煤层气井产出水化学特征及水化学场动态演化规律
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摘要
为查明煤层气井产出水的化学特征及水化学场动态演化规律,对沁水盆地南部多口煤层气井产出水进行连续长期的水化学场检测,通过对比3号和15号煤层产出水离子浓度的变化以及各离子之间、同位素的相关关系,发现3号和15号煤层产出水阳离子主要为Na++K+,阴离子以HCO-3和Cl-为主,水化学类型均多为HCO3·Cl—Na型。p H范围为7.5～8.6。溶解性总固体最小为1 149.6 mg/L,最大达到3 617.4 mg/L。3号煤层产出水δD平均为-80.7‰,δ~(18)O平均为-10.4‰,15号煤层气井产出水中δD值平均为-83.6‰,而δ~(18)O值平均为-11.2‰。由δD和δ~(18)O之间的关系可以判断出两个煤层均受大气降水补给。且随着埋深的变浅,δD和δ~(18)O值显示出递增的趋势。由煤层水和临近含水层水的离子成分以及δD与δ~(18)O值对比,可以推测煤层的补给水源。通过产气量与产水量分析,得出溶解性总固体与产气量有明显的正相关关系,这对于产能预测有重要意义。
Continuous long-term hydrochemical field detection is carried out to the produced water from coal bed methane(CBM) wells in the southern Qinshui Basin.The chemical characteristics and dynamic evolution of hydrochemical field for produced water of CBM wells are summarized.For the produced water from the 3# and 15 # coalbeds,Na++ K+are the main cations and HCO-3 and Cl-are the main anions.The hydrochemical type is mainly of HCO3-Cl-Na type.The pH value ranges from 7.5 to 8.6 and the salinity,from 1 149.6 mg/L to 3 617.4 mg/L.For the 3# coalbed produced water,the average δD is about-80.7‰,and δ~(18)O,-10.4‰.For the 15 # coal bed produced water,the average δD is about-83.6‰,and δ~(18)O,-11.2‰.The relation between δD and δ~(18)O indicate that the groundwater from the two coalbeds is of meteoric origin.The values of δD and δ~(18)O decrease with the increasing buried depth.We can determine the supplying aquifer of the coalbed through comparing the ion compositions and the values of δD and δ~(18)O between the coalbed water and its adjacent groundwater.There is a positive correlation between the salinity and gas production via analysising the gas production and water yield.The results are of great significance in the prediction of gas production.
Continuous long-term hydrochemical field detection is carried out to the produced water from coal bed methane(CBM) wells in the southern Qinshui Basin.The chemical characteristics and dynamic evolution of hydrochemical field for produced water of CBM wells are summarized.For the produced water from the 3# and 15 # coalbeds,Na++ K+are the main cations and HCO-3 and Cl-are the main anions.The hydrochemical type is mainly of HCO3-Cl-Na type.The pH value ranges from 7.5 to 8.6 and the salinity,from 1 149.6 mg/L to 3 617.4 mg/L.For the 3# coalbed produced water,the average δD is about-80.7‰,and δ~(18)O,-10.4‰.For the 15 # coal bed produced water,the average δD is about-83.6‰,and δ~(18)O,-11.2‰.The relation between δD and δ~(18)O indicate that the groundwater from the two coalbeds is of meteoric origin.The values of δD and δ~(18)O decrease with the increasing buried depth.We can determine the supplying aquifer of the coalbed through comparing the ion compositions and the values of δD and δ~(18)O between the coalbed water and its adjacent groundwater.There is a positive correlation between the salinity and gas production via analysising the gas production and water yield.The results are of great significance in the prediction of gas production.
