摘要
以我国潜在EGS工程靶区热储层-松辽盆地营城组凝灰岩为目标层,通过化学刺激剂岩心流动仪模拟高温环境下土酸注入热储层过程中的化学刺激剂-热储层相互作用。通过TOUGHREACT软件建立反应性溶质运移模型,模拟上述实验的化学反应过程。研究结果表明:加入颗粒稳定剂的低浓度土酸对热储层具有良好的化学刺激效果,岩心裂隙渗透率增加6.7倍。岩体渗透率的增加主要源自于钠长石、钾长石的溶解,石英的溶蚀作用不明显,矿物表面出现次生矿物,即无定型二氧化硅的沉淀。
Experiments were conducted in a high-temperature core flow instrument to evaluate HF-rock (aquifer plus aquitard) reactions that may impact the reservoir of the EGS in the Songliao Basin, China. The chemical reactions in the experiments were simulated through reactive transport modeling by using TOUGHREACT and the information currently available for the solution chemical composition. The results show that the permeability of core fracture increases by 6.7 times at the end of experiments, indicating the good chemical stimulation effect of mud acid with particle stabilizer. Increases of permeability of core are mainly caused by K-feldspar and albite dissolution while the dissolution of quartz is weakened. Amounts of secondary amorphous silica are generated.
出处
《中南大学学报(自然科学版)》
EI
CAS
CSCD
北大核心
2017年第1期247-254,共8页
Journal of Central South University:Science and Technology
基金
国家高技术研究发展计划(863计划)项目(2012AA052801)
国家自然科学基金资助项目(41272254,41402205)~~
关键词
增强地热系统
化学刺激剂
土酸
室内实验
数值模拟
enhanced geothermal systems
stimulation agent
mud acid
laboratory experiments
numerical simulation