CAJ | 학술논문

研究低渗透性含铀砂岩物理化学耦合作用下的渗流规律，可为地浸工艺参数的设计提供可靠依据。本文选取我国新疆某铀矿山砂岩样品，用自制的渗透性测定实验装置，开展了含铀砂岩原样的物理化学渗流规律的实验研究。结果表明：该低渗透性矿岩存在3个渗流阶段，即启动压力阶段、非线性渗流阶段和线性渗流阶段；改变流体的黏度，可改变流体流通空隙所占的百分比，进而整体上改变矿岩渗透性能；在物理化学渗流前期，矿岩介质与溶浸剂发生化学反应后，使某些较小半径的孔隙变成可连通的，进而使砂岩介质的渗透系数整体变大；在物理化学渗流后期，由于压力和化学耦合作用，孔隙结构进一步演变，当压力梯度敏感度大于化学反应敏感度时，其渗透系数变大，反之变小。
연구저삼투성함유사암물이화학우합작용하적삼류규률，가위지침공예삼수적설계제공가고의거。본문선취아국신강모유광산사암양품，용자제적삼투성측정실험장치，개전료함유사암원양적물이화학삼류규률적실험연구。결과표명：해저삼투성광암존재3개삼류계단，즉계동압력계단、비선성삼류계단화선성삼류계단；개변류체적점도，가개변류체류통공극소점적백분비，진이정체상개변광암삼투성능；재물이화학삼류전기，광암개질여용침제발생화학반응후，사모사교소반경적공극변성가련통적，진이사사암개질적삼투계수정체변대；재물이화학삼류후기，유우압력화화학우합작용，공극결구진일보연변，당압력제도민감도대우화학반응민감도시，기삼투계수변대，반지변소。
To study the seepage law of low‐permeability sandstone uranium ore rock under the physical and chemical coupling action , and provide a reliable basis for the design of parameters for in‐situ leaching ,some samples of sandstone from a uranium mine in Xinjiang were used to carry out experimental research by a homemade permea‐bility test device . T he results indicate that there are three seepage stages in the low‐permeability rock ,namely ,the stage of starting pressure ,the stage of nonlinear seepage and the stage of linear seepage .With the change of fluid viscosity ,the percentage that fluid flow voids occupied in the w hole rock voids and the rock permeability on the w hole can be changed .In the early stage of physical and chemical coupling seepage ,after the media of ore and leaching agent reacting chemically ,the pore structure of medium ore is altered ,and some of the smaller radius of pore is larger and connected ,w hich makes the seepage of fluid larger in the unit area and per unit time ,thereby enabling the overall permeability of sandstone medium becomes larger .In the latter stage of physical and chemical coupling seepage ,due to the pressure and chemical coupling ,the pore struc‐ture further evolves .When the pressure gradient is more sensitive than chemical sensi‐tivity of reaction ,the permeability coefficient increases ,w hereas decreases .