引文
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[11]李超,申建,赵锦程,等.沁南某高阶煤井区煤层气井气、水产出差异及其控制因素[J].中国矿业,2018,27(2):117-124.[LI C,SHEN J,ZHAO J C,et al.Control mechanisms of waterproduction and gasproduction divergences of CBM wells in southern Qinshui basin[J].China Mininc Magazine,2018,27(2):117-124.(in Chinese)]
[12]李剑,车延前,熊先钺,等.韩城煤层气田11号煤层水化学场特征及其对煤层气的控制作用,[J].中国石油勘探,2018,23(3):74-80.[LI J,CHE YQ,XIONG X Y,et al.Hydrochemistry field characteristic of 11#coal seam in Hancheng CBM field and its controlling effect on CBM[J].China Petroleum Exploration,2018,23(3):74-80.(in Chinese)]
[13]王志超,邓春苗,卢巍,等.晋城煤层气采出水的水质分析[J].煤炭科学技术,2009,37(1):122-124.[WANG Z C,DENG C M,LV W,et al.Quality analysis on water from coal bed methane borehole in Jincheng area[J].Coal Science and Technology,2009,37(1):122-124.(in Chinese)]
[14]王红岩,张建博,刘洪林,等.沁水盆地南部煤层气藏水文地质特征[J].煤田地质与勘探,2001,29(5):33-36.[WANG H Y,ZHANG J B,LIU H L,et al.Hydrogeologic feature of coalbed methane reservoir in the southern Qinshui Basin[J].Coal Geology&Exploration,2001,29(5):33-36.(in Chinese)]
[2]单耀,秦勇,王文峰.徐州-大屯矿区矿井水类型与水质分析[J].能源技术与管理,2007(4):41-43.[CHAN Y,QIN Y,WANG W F.Analysis for types and quality of coal mine water of the XuzhouDatun coal mine district[J].Energy Technology and Management,2007(4):41-43.(in Chinese)]
[3]高波.贾汪矿区煤矿关闭后地下水化学特征[D].徐州:中国矿业大学,2014.[GAO B.Groundwater chemical characteristic of Jia Wang coal field in response to mine closure[D].Xuzhou:China University of Mining and Technology,2014.(in Chinese)]
[4]孙红福,赵峰华,张璐,等.重庆西部干旱区煤矿矿井水水质综合评价[J].煤炭学报,2014,39(4):736-743.[SUN H F,ZHAO F H,ZHANG L,et al.Comprehensive assessment of coal mine drainage quality in the arid area of Western Chongqing[J].Journal of China Coal Society,2014,39(4):736-743.(in Chinese)]
[5]刘会虎,桑树勋,李梦溪,等.煤层气群井排采地层水来源判识及其意义[J].水文地质工程地质,2015,42(1):29-34.[LIU H H,SANG S X,LI MX,et al.Discrimination of source of formation water during CBM drainage with the multi-well pattern and its significance[J].Hydrogeology&Engineering Geology,2015,42(1):29-34.(in Chinese)]
[6]张松航,唐书恒,李忠城,等.煤层气井产出水化学特征及变化规律---以沁水盆地柿庄南区块为例[J].中国矿业大学学报,2015,44(2):292-299.[ZHANG S H,TANG S H,LI Z C,et al.The hydrochemical characteristics and ion changes of the coproducedwater:taking Shizhuangnan block,south of the Qinshui basin as an example[J].Journal of China University of Mining&Technology,2015,44(2):292-299.(in Chinese)]
[7]卫明明,琚宜文.沁水盆地南部煤层气田产出水地球化学特征及其来源[J].煤炭学报,2015,40(3):629-635.[WEI M M,JU Y W.Chemical characteristics and origin of produced waters fromcoalbed gas field in the southern of Qinshui Basin[J].Journal of China coal Society,2015,40(3):629-635.(in Chinese)]
[8]时伟,唐书恒,李忠城,等.沁水盆地南部山西组煤储层产出水的化学特征[J].煤炭科学技术,2017,45(3):154-160.[SHI W,TANG S H,LI Z C,et al.Chemical characteristics of drainage water from Shanxi Formation coal reservoir of Southern Qinshui Basin[J].Coal Science and Technology,2017,45(3):154-160.(in Chinese)]
[9]时伟,唐书恒,李忠城,等.沁水盆地南部山西组煤储层产出水氢氧同位素特征[J].煤田地质与勘探,2017,45(2):62-68.[SHI W,TANG S H,LIZ C,et al.Hydrogen-oxygen isotope characteristics of produced water from coal reservoir of Shanxi Formation in Qinshui basin[J].Coal Geology&Exploration,2017,45(2):62-68.(in Chinese)]
[10]刘世奇,桑树勋,MA Jingsheng.沁水盆地南部高阶煤储层气水产出过程分析[J].煤炭科学技术,2017,45(9):1-6.[LIU S Q,SANG S X,MA J S.Analysis on gas and water output process of high rank coal reservoir in Southern Qinshui Basin[J].Coal Science and Technology,2017,45(9):1-6.(in Chinese)]
[11]李超,申建,赵锦程,等.沁南某高阶煤井区煤层气井气、水产出差异及其控制因素[J].中国矿业,2018,27(2):117-124.[LI C,SHEN J,ZHAO J C,et al.Control mechanisms of waterproduction and gasproduction divergences of CBM wells in southern Qinshui basin[J].China Mininc Magazine,2018,27(2):117-124.(in Chinese)]
[12]李剑,车延前,熊先钺,等.韩城煤层气田11号煤层水化学场特征及其对煤层气的控制作用,[J].中国石油勘探,2018,23(3):74-80.[LI J,CHE YQ,XIONG X Y,et al.Hydrochemistry field characteristic of 11#coal seam in Hancheng CBM field and its controlling effect on CBM[J].China Petroleum Exploration,2018,23(3):74-80.(in Chinese)]
[13]王志超,邓春苗,卢巍,等.晋城煤层气采出水的水质分析[J].煤炭科学技术,2009,37(1):122-124.[WANG Z C,DENG C M,LV W,et al.Quality analysis on water from coal bed methane borehole in Jincheng area[J].Coal Science and Technology,2009,37(1):122-124.(in Chinese)]
[14]王红岩,张建博,刘洪林,等.沁水盆地南部煤层气藏水文地质特征[J].煤田地质与勘探,2001,29(5):33-36.[WANG H Y,ZHANG J B,LIU H L,et al.Hydrogeologic feature of coalbed methane reservoir in the southern Qinshui Basin[J].Coal Geology&Exploration,2001,29(5):33-36.(in Chinese)]
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