0 引言
1 地质背景
2 样品与实验方法
3 元素地球化学特征
图2 太阳区块及威远、长宁和涪陵页岩气田压裂返排液主量元素组成箱式图(返排时间在40 d内)(威远、长宁、涪陵页岩气田数据来自文献[4,5,7])Fig.2 Box plot of major elements in flowback water from Taiyang block, also shown are those from Weiyuan, Changning and Fuling shale gas fields (days after hydraulic fracturing are within 40 days) (data of Weiyuan, Changning, Fuling shale gas fields are from Refs.[4,5,7]) |
表1 太阳区块返排液、南门河河水与杀菌剂地球化学组成Table 1 Geochemical composition of flowback water from Taiyang block, Nanmenhe river water and biocide |
样品类型 | 样品 名称 | 返排时间 /d | 垂深/m | 87Sr/86Sr | Cl | Br | I | Na | K | Mg | Ca | Br/Cl | Li | B | Sr | |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
/(mg/L) | /(mg/L) | /(mg/L) | /(mg/L) | /(mg/L) | /(mg/L) | /(mg/L) | /(mg/L) | /(mg/L) | /(mg/L) | |||||||
河水 | A | 0.709 6 | 8.3 | 0.01 | 0.002 | 6.4 | 1.4 | 6.2 | 36 | 0.000 7 | 0.000 8 | 0.010 | 0.25 | |||
添加剂 | B | 0.711 1 | 36 | 0.06 | 0.012 | 24 | 1.4 | 41 | 162 | 0.000 8 | 0.006 6 | 0.031 | 0.34 | |||
返排液 | C | 31 | 1 440.17 | 0.717 2 | 9 842 | 47 | 7.05 | 6 690 | 126 | 37 | 185 | 0.002 1 | 24.7 | 5.3 | 22.2 | |
返排液 | D | 34 | 2 245.16 | 0.716 5 | 10 534 | 47 | 15.8 | 7 173 | 153 | 31 | 140 | 0.002 0 | 19.4 | 17.1 | 24.4 | |
返排液 | E | 34 | 2 325.49 | 0.716 5 | 11 487 | 55 | 16.1 | 7 828 | 166 | 35 | 163 | 0.002 1 | 21.9 | 17.5 | 31.6 | |
返排液 | F | 34 | 2 406.16 | 0.716 5 | 11 785 | 56 | 19.1 | 8 201 | 168 | 34 | 160 | 0.002 1 | 21.7 | 17.3 | 32.9 | |
样品类型 | 样品 名称 | 返排时间 | 垂深/m | Al | V | Cr | Mn | Fe | Co | Ni | Cu | Rb | Mo | Ba | Pb | Sb |
/d | /(μg/L) | /(μg/L) | /(μg/L) | /(μg/L) | /(μg/L) | /(μg/L) | /(μg/L) | /(μg/L) | /(μg/L) | /(μg/L) | /(μg/L) | /(μg/L) | /(μg/L) | |||
河水 | A | 10 | 0.5 | 0.4 | 0.9 | 42 | 0.1 | 0.5 | 7.8 | 0.73 | 0.2 | 52 | 0.15 | 0.10 | ||
添加剂 | B | 0.88 | 0.8 | 9.9 | 454.9 | 218 | 0.4 | 2.4 | 2.9 | 0.59 | 1.4 | 155 | 0.03 | 0.21 | ||
返排液 | C | 31 | 1 440.17 | 59 | 44.6 | 6.5 | 812.6 | 7 458 | 0.6 | 2.2 | 222.3 | 169 | 10.4 | 27 856 | 1.57 | 0.58 |
返排液 | D | 34 | 2 245.16 | 77 | 44.6 | 8.1 | 448.8 | 2 389 | 0.3 | 3.0 | 265.8 | 255 | 11.5 | 4 551 | 0.45 | 1.39 |
返排液 | E | 34 | 2 325.49 | 62 | 54.2 | 8.5 | 492.4 | 4 452 | 0.4 | 0.5 | 196.5 | 279 | 19.1 | 55 719 | 0.79 | 1.28 |
返排液 | F | 34 | 2 406.16 | 58 | 54.4 | 6.7 | 409.5 | 3 444 | 0.6 | 1.9 | 89.6 | 295 | 28.4 | 61 407 | 0.88 | 1.95 |
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图3 四川盆地太阳区块和威远页岩气田返排液,震旦系、寒武系、二叠系、三叠系飞仙关组和须家河组地层水Mg—Cl(a)、Ca—Cl(b)变化(威远页岩气田返排液和其他层系地层水数据来自文献[4, 15-17])Fig.3 Plots of Mg versus Cl (a) and Ca versus Cl (b) of Taiyang and Weiyuan flowback water, and formation water from Sinian, Cambrian, Permian, Triassic Feixianguan and Xujiahe formations (data of Weiyuan flowback water and formation water are from Refs.[4, 15-17]) |
图4 太阳区块及威远、长宁和涪陵页岩气田压裂返排液微量元素组成箱式图(返排时间在40 d内)(威远、长宁、涪陵页岩气田数据来自文献[4,5,7])Fig.4 Box plot of minor elements in flowback water from Taiyang block, also shown are those from Weiyuan, Changning and Fuling shale gas fields (days after hydraulic fracturing are within 40 days) (data of Weiyuan, Changning, Fuling shale gas fields are from Refs.[4,5,7]) |
图5 太阳区块及威远、长宁和涪陵页岩气田压裂返排液,南门河河水和杀菌剂Sr—Cl、Ba—Cl、Rb—Cl图(返排时间在40 d内)(威远、长宁、涪陵气田数据来自文献[4,5,7])Fig.5 Plots of Sr versus Cl, Ba versus Cl and Rb versus Cl of flowback water from Taiyang block, and Weiyuan, Changning and Fuling shale gas fields, also shown are those of Nanmenhe river water and biocides (days after hydraulic fracturing are within 40 days) (data of Weiyuan, Changning, Fuling gas fields are from Refs.[4,5,7]) |
图6 太阳区块及威远、长宁和涪陵页岩气田压裂返排液阴离子组成箱式图(返排时间在40 d内)(威远、长宁、涪陵气田数据来自文献[4,5,7])Fig.6 Box plot of anions in flowback water from Taiyang block, also shown are those from Weiyuan, Changning and Fuling shale gas fields (days after hydraulic fracturing are within 40 days) (data of Weiyuan, Changning, Fuling gas fields are from Refs.[4,5,7]) |