柴达木盆地南翼山地区油田水中溶解性有机质的分析

Analysis of Dissolved Organic Matter in Oilfield Produced Waters in the Nanyishan Area of the Qaidam Basin

采用液液萃取方法，以二氯甲烷为萃取剂，对从柴达木盆地南翼山地区不同地点、不同深度的油气井中的地下油田水所采集的5种水样中的溶解性有机质（DOM）进行了富集和萃取分离。采用总有机碳测试、FTIR和GC-MS等方法对萃取所得水样的DOM进行了表征。表征结果显示，该地区不同油气井水样中的DOM的种类和相对含量有所不同，且油井水样中的DOM含量高于气井水样。实验结果表明，该地区油田水中DOM主要为：苯、甲苯、二甲苯、苯酚和烷基酚等芳香类化合物；脂肪酸、长链烷烃等脂肪类化合物；少量含氮有机物及碳水化合物等。该结果可为油田水中DOM的处理或去除提供基础数据。

Five oilfield produced water samples containing dissolved organic matter（DOM） from the Nanyishan area of the Qaidam basin were enriched and separated by liquid-liquid extraction method with dichloromethane as the extractant. DOM in the samples was analyzed by a total organic carbon analyzer and characterized by means of FTIR and GC-MS. The results indicated that,the types and contents of DOM in different wells were different,and the DOM values were relatively higher in the oil wells than those in the gas wells. The experimental results showed that DOM in the oilfield produced waters mainly consisted of aromatics（namely benzene,toluene,xylene,phenol and alkyl phenols）,aliphatics（namely fatty acids and long chain alkanes）,and relatively small amount of nitrogen-containing compounds and carbohydrates. The study results could provide basic data for the treatment of the oilfield produced waters.