典型油田回注水区浅层地下水环境评估研究

Investigation and assessment of shallow groundwater in reinjection area of typical oil field.

近年来,国家和石油化工行业积极推进地下水污染防治,防止回注采油生产等对地下水造成污染。通过研究评估胜利油田典型采油厂注水区浅层地下水质量,调查发现地下水中石油类含量较低;溶解性总固体与氯化物含量很高,表现出明显的咸水水化学特征;地下水无机离子构成比例与回注水相似度较高,但回注水中无机盐浓度显著低于大部分地下水样品;回注水中含有较高浓度的石油类和高锰酸盐指数,但溶解性总固体和氯化物指标均远低于区域地下水样品的中位数水平。研究表明,注水采油生产未对地下水造成面源污染,注水活动在工艺运行和设备维护均能达到设计要求的情况下没有对浅层地下水环境造成明显影响。

The state and petrochemical industry actively control of groundwater pollution to prevent groundwater pollution caused by reinjection and oil production.This paper studies the quality of shallow groundwater in the injection area of a typical oil production plant in Sheng Li Oilfield.The content of petroleum in groundwater was low.The soluble total solids and chloride content are very high,showing obvious chemical characteristics of brackish water.The proportion of inorganic ions in groundwater is similar to that in the reinjected water,but the concentration of inorganic salts in the reinjected water is significantly lower than that in most groundwater samples.Re-injection water contains higher concentrations of petroleum and permanganate indices,but the total soluble solids and chloride indices are much lower than the median level of regional groundwater samples.The study shows that water injection and oil production do not cause non-point source pollution to groundwater.