Evolution and mechanism of permeability of unconsolidated sandstone under high hydrostatic pressure compaction

YANG Fu-jian; HU Da-wei; TIAN Zhen-bao; ZHOU Hui; LU Jing-jing; LUO Yu-jie; GUI Shu-qiang

doi:10.16285/j.rsm.2018.2279

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Evolution and mechanism of permeability of unconsolidated sandstone under high hydrostatic pressure compaction

更新时间：2026-06-25

- Evolution and mechanism of permeability of unconsolidated sandstone under high hydrostatic pressure compaction
- Vol. 41, Issue 1, Pages: 67-77(2020)
- 作者机构：
  
  1. 中国科学院武汉岩土力学研究所岩土力学和工程国家重点实验室,湖北,武汉,430071
  2. 中国科学院大学,北京,100049
  3. 中国电建集团华东勘测设计研究院有限公司,浙江,杭州,310014
  4. 长江勘测规划设计研究院,湖北,武汉,430010
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2018.2279
  CLC： P314
- Online First：05 January 2020，
  
  Published：2020
- 稿件说明：
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YANG Fu-jian, HU Da-wei, TIAN Zhen-bao, et al. Evolution and mechanism of permeability of unconsolidated sandstone under high hydrostatic pressure compaction[J]. 2020, 41(1): 67-77.
DOI：

YANG Fu-jian, HU Da-wei, TIAN Zhen-bao, et al. Evolution and mechanism of permeability of unconsolidated sandstone under high hydrostatic pressure compaction[J]. 2020, 41(1): 67-77. DOI： 10.16285/j.rsm.2018.2279.

摘要

以江汉盆地水热型地热田疏松砂岩为研究对象，施加静水压力至实测地层应力（12.5 MPa），待试样变形稳定后，在恒定渗透流量下研究了疏松砂岩在高静水压力压实作用下渗透特性演化及其机制，为水热型地热田现场尾水回灌过程设备参数的选择提供一些建议。研究结果表明：在高静水压力压实作用下渗透流量（0.5～3.0 mL/min）影响试样达到稳定渗透率的时间，但对最终的稳定渗透率不产生影响，趋于常数4.0×10?3 ?m2；试样两端压差呈非线性增加，且非线性程度随渗透流速的增加而逐渐增大，但最终趋于稳定。此外，疏松砂岩试样沿渗流方向形成管状潜蚀通道，延伸至试样的约2/3处；基于颗粒运移停止时间及管状潜蚀通道在渗流方向的扩展、延伸长度，定义了不同渗透流速下颗粒平均运移速度，发现颗粒运移速度随渗透流速的增加呈指数形式增大，而且单位时间内通过管状潜蚀通道运移的可移动微小颗粒（小于0.075 mm）量随渗透流速的增加而逐渐增多；试样两端压差超过静水压力约1/2时，试样发生潜蚀破坏，上游出现径缩现象。

Abstract

The unconsolidated sandstone in hydrothermal geothermal field in Jianghan basin is taken as the research object. The hydrostatic pressure is applied to a geostress equal to 12.5 MPa. After the deformation of sample is stabilised

the evolution and mechanism of the permeability of unconsolidated sandstone under the compaction of high hydrostatic pressure are studied

which can provide some suggestions for the selection of equipment operating parameters for the tailwater recharge process in the hydrothermal geothermal field. The results indicate that under high hydrostatic pressure compaction

the permeability of unconsolidated sandstone samples tends to be a constant valued of 4.0×10?3 ?m2 within the current range of 0.5 mL/min to 3.0 mL/min. The pressure difference between the two ends of the sample increases nonlinearly with time and the degree of nonlinearity gradually increases with the increase of flow rate

but eventually tends to be stabilised. In addition

the sample of unconsolidated sandstone forms a tubular erosion channel in the direction of penetration

extending to about 2/3 of the sample. Based on the stop time of particle transportation and the extension length of tubular erosion channel in the penetration direction

the average migration velocities of particles under different flow rates are determined. It is found that the particle migration velocity increases exponentially with the increase of flow rate

and the amount of microparticle migrated per unit time increases. When the pressure difference exceeds about 1/2 of the hydrostatic pressure

the sample presents erosion damage and upstream diameter shrinkage.

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