枣园区块煤层气井产出水化学特征及动态变化规律  

The characteristics and dynamic changes of produced water from coalbed methane wells in Zaoyuan block

作　　者：朱卫平 唐书恒[2] 吕建伟[2] 韩继凡 张海霞 徐建红 

机构地区：[1]中国石油吐哈油田公司,新疆哈密839009 [2]中国地质大学能源学院,北京100083

出　　处：《煤田地质与勘探》2015年第1期72-75,共4页Coal Geology & Exploration

基　　金：国家科技重大专项课题(2011ZX05034-003);国家自然科学基金项目(40972108)

摘　　要：沁水煤层气田枣园区块煤层气开采井产出的水具有高盐度、高矿化度的特点,直接排放可能会造成生态环境的破坏。通过连续跟踪采集枣园区块煤层气井产出水样品,并进行了25项物理化学参数的系统测试,分析了矿化度及各种阴、阳离子的动态变化规律。发现其矿化度、氯离子、钠离子浓度均呈现先高后低的变化趋势,而碳酸氢根离子的变化规律相反,呈现先低后高的特点。水化学类型呈现由Cl—Na型向Cl?HCO3—Na型和HCO3?Cl—Na型变化的规律。产出水中阳离子以K++Na+离子为主,阴离子3HCO?和Cl–值较为接近,不存在明显占绝对优势的离子。依据产出水中各离子的变化特点,依据国家Ⅱ类地表水标准,采用回归分析方法,建立了氯离子浓度排采动态变化模型。研究成果为煤层气井产出水处理技术提供了依据。The produced water from CBM well in Zaoyuan block of Qinshui CBM field is characteriaed by highsalinity and high mineralization. direct discharge may damage the ecologic environments. Based on the continuoustracking collection of the produced water samples of CBM wells and the systematically testing 25 physical andchemical parameters, the dynamic changes of the salinity and various anions and cations were analyzed. The resultsshow that the concentration of salinity, chloride ion and sodium ion change from high to low, but the concentrationof bicarbonate ion changes conversely with the trend from low to high. The water changes from Cl-ype to Cl·HCO3-a type and HCO3·Cl-Na type. The cations are mainly K^＋ and Na^＋ ions, and there is no obvious dominantanions, HCO3^- and Cl^- alues are close in the produced water. According to the changes of the ions, themodel of chloride ion concentration in the water was established using nonlinear regression analysis.

关 键 词：煤层气井 产出水 水质 动态变化 枣园区块 

分 类 号：P641.4[天文地球—地质矿产勘探]