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首页> 外文期刊>Journal of Petroleum Science & Engineering >Structural and evolutionary characteristics of pores-microfractures and their influence on coalbed methane exploitation in high-rank brittle tectonically deformed coals of the Yangquan mining area, northeastern Qinshui basin, China
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Structural and evolutionary characteristics of pores-microfractures and their influence on coalbed methane exploitation in high-rank brittle tectonically deformed coals of the Yangquan mining area, northeastern Qinshui basin, China

机译：孔泉矿区阳泉矿区高级脆性构造变形煤矿微磨削结构和进化特征及其对煤层气开采的影响。

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摘要

The Yangquan mining area is an important anthracite production base in China, but various types of tectonically deformed coals (TDCs) are well developed in its mines and gas outburst accidents take place frequently. By using methods such as optical microscope observation, mercury intrusion porosimetry (MIP) and low pressure nitrogen/carbon dioxide gas adsorption (LP-N-2/CO(2)GA), we tested the structural and evolutionary characteristics of pores-microfractures and their influence on coalbed methane exploitation in high-rank (R-o,R-max = 2.00-2.72%) primary structure coals and brittle TDCs (i.e., cataclastic-, mortor-, and granulitic coals) from the Yangquan mining area. The results show that the tectonic deformation can change the pore-microfracture structure of coals and, thus, their reservoir physical properties. In general, with the enhancement of tectonic deformation, the density of microfractures in coal, which become more and more mussy, gradually increases, the total pore volume (TPV) of coal (pores with a diameter of 5.37-27000 nm) and the pore volume of each pore size range increase, with the greatest increase occurring in pores of 100-1000 nm, and the connectivity between pores is gradually reduced as well. From primary structure coals to granulitic coals, the TPV by the Barret-JoynerHalenda (BJH) model increases with a greater increase in mesopores, and the specific surface area (SSA) by the Brunauer-Emmett-Teller (BET) model shows a trend of "increase-decrease-increase", while the average pore diameter changes follow the pattern of "decrease-increase-decrease" in 0.7-206 nm. However, tectonic deformation has little effect on micropores with a diameter of less than 1 nm in brittle TDCs. The difference in pore-microfracture structures of different brittle TDCs indicates that the cataclastic coals distribution area is favorable for coalbed methane (CBM) exploitation, while the granulitic coals distribution area is a gas outburst-prone area.
机译：阳泉矿区是中国重要的无烟煤生产基地，但各种类型的根本变形煤（TDC）在其矿山和瓦斯突发事故中经常发生。通过使用诸如光学显微镜观察，汞侵入孔隙瘤（MIP）和低压氮/二氧化碳气体吸附（LP-N-2 / CO（2）GA）的方法，我们测试了孔隙微磨术的结构和进化特性它们对高级（RO，R-MAX = 2.00-2.72％）的煤层气剥削的影响来自阳泉矿区的初级结构煤和脆性TDC（即Cataclastic-，肉质煤）。结果表明，构造变形可以改变煤的孔隙微膛结构，从而改变它们的储层物理性质。一般来说，随着构造变形的提高，煤中的微裂缝密度变得越来越多的味道，逐渐增加，煤的总孔体积（TPV）（毛孔，直径为5.37-27000nm）和孔每个孔径范围的体积增加，毛孔中最大的增加100-1000nm，孔之间的连接也逐渐减小。从初级结构煤到粒化煤中，Barret-Joynerhalenda（BJH）模型的TPV随着中孔的增加而增加，Brunauer-emmett-Teller（Bet）模型的特定表面积（SSA）显示出趋势“增加 - 减少 - 增加”，而平均孔径变化遵循0.7-206nm中的“减少减少”的模式。然而，构造变形对微孔的影响几乎没有脆弱TDC直径小于1nm的微孔。不同脆性TDC的孔隙微膛结构差异表明，砂砾甲烷（CBM）剥削的催化煤煤层易用，而粒状煤炭分布区域是气体突出易患区域。

著录项

  • 来源
  • 作者

    Li Fengli; Jiang Bo; Cheng Guoxi; Song Yu; Tang Zheng;

  • 作者单位

    China Univ Min &

    Technol Key Lab Coalbed Methane Resource &

    Reservoir Form Minist Educ Xuzhou 221116 Jiangsu Peoples R China;

    China Univ Min &

    Technol Key Lab Coalbed Methane Resource &

    Reservoir Form Minist Educ Xuzhou 221116 Jiangsu Peoples R China;

    China Univ Min &

    Technol Key Lab Coalbed Methane Resource &

    Reservoir Form Minist Educ Xuzhou 221116 Jiangsu Peoples R China;

    China Univ Min &

    Technol Key Lab Coalbed Methane Resource &

    Reservoir Form Minist Educ Xuzhou 221116 Jiangsu Peoples R China;

    China Univ Min &

    Technol Key Lab Coalbed Methane Resource &

    Reservoir Form Minist Educ Xuzhou 221116 Jiangsu Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 石油、天然气工业;
  • 关键词

    Brittle TDCs; Microfracture; Pore; CBM exploitation;

    机译：脆性TDC;微折痕;孔隙;CBM剥削;

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