页岩气开发场地地下水污染风险评价研究进展

Review of Soil and Groundwater Pollution Risk Assessment in Shale Gas Development

页岩气勘探开发场地的潜在污染风险不同于普通场地,而针对页岩气开发全过程的场地土壤地下水污染风险评价研究较为薄弱。文章综述了污染场地风险评价的理论与方法,介绍了岩溶介质地下水及溶质运移模拟的研究进展,指出由于页岩气开发场地的复杂性,基于污染物在土壤地下水系统迁移的过程模拟法(考虑岩溶通道)较适用于页岩气开发全过程污染风险评价,强调应加强页岩气开发不同生产阶段土壤、地下水污染监测,拓展风险评价指标筛选的理论与方法。同时,应强化岩溶通道及裂隙相关参数的获取,并开展土壤-地下水耦合评价及页岩气开发全过程(勘探—钻井—压裂返排—生产)风险评价,为页岩气绿色开发提供理论指导。

The potential contamination risk of shale gas exploration and development sites is different from that of ordinary sites,and the research on the risk evaluation of soil groundwater contamination at sites for the whole process of shale gas development is relatively weak.This study summarized the theories and methods of risk evaluation of contaminated sites,introduced the research progress of groundwater and solute transport simulation in karst media,pointed out that due to the complexity of shale gas development sites.The results shown that the process simulation method based on the migration of pollutants in the soil-groundwater system(taking karst channels into account)is more suitable for the evaluation of the risk of contamination of the whole process of shale gas development,and emphasized that the monitoring of the contamination of soils and groundwater in different phases of the shale gas development should be strengthened,and the theory and methods of screening risk evaluation indicators should be expanded.It is emphasized that the monitoring of soil and groundwater pollution in different production stages of shale gas development should be strengthened,and the theory and method of screening risk evaluation indexes should be expanded.At the same time,we should strengthen the acquisition of parameters related to karst channels and fractures,and carry out coupled soil-groundwater evaluation and risk evaluation of the whole process of shale gas development(exploration,drilling,fracturing and drainage,and production),so as to provide theoretical guidance for the green development of shale gas.