寺家庄井田陷落柱对煤层气井产出水地球化学特征的影响  

Effect of karstic collapse column on hydrogeochemistry of produced water from coalbed methane wells in Sijiazhuang mine field

作　　者：徐占杰[1] 刘钦甫[1] 宋璞[1] 姬景超 毋应科 XU Zhanjie;LIU Qinfu;SONG Pu;JI Jingchao;WU Yingke(School of Geoscience and Surveying Engineering, China University of Mining and Technology, Beijing 100083, China)

机构地区：[1]中国矿业大学(北京)地球科学与测绘工程学院,北京100083

出　　处：《煤田地质与勘探》2017年第2期50-54,共5页Coal Geology & Exploration

基　　金：山西省煤层气联合研究基金项目(2013012005)~~

摘　　要：根据产出水的矿化度、离子类型和离子质量浓度化验结果,采用水化学、单因子方差分析等方法,研究了寺家庄井田陷落柱对煤层气井产出水地球化学特征的影响,对陷落柱地区煤层气的勘探开发具有参考价值。寺家庄井田煤层气井产出水的平均矿化度为1 484 mg/L,属微咸水,HCO_3-Na型。2014年4月和8月采集的井田北部煤层产出水样平均矿化度较南部高,陷落柱在井田北部较发育,蒸发作用较强,可能是导致井田北部产出水矿化度略高的原因之一。产出水矿化度随煤层气井排采时间增加略有增高且水型没有改变,说明寺家庄井田煤层气井在排水降压过程中地下水未得到及时补给。不同构造背景下煤层产出水的Na^+浓度无显著差异,井田北部陷落柱区样品282位于次级向斜轴部且临近陷落柱,其Na+质量浓度最大,平均值达462 mg/L,归因于水动力条件弱且较强的蒸发作用。In order to study the hydrogeochemistry characteristics of produced water from coalbed methane(CBM)wells in karstic collapse column(KCC)area,Sijiazhuang block,the salinity,type and ion concentration of Sijiazhuang coalbed methane produced water(CMPW)were tested and analyzed with hydrochemistry and one-way variance statistics method.The analyses are useful for CBM exploration and development in KCC areas.The average salinity of CMPW samples is1484mg/L,belonging to saline groundwater with HCO3-Na type.The CMPW in the north has higher salinity than that in the south either in April or in August.KCCs were and are developed in the north and may increase the evaporation of the groundwater.The salinity of CMPW in August is higher than that in April,slightly increasing with CBM production processing,indicating that the groundwater does not get recharged on time in the process.The Na+concentrations of samples under different regional tectonic regimes are significantly different,of which sample No.282occur on a synclinal axis and near a KCC,which may result in the highest Na+concentration,with a mean of462mg/L.

关 键 词：产出水 陷落柱 水地球化学 煤层气 寺家庄井田 

分 类 号：P618[天文地球—矿床学]