黏土配比对人工砂岩渗透率影响规律的实验研究

doi:10.13722/j.cnki.jrme.2016.1540

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摘要

黏土是影响砂岩渗透率的重要因素，研究不同黏土含量砂岩的渗透规律对工程的安全与效益具有重要意义。由于天然岩样成分复杂，岩性差异较大，为了研究黏土含量在围压加卸载条件下对疏松泥质砂岩气体渗流规律的影响，制作不同黏土(蒙脱石与伊利石)与石英砂配比的人工岩样，采用TOP实验机进行相同应力路径下的围压加卸载气体渗流实验。实验使用氮气作为渗流流体，在渗透压力1 MPa，轴压1 MPa，围压加卸载路径为4，6，8，10，12，15，12，10，8，6，4 MPa的应力条件下，得到不同黏土含量的人工岩样力学性质及渗透率随围压变化的规律。结合达西定律与泊肃叶渗透模型，建立不同黏土含量的人工岩样的渗透率围压关系模型。研究结果表明，所制人工岩样的黏土含量及孔隙度与其初始渗透率满足Boltzmann函数。岩样黏土含量较低时其应力–应变关系表现为线性特征，渗透率与围压满足幂律型关系；黏土含量较高时应力–应变关系表现为非线性特性，渗透率与围压满足负指数型关系。围压的压密作用能够使岩样的应力–应变关系向线性变化，表现为渗透率与围压从负指数关系向幂律关系转化。岩样中黏土含量的增高，使得内部结构强度减弱，在应力作用下更容易产生使渗透率增大的贯通裂隙。

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	赵阳
	周宏伟
	钟江城
	王睿

关键词 ：岩石力学, 人工砂岩, 黏土配比, 围压加卸载, 渗流实验, 渗透率模型

Abstract：

Clay is the important factors influencing the permeability of sandstone. Studying the permeability of different clay content in sandstone is of great significance to the safety and effectiveness of the engineering. Due to the complexity and lithologic differences of natural rock composition，the effect that proportioning of clay may have on gas permeation flow behavior in loose manufactured clayey sandstones was studied during the applying and relieving of confining pressure. Make some artificial rock samples with different clay-quartz sand proportions. The artificial aggregate was quartz sand of a size between 70–140(sieve opening，the number of sieve meshes per inch) and the clay was montmorillonite and illite. A gas permeation flow test including an application and a relieving stage of confining pressure was conducted on a TOP testing machine using the same stress path. The test permeation gas was nitrogen. The permeation pressure was 1 MPa，the axial pressure 1 MPa；and the applying and relieving path of the confining pressure was 4，6，8，10，12，15，12，10，8，6，and 4 MPa. The regular of gas permeability variation as a function of confining pressure and the mechanical property in artificial rock samples，made of different clay contents，was found. Combining with the Darcy¢s law and Poiseuille penetration model，the permeability-confining pressure model that based on artificial stone with different clay content was built. The findings suggest that in term of article sample rocks both clay content or porosity and initial permeability satisfy Boltzmann function. The stress-strain relationship can be regarded as linear model when the clay content is low. And can be regarded as nonlinear model when clay content is high. The permeability-confining pressure relation changes from a power law relation to a negative exponential one as clay content increases. Compaction of confining pressure can make the stress-strain relationship change to the linear model. Characterized by permeability-confining pressure changes from the negative exponent relationship to power law relationship，higher the clay content in the sample，reduces the strength of the internal structure. Transfixion cracks are easier to produce under stress and increase permeability.

Key words： rock mechanics artificial sandstone clay proportion loading-unloading confining pressure seepage experiment permeability model

引用本文:

赵阳，周宏伟，钟江城，王睿. 黏土配比对人工砂岩渗透率影响规律的实验研究[J]. 岩石力学与工程学报, 2018, 37(S1): 3253-3262.
ZHAO Yang，ZHOU Hongwei，ZHONG Jiangcheng，WANG Rui. An experimental study on artificial sandstone-clay proportioning on permeation behavior. , 2018, 37(S1): 3253-3262.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2016.1540 或 https://rockmech.whrsm.ac.cn/CN/Y2018/V37/IS1/3253

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