| 深部泥岩渗透率测试方法及数据适用性分析 |
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| 引用本文： | 刘伟,李银平,杨春和,马洪岭,施锡林,黄小兰.深部泥岩渗透率测试方法及数据适用性分析[J].岩土力学,2014,35(Z1):85-90. |
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| 作者姓名： | 刘伟 李银平 杨春和 马洪岭 施锡林 黄小兰 |
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| 作者单位： | 1. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室，武汉 430071；2. 武汉轻工大学 多孔介质力学研究所，武汉 430023 |
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| 基金项目： | 国家自然科学基金资助(No.51274187)；国家自然科学青年基金资助(No.51104108，No.51304187)。 |
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| 摘 要： | 针对深部地层同一种泥岩,先后采用常规渗透测试、变围压渗透测试和三轴压缩下瞬态法3种方法开展渗透率的测试研究。试验发现,3种方法下泥岩的渗透率差别极大,其中常规渗透测试所得的渗透率高出后两种方法 35个数量级;变围压法在围压大于5 MPa后与三轴压缩下的瞬态法所测得的渗透率值较为接近;瞬态法下泥岩渗透率随偏应力增加而缓慢降低,偏应力高达30 MPa时仍未出现扩容现象。测试显示泥岩的渗透率具有强烈的压力敏感性,其内在原因是较高围压下裂隙闭合、孔隙压紧、孔喉连通性减小,进而导致渗透率下降,而制样、烘干处理等对渗透率也有一定影响。基于试验结果与泥岩所处实际地层应力状态,提出可采用变围压法开展油气储集层的盖层的渗透率及其演化规律研究,而三轴压缩下瞬态法则更适用于能源储库盖层及核废料处置室围岩的渗透规律研究;常规渗透方法所得数据的应用则须商榷。研究结论对研究深部泥岩的渗透特性和密封性能有一定参考价值。
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| 关 键 词： | 泥岩 渗透率 围压 压力敏感性 偏应力 |
| 收稿时间： | 2013-10-16 |
Methods for testing permeability of deep mudstone and analysis of data reliability of each method |
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| LIU Wei
,
LI Yin-ping
,
ANG Chun-he
,
MA Hong-ling
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SHI Xi-lin
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HUANG Xiao-lan.Methods for testing permeability of deep mudstone and analysis of data reliability of each method[J].Rock and Soil Mechanics,2014,35(Z1):85-90. |
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| Authors: | LIU Wei LI Yin-ping ANG Chun-he MA Hong-ling SHI Xi-lin HUANG Xiao-lan |
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| Institution: | 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. Institute of Poromechanics, Wuhan Polytechnic University, Wuhan 430023, China |
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| Abstract: | For the same deep mudstone, three testing methods of permeability (conventional testing method, variable confining pressure method, and pulse method under triaxial compression) have been conducted respectively. According to the testing results, large difference of permeability was found inbetween the three methods, in which the permeability of conventional method is 3-5 orders higher than those of the other two methods. The results of variable confining pressures method while its confining pressure exceeds about 5 MPa approach relatively the results of pulse method under triaxial compression. Permeability of pulse method slowly decreased with the increasing of deviatoric pressure, and dilatancy didn’t occur even when confining pressure reached 30 MPa. The results indicate that the permeability of mudstone is strongly sensitive to pressure; the intrinsic reason of which is that the cracks, fissures and pores in rock matrix tend to be compacted under high compression, which results in the reduction of pore size and connectivity for percolation channels and then causes the permeability to decrease; moreover, samples production, oven drying treatment, etc. also influence some of the permeability. Based on the results and the in-situ stresses conditions of mudstone, it is proposed that the variable confining method is suitable for the permeability and its development of reservoirs’ cap rock, while the results of pulse method under triaxial compression is more suitable for the cap rock of energy storage caverns and rock wall of wastes disposals. However, one should be very cautious while uses the results from conventional method. The research carried out supplies some constructive references for the analysis of the percolation properties and sealability of mudstone in deep strata. |
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| Keywords: | mudstone permeability confining pressure pressure sensibility deviatoric stress |
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