某低渗透砂岩铀矿床孔渗和工艺矿物学特征及其对矿层潜在伤害影响

Porosity,Permeability and Process Mineralogy Characteristics and Its Potential Damage of a Low Permeability Sandstone Uranium Deposit

为揭示低渗透砂岩铀矿物性、岩性及其影响因素之间的关系,为矿床开发提供数据依据,研究选取内蒙古某低渗透砂岩铀矿床岩矿石样,运用孔-渗测定、矿物鉴定、元素分析、扫描电镜等手段测定其物性、岩性参数,从微观特征及宏观分布上分析各参数之间的影响关系,以及对矿层的潜在伤害作用。结果表明,该矿床孔-渗纵向分布基本符合指数关系;矿层不同的敏感元素、孔隙胶结物及矿物赋存状态对孔-渗参数及潜在伤害具有不同程度的影响。

In order to reveal the relationship between the mineralogy,lithology and influencing factors of low-permeability sandstone,and provide data basis for the development of the deposit,the uranium rock and ore samples of a low-permeability sandstone uranium deposit in Inner Mongolia were selected and studied,and their physical and lithologic parameters were determined by means of pore-permeability determination,mineral identification,element analysis,scanning electron microscopy and other methods,and the relationship between the parameters,and the potential damage to the ore bed were analyzed from the microscopic characteristics and macroscopic distribution.The results show that the vertical distribution of porosity and permeability basically conforms to the exponential relationship;Different sensitive elements,pore cement and mineral occurrence state of the ore bed have different degrees of influence on the pore-permeability parameters and potential damage.