新疆某砂岩铀矿含矿层孔隙结构的分形特征  

Pore Structure Fractal Features of the Ore-bearing Layer from a Sandstone-type Uranium Deposit,Xinjiang

作　　者：陈亮[1,2] 谭凯旋[2] 刘江[2] 曾晟[2] 

机构地区：[1]南华大学矿业工程博士后流动站,湖南衡阳421001 [2]南华大学核资源与核燃料工程学院,湖南衡阳421001

出　　处：《中山大学学报（自然科学版）》2012年第6期139-144,共6页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家自然科学基金资助项目(50874063;91026015)

摘　　要：以新疆某砂岩铀矿含矿层为研究对象,利用压汞实验数据,采用分形理论研究含矿层孔隙结构特征,并探讨其与渗透性的关系及成因。含矿层孔隙结构总体上具类似的分形特征和形成机理。孔隙结构表现出双分形特征,大孔隙结构的分维值明显大于小孔隙结构的分维值,表明大孔隙结构的复杂程度明显大于小孔隙结构的复杂程度。大孔隙结构的分维值可判定含矿层的渗透性,并且其高值指示渗透性低,而小孔隙结构的分维值不能判定含矿层的渗透性。流体对不同孔径孔隙结构的改造程度存在差异可能是导致本砂岩铀矿含矿层孔隙结构具双分形特征的一个重要因素。Based on the mercury penetration experiment data, the pore structure fractal features and the relationship between pore structure fractal features and permeability were analyzed in order to document the genesis of ore-bearing layer of a sandstone-type uranium deposit from Xinjiang. The pore structure of ore-bearing layer, with similar fractal features and formation mechanism in general, shows bifractal features. The big pore structure, with larger fractal dimension value, shows higher degree of complex than the small pore structure. The fractal dimension value of the big pore structure, can be used as a proxy of the permeability of the ore-bearing layer. The high value suggests the low permeability. The fractal dimension value of the small pore structure can not be used to estimate the permeability. Difference of fluid modification degrees on pore structures for different pore sizes is possibly an important factor for forming bifractal features of the pore structure of the ore-bearing layer.

关 键 词：孔隙结构 分形 砂岩铀矿 新疆 

分 类 号：F619[经济管理—产业经济]