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鸡西盆地主力煤层水可动性及其孔渗控制

周文宇 王小明 曾凡桂 党正 朱冲 陈文文 王志壮 涂明恺

周文宇, 王小明, 曾凡桂, 党正, 朱冲, 陈文文, 王志壮, 涂明恺. 鸡西盆地主力煤层水可动性及其孔渗控制[J]. 地质科技通报, 2021, 40(3): 124-131. doi: 10.19509/j.cnki.dzkq.2021.0305
引用本文: 周文宇, 王小明, 曾凡桂, 党正, 朱冲, 陈文文, 王志壮, 涂明恺. 鸡西盆地主力煤层水可动性及其孔渗控制[J]. 地质科技通报, 2021, 40(3): 124-131. doi: 10.19509/j.cnki.dzkq.2021.0305
Zhou Wenyu, Wang Xiaoming, Zeng Fangui, Dang Zheng, Zhu Chong, Chen Wenwen, Wang Zhizhuang, Tu Mingkai. Water mobility of the main coal seam and its control of porosity and permeability in Jixi Basin[J]. Bulletin of Geological Science and Technology, 2021, 40(3): 124-131. doi: 10.19509/j.cnki.dzkq.2021.0305
Citation: Zhou Wenyu, Wang Xiaoming, Zeng Fangui, Dang Zheng, Zhu Chong, Chen Wenwen, Wang Zhizhuang, Tu Mingkai. Water mobility of the main coal seam and its control of porosity and permeability in Jixi Basin[J]. Bulletin of Geological Science and Technology, 2021, 40(3): 124-131. doi: 10.19509/j.cnki.dzkq.2021.0305

鸡西盆地主力煤层水可动性及其孔渗控制

doi: 10.19509/j.cnki.dzkq.2021.0305
基金项目: 

国家自然科学基金项目 U1910204

国家自然科学基金项目 41972184

国家自然科学基金项目 41973077

中国地质大学(武汉)学科杰出人才基金项目 102-162301192664

详细信息
    作者简介:

    周文宇(1996-), 男, 现正攻读矿产普查与勘探硕士学位, 主要从事煤层气勘探与开发方面研究工作。E-mail: 1521789743@qq.com

    通讯作者:

    王小明(1978-), 男, 副教授, 主要从事煤层气地质学、煤层气勘探与开发方面研究工作。E-mail: sunwxm@cug.edu.cn

  • 中图分类号: P618.13

Water mobility of the main coal seam and its control of porosity and permeability in Jixi Basin

  • 摘要: 水可动性是影响煤层气产出的重要因素,分析孔渗对水可动性的作用对鸡西盆地煤层气开发具有重要意义。以鸡西盆地不同矿区主力煤层为研究对象,开展了低场核磁共振(NMR)及渗透率实验,同时,结合称重测定煤样含水饱和度的方法,分析了煤层孔渗特征对煤中水可动性的影响。结果表明:①研究区煤样中吸附孔较为发育,平均占比为58.36%;渗流孔和裂隙发育程度相当,平均占比分别为21.23%和20.41%,且两者之间连通性较好;②确定了煤样达到束缚水状态的离心力为1.38 MPa,此压力下煤中可排出半径约0.1 μm半开放或开放孔隙中的可动水。煤样可动水饱和度为27.84%~60.87%,平均值37.86%;束缚水饱和度为39.13%~72.16%,平均值62.14%,可动水含量相对束缚水含量较低。随着离心压力的增加,可动水首先沿着大裂隙流动,随后经过渗流孔流出,束缚水主要存在于吸附孔中,需要克服较大的毛细管阻力,难以流动;③尽管煤样变质程度相近,但其内部水的可动性及赋存状态存在明显差异,这可能是造成同一区块不同煤层气井气水产出差异的原因之一;④研究区煤中半径>1 000 nm段孔喉越发育、煤岩渗透率越大,煤的可动水饱和度越高,水在其中越容易流出;煤中半径0~100 nm段孔喉越发育,煤的可动水饱和度越低,水在其中被束缚而难以流动。

     

  • 图 1  采点位置及研究区构造纲要图

    Figure 1.  Mining point location and structural outline map of the study area

    图 2  煤样在不同离心力下的含水饱和度

    Figure 2.  Water saturation of coal samples under different centrifugal force

    图 3  样品NMR特征

    Figure 3.  NMR characteristics of samples

    图 4  孔喉体积分数与可动水饱和度的关系

    Figure 4.  Relationship between pore throat content and mobile water saturation

    图 5  气测渗透率与可动水饱和度、束缚水饱和度的关系

    Figure 5.  Relationship between gas permeability and mobile water and irreducible water saturation

    表  1  样品基本测试结果

    Table  1.   Basic testing results of samples

    样品号 所采矿区 Ro,max Mad Ad Vdaf FCad 气测渗透率/10-3μm2
    φB/%
    CSH-3 城山矿 1.063 1.01 28.82 14.49 55.68 0.066 2
    CSH-36 城山矿 1.162 1.45 30.32 8.29 59.94 0.148 3
    DH-23 东海矿 0.908 1.62 28.06 8.37 61.95 0.077 1
    PG-14 平岗矿 1.181 0.90 21.07 10.22 67.81 0.085 5
    XH-48 杏花矿 1.569 0.92 18.46 10.65 69.97 0.063 8
    XH-54 杏花矿 1.734 0.66 17.30 12.79 66.28 0.096 1
    注:测试单位为中国地质大学(武汉)构造与油气资源教育部重点实验室;Ro,max为最大镜质体反射率;Mad为水分(空气干燥基);Ad为灰分(干燥基);Vdaf为挥发分(干燥无灰基);FCad为固定碳(空气干燥基)
    下载: 导出CSV

    表  2  样品NMR基本参数

    Table  2.   Basic NMR parameters of samples

    样品号 T2c/ms 核磁
    孔隙度/
    %
    可动水
    饱和度/
    %
    束缚水
    饱和度/
    %
    孔体积分数φB/% 孔喉体积分数/%
    吸附孔 渗流孔 裂隙 半径 < 10 nm
    (T2 < 0.5 ms)
    半径[10, 10]
    nm, T2[0.5, 5 ms)
    半径[100, 1 000]
    nm, T2[5, 50 ms)
    半径>1 000 nm
    (T2>50 ms)
    CSH-3 12.33 0.32 27.84 72.16 69.57 19.43 11.00 39.39 28.64 16.01 15.96
    CSH-36 24.77 0.30 60.87 39.13 34.21 20.93 44.86 22.98 9.81 12.37 54.84
    DH-23 14.17 0.69 31.78 68.22 64.86 22.34 12.80 26.59 33.23 20.66 19.52
    PG-14 6.14 0.27 43.61 56.39 50.16 19.29 30.55 38.70 10.51 13.96 36.82
    XH-48 1.75 0.39 29.33 70.67 77.97 15.86 6.18 43.59 31.87 14.55 9.99
    XH-54 28.48 0.97 33.75 66.25 53.39 29.53 17.08 19.41 27.37 27.08 26.14
    注:测试单位为太原理工大学煤与煤系气地质山西省重点实验室;T2cT2截止值
    下载: 导出CSV
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