A 35 12~35 35~70 < 12; > 70
      10 煤层埋深U23 煤层埋深(m) B 100~500 500~1 000 1 000~2 000 < 100;
      > 2 000
      11 煤体结构U24 原生煤和碎裂煤所占比重A为评定指标(%) A < 30 30~50 50~70 > 70
      12 煤层结构U25 夹矸厚度系数(%) A < 20 20~30 30~60 > 60
      13 煤层厚度变化U26 煤层厚度变异系数(%) B ≥0.95 0.85~0.95 0.85~0.75 < 0.75
      14 煤炭储量U27 开采年限(a) B > 20 15~20 9~15 < 9
      15 围岩条件U3 顶板渗透性U31 k为渗透率;以lg(k)为计算值 B > 6 4~6 2~4 < 2
      16 底板渗透性U32 k为渗透率;以lg(k)为计算值 B > 6 4~6 2~4 < 2
      17 顶板岩性U33 常见煤层顶底板沉积岩层 A 泥岩

      6
      砂质泥岩
      5
      泥质砂岩
      4
      粉砂岩

      3
      细砂岩

      2
      多孔透水含水砂岩
      1
      18 顶板厚度U34 煤层顶板的厚度(m) B ≥100 100~20 20~15 < 15
      19 构造条件U4 断层U41 断层复杂程度ZG黄温钢,2014 B < 1 1~2 2~3 ≥3
      20 褶皱U42 褶皱复杂程度Ks(%) A ≤70 70~117 117~165 > 165
      21 陷落柱U43 陷落柱影响指数(%) B ≤5 5~15 15~30 > 30
      22 岩浆岩侵入U44 岩浆岩侵入指数(%)(黄温钢,2014 B ≤5 5~15 15~30 > 30
      23 水文条件U5 相对涌水量U51 煤层相对涌水量(m3/t) B < 1 1~2 2~5 > 5
      24 距顶板含水层距离U52 气化煤层距顶板含水层最近距离(m) B > 100 40~100 40~31 < 31
      25 距底板含水层距离U53 气化煤层距底板含水层最近距离(m) B 50 35 20 15
      26 环境条件U6 氟U61 煤中有害元素分级(μg/g) A ≤100 100~200 200~400 > 400
      27 砷U62 煤中有害元素含量分级(μg/g) A ≤4 4~25 25~80 > 80
      28 汞U63 煤中有害元素含量分级(μg/g) A < 0.150 0.150~0.250 0.250~0.600 > 0.600
      29 镉U64 煤中镉含量分级(μg/g) A ≤0.20 0.20~1.00 1.00~10.00 > 10.00
      30 氯U65 煤中有害元素含量分级(μg/g) A ≤0.05 0.05~0.150 0.150~0.300 > 0.300
      31 磷U66 煤中有害元素含量分级(%) A ≤0.010 0.010~0.050 0.050~0.100 > 0.100
      32 空气污染可能程度U67 主要为硫化物和粉尘 B 轻微
      4
      中等
      3
      严重
      2
      极严重
      1
      33 有机物污染可能程度U68 主要为有机物污染问题 B 轻微
      4
      中等
      3
      严重
      2
      极严重
      1
      34 地面塌陷可能程度U69 气化厚煤层时可能出现地面垮落的风险 B 轻微
      4
      中等
      3
      严重
      2
      极严重
      1
      35 其他条件U7 勘查程度U71 预查、普查、详查、勘查 B 勘查
      4
      详查
      3
      普查
      2
      预查
      1
      36 距生产矿井U72 气化炉距生产矿井最近距离(km) B ≥5 5~3.2 3.2~1.6 ≤1.6
      37 距废弃矿井U73 气化炉距废弃矿井最近距离(km) A ≥3 3~1.6 ≤1.6
      38 地形地貌U74 地形地貌特征 A 平原

      8
      低山丘陵
      7
      平坦高原
      6
      低山
      5
      沟壑
      高原
      4
      中山

      3
      高山

      2
      高寒
      高原
      1
      39 交通运输U75 地表交通运输便利程度(km) A 便利
      4
      中等
      3
      一般
      2
      困难
      1
      40 居民区U76 研究区距居民区最近距离 A ≥3 1~3 ≤1
      41 生态保护区U77 视当地政府政策而定 B ≥3 1~3 ≤1
      下载: 导出CSV

