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【目的】为了认识红层砂岩在加载过程中渗透率演化特征，【方法】通过声发射、核磁共振、渗透试验对贵州赤水红层砂岩加载过程中孔隙和渗透率的演化过程进行了研究，讨论了孔隙分形维数、孔隙率与渗透率之间的关系。【结果】结果显示：砂岩的小孔占总孔隙的33%～37%,大孔占总孔隙的64%～68%;经历多次加载梯度后，砂岩试样S-3、S-4、S-5的渗透率最终分别降低至初始渗透率的71%、63%、54%。【结论】结果表明：砂岩的渗透率在加载全过程中随应力的增加呈线性降低，孔隙率变化表现出明显的阶段性，孔隙压密阶段孔隙率降低，弹性阶段初期孔隙率回升后随应力增长而降低，非稳定破裂阶段孔隙率增大；砂岩的核磁共振T2谱图呈双峰特征，在试样破坏前，大孔径孔隙比例降低，小孔径孔隙比例升高。NMR大孔分形维数Dfl与渗透率线性相关性强；核磁共振成像结果(MRI)可显示砂岩在不同加载阶段内部微孔洞和微裂隙的演化过程，通过对砂岩核磁共振图像处理，可获得不同应力加载过程砂岩孔隙演化规律。
Abstract：[Objective] In order to understand the permeability evolution characteristics of the red-bed sandstone in Chishui of Guizhou Province during loading process, [Methods] the evolutions of pore and permeability of the sandstone during loading process are studied herein through the relevant acoustic emission test, nuclear magnetic resonance(NMR) test, permeability test, and then the pore fractal dimension and the relationship between porosity and permeability are discussed. [Results] The small pore and large pore of sandstone accounted for 33%～37%, 64%～68% respectively. Samples S-3, S-4 and S-5 decreased to 71%,63%,54% of original permeabilities after a serious of loading step by step. [Conclusion] The above implementation fully demonstrates the permeability of the sandstone linearly decreases with the increase of stress during the whole loading process, while the porosity changes with obvious stages, that is to say, the porosity decreases during pore compaction stage and rebounds at first and then decreases with the increase of stress in the early elastic stage. Moreover, the porosity increases in the unsteady fracture stage. The NMR T2 spectrum of sandstone exhibits a bimodal character, while the proportion of large pore decreases and that of the small pore increases before the failure of sample. The NMR fractal dimension Dfl of large pore has a strong linear correlation with permeability. The evolution processes of the internal micropore and microcrack in sandstone at different loading stages can be displayed by the results of nuclear magnetic resonance imaging(NMRI), and then the evolution laws of sandstone pore during different stress loading processes can be obtained through the processing of the NMRI image of sandstone.
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基本信息:
DOI：10.13928/j.cnki.wrahe.2023.01.015
中图分类号:TU45
引用信息:
[1]李加华,陈世万,杨福波,等.贵州赤水红层砂岩压缩破坏过程孔隙及渗透率试验研究[J],2023,54(01):163-174.DOI:10.13928/j.cnki.wrahe.2023.01.015.
基金信息:
国家自然科学基金(41902301);; 贵州省科学技术基金([2020]1Y185)