某地区钻井固废中重金属含量分析

Analysis of Heavy Metal Content of the Drilling Waste in a Certain Area

通过分析某地区钻井作业所产生的固体废物来源岩屑、废弃钻井液中的重金属含量,以及该地区部分区域的土壤中重金属含量,结果表明:聚磺钻井液重金属含量相对较高,与GB 15618—1995《土壤环境质量标准》比较,镉、锌、总铬超过二级标准;钻井固废中锌超过标准背景值,镉、总铬超过二级标准(旱土);地层中重金属含量分布不均,锌超过了标准背景值,镉和总铬超过二级标准;部分区域土壤中总铬超过了标准背景值,镉远高于二级标准。钻井固废中的重金属污染主要来源为钻井液。

conclusion has been drawn based on the analysis of the heavy metal content in rock debris-and discarded mud-formed solid wastes produced in drilling operation and in the soil of partial regions in a certain area:the heavy metals in polymer-sulphonated mud like cadmium(Cd),zinc(Zn),and total chromium(Cr) have largely exceeded the secondary standard and the mean value in soils according to the standard ' Environmental Quality Standard for Soils '(GB15618—1995).The Cd,Zn,and total Cr in the solid wastes of drilling well have surpassed the standard background value and the Cd and total Cr in arid soil is beyond the secondary standard.The heavy metals are unevenly distributed in stratum where the total Cr,Cd and Zn have outnumbered the standard background value and the Cd and total Cr the secondary standard.The Cd and total Cr in the soil of partial areas have outstripped the standard background value and the Cd the secondary standard.The heavy metal pollutions are chiefly generated by the drilling mud in the drilling well solid wastes.