论文详情
制备已知孔隙结构的人造岩心是实验研究多重孔隙结构岩石物理性质的基础。通过前期大量试验,筛选确定了一种制备多重孔隙结构人造岩心的新方法。该方法采用天然岩屑颗粒作为岩心骨架,环氧树脂胶结剂作为固结材料,岩屑颗粒间形成粒间孔隙。制备岩心时,在岩心骨架中嵌入易溶于水的无机盐颗粒(如NaCl颗粒)和与强酸或强碱反应的金属薄片(如铝箔片、薄铁片)；岩心固结成形后,分别采用蒸馏水、与金属薄片反应但不与岩屑颗粒反应的酸或碱液淋滤岩心,将嵌在骨架中的无机盐颗粒和金属薄片溶蚀,形成中空的溶孔和裂隙；并通过实验确定了骨架中无机盐颗粒和金属薄片完全溶蚀的判断方法。实验证明该多重孔隙结构人造岩心的制备方法能够定量控制岩心的裂隙和溶孔参数；制备出的人造岩心可为测试研究多重孔隙结构岩石的微观渗流机理、声波特性、电特性等提供实验岩心。
Artificial core preparation with known pore structures is the basis of experimental study on the physical properties of rock with multiple pore structures.Based on abundant pre-trial experiments,a new method of artificial core preparation with multiple pore structures is proposed.By using this method,naturally occurring cuttings are taken as core matrix,epoxy as cements,and interparticle pores will be formed between cuttings.During artificial core preparation,mineral salt grains which are easily dissloved in water,such as NaCl grains,and thin penny-shaped metal foils which can easily react with strong acid or alkalis,such as aluminum foil and thin iron sheet,are embedded into the core matrix.After the epoxy consolidated,we firstly use distilled water to leach the salt grains from the core,and then use strong acid or alkalis which do not react with the cuttings to leach the metal foils from the core; finally,hollow dissolved-pores and cracks are formed.By experiments,we also identified whether the salt grains or metal foils are completely leached out.Experiments results show that the method of artificial core preparation with multiple pore structures can quantitatively control porosity of cracks and dissolved-pores,and also the geometry of cracks.This method can provide artificial cores for rock physics experiments to further study the microscopic percolation mechanism,acoustic and electrical properties of multiple pore structure.
国家自然科学基金(51274230)和中国石油大学(华东)优秀博士学位论文培育计划(UPC201403011)共同资助。