Abstract:

Oil shale resources are abundant and most of them are buried deep in China. In-situ oil shale mining technology can greatly improve mining efficiency and economic benefit. However，the pollutants in the semi-coke and residue left behind after in-situ mining can damage the groundwater environment by solute migration under the action of water and rock. The change of physical properties of oil shale after in-situ mining plays a decisive role in the safety of groundwater quality. Meanwhile，the state of the adjacent hydrogeology of the rock formation also affects the migration of contaminants. In this paper，the changes in porosity and permeability of oil shale before and after pyrolysis were summarized，typical oil shale mines and underground aquifers in China were described，and the effects of in-situ oil shale mining on groundwater quality at home and abroad were reviewed. The release of some organic substances，heavy metals and other pollutants after in-situ oil shale mining were mainly discussed，so as to preliminarily clarify the impact of in-situ oil shale mining on groundwater quality. It also looked forward to the key research directions of groundwater environmental protection in oil shale exploitation in the future，with a view to provide a theoretical basis for the necessary risk prevention and control measures for the industrialized oil shale mining in China in the future.

Key words: oil shale, in-situ mining, groundwater quality, organic matter, heavy metals

摘要：

我国油页岩资源十分丰富且多数埋藏较深，油页岩原位开采技术可以大幅提高开采效率，提高经济效益。但原位开采遗留的半焦、残渣中的污染物会在水岩作用下发生溶质迁移而对地下水环境造成破坏。原位开采后，油页岩物化性质的变化对地下水水质安全起着决定性作用，同时岩层相邻水文地质的状态也会影响污染物的迁移。总结了油页岩热解前后孔隙度和渗透率的变化，阐述了国内典型油页岩矿区与地下含水层的赋存情况，综述了国内外油页岩原位开采对地下水水质的影响；重点介绍了油页岩原位开采后部分有机物、重金属等污染物的释放情况，以此初步明确油页岩原位开采对地下水水质的影响；展望了今后油页岩开采地下水环境保护的重点研究方向，以期为我国未来实现油页岩工业化开采采取必要的风险防控措施提供理论基础。

关键词: 油页岩, 原位开采, 地下水水质, 有机物, 重金属

CLC Number: 

• X523

• X741