Engineering and Technology Branch,CNOOC Energy Technology &Services Limited Research and Development
Center,CNOoC Gas & Power Group

针对澳大利亚博文盆地中北部Rangal煤系地层渗透率普遍较低的特点,深入分析了区内不同煤层裂缝填充物及煤层宏观非均质性对渗透率的影响,剖析了煤层低渗成因。研究表明,煤层裂缝填充是影响煤层渗透率的主要因素,Rangal地层上部煤层裂缝以黏土矿物填充为主,下部以碳酸盐岩矿物填充为主,煤心试验分析及DST测试结果显示下部煤层渗透率远低于上部,两者相差2个数量级以上;另外,煤层矿物质含量及纵向非均质性是影响煤层渗透率的宏观因素,矿物含量越高则煤层水平渗透率越低,暗煤与亮煤的交互分布导致煤层垂向非均质性强进而严重影响纵向渗透率。研究认为,Rangal地层上部煤层渗透率相对较高,可作为重点挖潜层段。

acording to the genesally low permeatility characteristics of the coal reservoir in the Rangal stata of Eowen Basin Australathe paper ad an indepthanlysis on th .flings n cracks of diferent seam and the seam macro heterogeneity affected to the permeability and analyzed the low permeabilily cause ofthe seamThe study showed that th crack ling of the sean ould be the major facor affected to the permea bility of the seam.Above the Rangal statathe iling would mainly be the clay 'ilings ofthe seam cracks and bll w the Rangal strat ,th flings would mainly be the carbonate illings of the seam cracks . 'he coal core test analysis andthe DST fest resuts showed that the bellvw seam permeabilit was far lower than the permeability of the above seam and there would be over two orders of magniudebetiween the two seam permeailities. n adition,the mineral contents and the longitudinal heterogeneity of the seam woult be the macro factors affected to the seam permeability, The igher mineral content was ,the lower horizontal permeability of the seam would be An interaction distrbution of the duain and clarain caused the ighverical heterogen eity and would seriously infuence the longtudinal permeatilty, The study helda that above the Rangalstata the seam pemeatility would be relativelyhigh and could be the key potential mining seam.

国家科技重大专项资助项目(2011ZX05062)；