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高校地质学报 ›› 2023, Vol. 29 ›› Issue (4): 571-579.DOI: 10.16108/j.issn1006-7493.2021110

• 水文地质学 • 上一篇    下一篇

高盐废水深部地质封存反应运移数值模拟

杜卓然1,杜 松2,杨 蕴3,宋 健1,吴剑锋1*,吴吉春1   

  1. 1. 南京大学 地球科学与工程学院,南京 210023;
    2. 中国煤炭地质总局 勘查研究总院,北京 100039;
    3. 河海大学 地球科学与工程学院,南京 211100
  • 出版日期:2023-08-15 发布日期:2023-08-15

Reactive Transport Numerical Modeling for Deep Geological Sequestration of Brine Wastewater

DU Zhuoran1,DU Song2,YANG Yun3,SONG Jian1,WU Jianfeng1*,WU Jichun1   

  1. 1. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China;
    2. General Prospecting Institute China National Administration of Coal Geology, Beijing 100039, China;
    3. School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China
  • Online:2023-08-15 Published:2023-08-15

摘要: 高盐废水深井灌注在中国尚处于准入论证阶段,废液组分在深部封存体中的运移涉及变密度驱动、水岩化学反应和变参数协同物理—化学作用过程,定量刻画这些复杂过程是深井灌注亟需解决的关键科学难题之一。文章选择鄂尔多斯盆地某灌注储层为模拟原型,采用PFLOTRAN程序构建适用于高盐废水深井灌注的变密度变参数多组分反应运移模型,以预测和评价高盐废水灌注深部地质体后的迁移转化、储层矿物演变及储层性质的改变。模拟结果表明,高盐废水注入灌注层产生硬石膏、方解石、萤石等次生矿物沉淀;模拟期100年内地质储存能力下降约1.51%,污染羽扩散范围为2.57 km2。所建模型可为定量刻画高盐废水深井灌注组分迁移转化过程提供模拟工具。

关键词: 深井灌注, 变参数, 变密度流, 反应运移模拟, PFLOTRAN

Abstract: Brine wastewater deep well injection in China is still at the stage of access demonstration. The transport of liquid waste in deep reservoirs involves variable density drive, water-rock chemical reactions and variable-parameter synergistic physical-chemical interactions. How to quantitatively characterize these processes is one of the key scientific and technological challenges to be solved in deep well injection. Consequently, this paper selected a certain injection zone in Ordos Basin as prototype, used PFLOTRAN to construct a variable-density and variable-parameter reactive solute transport model to predict and evaluate the migration, transformation and evolution of reservoir minerals, as well as the change of reservoir properties after the brine wastewater injection to the deep geological body. As the simulation results showed, the injection of brine wastewater into the injection zone contributes to secondary minerals precipitation, such as anhydrite, calcite and fluorite; the geological storage capacity decreases by 1.51% approximately in the simulated 100 years; and the contamination area is around 2.57 km2. This model provides a simulation tool to quantitatively characterize the migration and transformation process of brine wastewater components after the deep well injection.

Key words: deep well injection, variable parameters, variable-density flow, reactive transport modeling, PFLOTRAN

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