      表  2  常用隶属函数

      Table  2.   Common membership functions

      类型 成本型 区间型 效益型
      矩阵型 $ A\left(x\right)=\left\{\begin{array}{l}1, \;\;\;x\le a, \\ 0, \;\;\;x > a, \end{array}\right. $ $ A\left(x\right)=\left\{\begin{array}{l}1, \;\;\;a\le x\le b, \\ 0, \;\;\;x < a, x > b, \end{array}\right. $ $ A\left(x\right)=\left\{\begin{array}{l}1,\;\;\; x\ge a, \\ 0,\;\;\; x < a, \end{array}\right. $
      梯形型 $ A\left(x\right)=\left\{\begin{array}{l}1,\;\;\; x < a, \\ \frac{b-x}{b-a},\;\;\; a\le x\le b, \\ 0, \;\;\;x > b, \end{array}\right. $ $ A\left(x\right)=\left\{\begin{array}{l}\frac{x-a}{b-a}, \;\;\;a\le x < b, \\ 1, \;\;\;b\le x\le c, \\ \frac{d-x}{d-c}, \;\;\;c < x\le d, \\ 0, \;\;\;x < a, x\ge d, \end{array}\right. $ $ A\left(x\right)=\left\{\begin{array}{l}0, \;\;\;x < a, \\ \frac{x-a}{b-a}, \;\;\;a\le x\le b\\ 1,\;\;\; x > b, \end{array}\right., $
      k次抛物型 $ A\left(x\right)=\left\{\begin{array}{l}(1,\;\;\; x < a, \\ {\frac{b-x}{b-a})}^{k}, \;\;\;a\le x\le b\\ 0, \;\;\;x > b, \end{array}\right., $ $ A\left(x\right)=\left\{\begin{array}{l}{\left(\frac{b-x}{b-a}\right)}^{k}, a\le x\le b, \\ 1,\;\;\; b < x\le c, \\ {\left(\frac{b-x}{b-a}\right)}^{k}, \;\;\;c < x\le d, \\ 0, \;\;\;x > d, \end{array}\right. $ $ A\left(x\right)=\left\{\begin{array}{l}(0,\;\;\; x < a, \\ {\frac{b-x}{b-a})}^{k}, \;\;\;a\le x\le b\\ 1, \;\;\;x > b, \end{array}\right., $
      $ \mathrm{\Gamma } $型 $ A\left(x\right)=\left\{\begin{array}{l}1,\;\;\; x\le a, \\ {\mathrm{e}}^{-k(x-a)}, \;\;\;x > a, \end{array}\right. $ $ A\left(x\right)=\left\{\begin{array}{l}{\mathrm{e}}^{k(x-a)},\;\;\; x < a, \\ 1, \;\;\;a\le x\le b\\ {\mathrm{e}}^{-k(x-a)}, \;\;\;x > b, \end{array}\right., $ $ A\left(x\right)=\left\{\begin{array}{l}0, \;\;\;\;\;\;x < a, \\ 1-{\mathrm{e}}^{-k(x-a)}, \;\;\;x\ge a, \end{array}\right. $
      正态型 $ A\left(x\right)=\left\{\begin{array}{l}1, \;\;\;\;\;\;x\le a, \\ \mathrm{e}\mathrm{x}\mathrm{p}\left\{-{\left(\frac{x-a}{\sigma }\right)}^{2}\right\}, \;\;\;x > a, \end{array}\right. $
      $ \sigma > 0, $
      $ A\left(x\right)=\mathrm{e}\mathrm{x}\mathrm{p}\left\{-{\left(\frac{x-a}{\sigma }\right)}^{2}\right\}, $

      $ \sigma > 0, $
      $ A\left(x\right)=\left\{\begin{array}{l}0,\;\;\;\;\;\; x\le a, \\ 1-\mathrm{e}\mathrm{x}\mathrm{p}\left\{-{\left(\frac{x-a}{\sigma }\right)}^{2}\right\},\;\;\; x > a, \end{array}\right. $
      $ \sigma > 0, $
      柯西型 $ A\left(x\right)=\left\{\begin{array}{l}1, \;\;\;\;\;\;x\le a, \\ \frac{1}{1+\alpha {(x-\alpha)}^{\beta }}, \;\;\;x > a, \end{array}\right. $
      $ (\alpha > 0, \beta > 0) $
      $ A\left(x\right)=\frac{1}{1+\alpha {(x-\alpha)}^{\beta }}, $
      $ (\alpha > 0, \beta \mathrm{为}\mathrm{正}\mathrm{偶}\mathrm{数}) $
      $ A\left(x\right)=\left\{\begin{array}{l}0, \;\;\;\;\;\;x\le a, \\ \frac{1}{1+\alpha {(x-\alpha)}^{-\beta }},\;\;\; x > a, \end{array}\right. $
      $ (\alpha > 0, \beta > 0) $
      下载: 导出CSV

