中文摘要：

茂名石油工业的发展,使其地下水水质受到严重的污染,研究该地区地下水的水质形成机理有利于更好地保护和利用地下水资源。本研究对2005年和2012年旱、雨季在茂名市区采集的19个地下水水质数据,进行水质类型分类,比较水质类型以及SO42-浓度,NO3-浓度的时空分布和变化,探讨了地下水水质的形成机理。结果表明：HCO3-Ca为自然型,SO4-Ca为矿山污染型,NO3·HCO3-Ca为农业污染型,其余为混合污染型。矿山开采停止后地下水中旱季SO42-最大浓度逐渐降低,雨季SO42-最大浓度逐渐升高,旱、雨季的NO3-浓度变化没有规律性,但最大浓度在70~90 mg/L之间变化。

英文摘要：

Along with the development of Maoming＇s petroleum industry, its groundwater has been polluted seriously. Studying on the formation mechanism of the groundwater＇s quality helps to protect and exploit groundwater properly. This work classify groundwater types of the study area including 19 sampling sites. Data are recorded in dry and rainy season in both 2005 and 2012. The time-space distribution of the water quality types and the content of the SO42-, NO3- are also studied. The formation mechanism of groundwater quality is investigated. The results are as follow： HCO3-Ca water is natural type, SO4-Ca water is polluted by mines, NO3·HCO3-Ca water is polluted by agriculture, the rest are mixed polluted. After stopping the mining, the maximum concentration of SO42- decreases in dry season, but increases in rainy season. The concentration of NO3-varies irregularly in both dry and rainy season, and the maximum concentration of NO3- varies between 70~90 mg/L.