石油类在环境非敏感区土壤中的迁移规律研究

Migration Law of the Petroleum Pollutants in the Soil of Non-sensitive Area

通过实地采集样品和室内模拟实验,重点分析了在油田环境非敏感地区,风沙土、棕漠土、盐土、林灌草甸土、龟裂土等有代表性的土壤类型中,石油类随污水迁移的规律。结果表明:风沙土、棕漠土的渗透性较好,龟裂土、林灌草甸土的渗透性很弱,而粘质盐土的渗透性非常小;以较高浓度的含油污水持续排放于环境非敏感区土壤上,石油类污染物在土体中下渗迁移程度有限,很难穿透包气带而进入地下水。

Through gathering soil and water samples in field and simulation test in lab,the migration law of the petroleum pollutant in the soil along with sewage is analyzed in the non-sensitive area of the oil field. The selected representative soil types are the wind sandy soil, the gray and brown desert soil, the meadow soil and the chap soil. The results of this study are summarized as follows：The permeability of the wind sandy soil and the gray and brown desert soil is strong; The permeability of the chap soil and the meadow soil is weak,the permeability of the mucilage salt clay is very weak. The petroleum pollutants contained in class Ⅲ waste water or even high are migrated limitly in soil profile. It is very difficult to penetrate the occluded gas belt. This provides the basis to formulate the sewage discharges standard reasonably.