某油田区地下水综合防污性能评价

Assessment of groundwater integrated defense ability to contamination in a certain oilfield

以某油田区地下水为研究对象,对DRASTIC模型的指标进行了继承和改进,评价了研究区地下水的综合防污性能。首先建立了该区潜水综合防污性能评价指标体系,选取了潜水固有防污性能指数、油井分布密度、土地利用类型三个指标。在此基础上,又选取潜水综合防污性能指数、上部隔水层厚度、承压含水层岩性和承压含水层埋深四个指标构建了承压水综合防污性能评价指标体系。采用正方形剖分法划分评价单元,应用ArcGIS空间分析模块提取评价指标的性状数据,采用专家打分——层次分析法确定指标权重,选取综合指数模型对地下水综合防污性能进行评价及分区。结果表明:该区大部分地区地下水的综合防污性能较好,主城区及油井分布区的综合防污能力较低。经改进的评价方法能反映出油田区地下水的综合防污性能。

The conception of assessment of groundwater integrated defense ability to contamination is put forward first.The DRASTIC index system is improved and groundwater integrated assessment index systems are established,namely,GML and QUCN.In the assessment,square division method is adopted to divide assessment sections,and space analysis model in ArcGIS is used to extract indexes attribute value.Expert scoring-analytic hierarchy process method is adopted to calculate the weight values of the index.Comprehensive index method assessment model is finally employed to compute groundwater integrated defense ability.The results suggest that groundwater integrated defense ability in most parts of the study area is good,and assessment of groundwater integrated defense ability to contamination is practical and if of macroscopic guidance.