      表  3  煤炭地下气化地质指标权重

      Table  3.   Weight of geological indexes of UCG

      序号 类型 权重 精细化评价 通用型评价
      亚类(A+B类,共41个) 权重 亚类(B类,共25个) 权重
      1 煤岩煤质条件
      U1
      0.160 8 煤种U11 0.283 2 煤种U11 0.295 2
      2 水分U12 0.040 7 - -
      3 灰分U13 0.107 0 灰分U12 0.105 0
      4 挥发分U14 0.156 2 挥发分U13 0.162 8
      5 硫分U15 0.133 6 硫分U14 0.139 3
      6 反应性U16 0.155 5 反应性U15 0.162 1
      7 黏结性U17 0.123 8 黏结性U16 0.129 1
      8 煤层赋存条件
      U2
      0.195 0 煤层厚度U21 0.182 9 煤层厚度U21 0.235 5
      9 煤层倾角U22 0.101 2 - -
      10 煤层埋深U23 0.136 2 煤层埋深U22 0.178 8
      11 煤体结构U24 0.081 9 - -
      12 煤层结构U25 0.104 1 - -
      13 煤层厚度变化U26 0.184 5 煤层厚度变化U23 0.276 6
      14 煤炭储量U27 0.209 3 煤炭储量U24 0.309 2
      15 围岩条件
      U3
      0.124 1 顶板渗透性U31 0.233 9 顶板渗透性U31 0.275 1
      16 底板渗透性U32 0.219 2 底板渗透性U32 0.272 5
      17 顶板岩性U33 0.140 6 - -
      18 顶板厚度U34 0.406 4 顶板厚度U34 0.452 4
      19 构造条件
      U4
      0.141 4 断层U41 0.285 2 断层U41 0.320 8
      20 褶皱U42 0.110 9 - -
      21 陷落柱U43 0.331 2 陷落柱U42 0.372 6
      22 岩浆岩侵入U44 0.272 6 岩浆岩侵入U43 0.306 6
      23 水文条件
      U5
      0.147 4 相对涌水量U51 0.388 7 相对涌水量U51 0.388 7
      24 距顶板含水层距离U52 0.490 8 距顶板含水层距离U52 0.490 8
      25 距底板含水层距离U53 0.120 5 距底板含水层距离U53 0.120 5
      26 环境条件
      U6
      0.133 4 氟U61 0.056 5 - -
      27 砷U62 0.056 5 - -
      28 汞U63 0.056 5 - -
      29 镉U64 0.056 5 - -
      30 氯U65 0.056 5 - -
      31 磷U66 0.056 5 - -
      32 空气污染可能程度U67 0.180 0 空气污染可能程度U61 0.164 5
      33 有机物污染可能程度U68 0.272 6 水污染可能程度U62 0.489 3
      34 地面塌陷可能程度U69 0.208 3 地面塌陷可能程度U63 0.346 2
      35 其他条件
      U7
      0.097 9 勘查程度U71 0.184 4 勘查程度U71 0.295 8
      36 距生产矿井U72 0.127 1 距生产矿井U72 0.294 4
      37 距废弃矿井U73 0.098 4 - -
      38 地形地貌U74 0.162 8 - -
      39 交通运输U75 0.025 3 - -
      40 居民区U76 0.201 0 - -
      41 生态保护区U77 0.201 0 生态保护区U73 0.409 9
      下载: 导出CSV

      表  4  煤炭地下气化四大类条件定性评价及分级方案

      Table  4.   Qualitative evaluation and classification scheme of four conditions for UCG

      评价
      指标
      分类评价级别
      资源条件 可气化煤炭资源量分布非常集中,开采年限20年以上.厚煤层和特厚煤层发育,厚度变化稳定,埋深较浅(> 100 m),煤质变化稳定,以褐煤或长焰煤为主. 可气化煤炭资源量集中,开采年限15至20年;中厚和厚煤层发育,厚度变化较稳定,埋深较大;煤质变化稳定,以瘦煤、气煤或肥煤为主. 可气化煤炭资源量一般,开采年限9~15年.中厚煤层发育,煤厚变化一般,埋深较大;煤种以贫煤、无烟煤或焦煤为主. 煤炭资源分布分散,开采年限9年以下.极薄和薄煤层发育,煤厚极不稳定,埋深过浅或过深,煤层分叉严重.
      开采技术条件 水文地质条件简单,煤层上部含水层不发育或距顶板距离非常大,煤层顶底板渗透率低,且不易垮落. 水文地质条件一般,煤层顶板距上部含水层较远,一般不会出现顶板垮落沟通含水层致气化中断的风险. 水文地质条件中等,煤层距上部含水层较近,可能会出现含水层沟通气化炉的事故发生;顶板强度低,厚度不大. 水文地质条件复杂,煤层距含水层非常近,极易出现含水层沟通气化炉的风险;顶板极易垮落.
      区域构造条件 地质构造简单,断层稀少,煤层不受岩浆岩影响,陷落柱不发育. 地质构造一般,断层较发育,有时受岩浆岩影响,陷落柱分布稀少. 地质构造中等,断层发育,或受岩浆岩和陷落柱影响一般. 地质构造复杂,断层、陷落柱非常发育,煤层受岩浆岩侵入严重.
      环境条件 水污染和地面塌陷可能性很低,距地表密集建筑物和生态保护区很远. 水污染和地面塌陷可能性一般,距地表密集建筑物的距离较近. 水和空气污染中等,地面塌陷严重,可能会对周围建筑物存在影响. 水污染和空气污染严重,地面塌陷非常严重,会严重干扰正常的居民生活和交通运输.
      下载: 导出CSV
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