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为研究气田建设项目对地下水产生的石油类污染,以西北某气田开发区地下水为研究对象,在水文地质条件调查和地下水污染源与污染途径分析的基础上,采用GMS软件建立研究区地下水流模型和溶质运移模型,模拟预测了凝析油储罐破裂泄漏情景下石油类污染物在地下水中的迁移规律及自然净化过程。结果表明:模拟期内地下水中的石油类浓度小于标准值,地下水未超标但受到轻微污染;污染晕中心浓度随时间减小,污染场地及下游位置污染物浓度先增大后减小,距离污染源越远的位置峰值浓度越小。
In order to study petroleum pollution caused by groundwater in gas field construction projects, groundwater in a gas field development zone in Northwest China was studied. Based on the investigation of hydrogeological conditions and the analysis of groundwater pollution sources and sources, GMS software was used to establish the groundwater flow model and Solute transport model to simulate the migration rule and natural purification process of petroleum pollutants in groundwater under the condition of cracked and leaked condensate storage tank. The results showed that the concentration of petroleum in groundwater was less than the standard value during the simulation period, groundwater did not exceed the standard but was slightly polluted; the concentration of pollutant halo decreased with time, the concentration of pollutants in the contaminated site and downstream first increased and then decreased, The farther the position peak concentration is smaller.