Medium conditons and influence mechanism of high salinity mine water transfer and storage by deep well recharge
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摘要: 我国西部干旱-半干旱矿区既面临水资源匮乏,又面临矿井涌水量大、矿井水矿化度高等难题。为减少采煤过程中水资源浪费、保护西部地区水生态环境,基于保水采煤和煤-水双资源协调开采等理论基础与技术方法,围绕“矿井水深部转移存储”这一核心科学理念,提出将处理后的矿井水进行高压深井转移存储,转移至煤层底板深部含水层中存储。在鄂尔多斯盆地东部某矿实施试验井工程,通过开展野外岩样采集、室内电镜扫描、岩石成分分析、压汞等实验与定量-定性方法,研究目的转移存储层的水文地质条件和特征,分析不同高压水力压裂增渗试验主控因素,对比矿井水水质、转移存储层原生地层水水质和转移存储后混合水质,获取了矿井水高压持续深井转移存储的水文地质效应。结果表明:目前试验井单井累计转移存储矿井水量已满足设计预期,且持续高压水力压裂增渗方式可不断改善和渐次增强目的存储层的矿井水存储能力,延长服役时效。因此,高矿化度矿井水深部转移存储在技术和经济上具有可行性,将对西部地区水资源保护、水生态环境可持续发展产生重要意义;同时,相比高矿化度矿井水处理成本,能够有效缓解矿井水处理经济负担,为西部煤矿区矿井水转移存储提供典型示范。Abstract: In the arid and semi-arid regions of the Western China, there is not only a shortage of water resources, but also the problems of large mine water inflow and high salinity of mine water. In order to reduce the waste of water resources in the mining activities and protect water ecological environment in the region, it is proposed to treat the mine water by deeper well recharge to the aquifers under the coal seam based on the theories and technical methods such as mine water transfer and storage, water-preserving mining and coal-water dual resource coordinated mining. A test well project was implemented in a mine in the eastern part of the Ordos Basin. The storage space characteristics of the target recharge aquifers were studied by collecting rock samples, scanning electron microscopy, rock composition analysis and mercury intrusion experiments and quantitative and qualitative methods. Then, the main controlling factors of the in-situ water pressure tests were analyzed, and the quality of mine water and the water quality of the targeted recharge aquifer were compared. Finally the hydrogeological effect of mine water recharge was verified. The research results showed that the potential transport and storage capacity of a single well of the test well could meet a certain amount of mine water recharge demand. Transfer and storage cannot only improve the water richness of the targeted aquifers, but also have a significant impact on the protection of water resources and water ecological environment in the Western China. At the same time, it can reduce the cost of advanced mine water treatment, and relieve the environmental pressure of mine water discharge, which is a typical demonstration for transfer and storage of mine water in western coal mining area.
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Key words:
- western China /
- mine water /
- high salinity /
- deep strata /
- transfer and storage
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表 1 3-1煤层顶板含(隔)水层情况概要
Table 1 Summary of aquifers and aquicludes for 3-1 coal seam roof in the study area
含(隔)水层 岩性 厚度/m最小~最大值/平均值 水动力条件及富水性 水化学特征 第四系含水层 中沙、细沙、粉沙为主 27.0~159.0/109.5 垂向以大气降水为主,地下水流速2.58~3.70 m/d,富水性中等,透水性良好,渗透系数约为0.398 m/d,与侏罗系浅部含水层有水力联系 水化学类型为HCO3-Ca-Na及HCO3-Na-Ca,TDS约为265 mg/L 志丹群含水层 中砂岩、细砂岩、粉砂岩夹泥岩、砂质泥岩、粉砂质泥岩 117.4~292.1/198.0 富水性中等,地下水流速约为0.922 m/h,渗透系数为0.139~ 0.207 m/d,与第四系含水层有水力联系 水化学类型为HCO3-Ca-Na及HCO3-Na,pH值为7.7~9.3,TDS为326.00~436.81 mg/L 安定组隔水层 砂质泥岩夹粉、细粒砂岩 60.8~260.5/116.0 整体隔水,局部砂体厚度大,具有一定的富水性 水化学类型为HCO3-Ca,TDS约为330 mg/L,pH值9.3 直罗组中上部隔水层 泥岩夹砂质泥岩、粉砂岩互层 73.2~228.8/138.0 隔水性能好,能有效阻隔上下含水层间的水力联系。 直罗组底含水层 砂岩夹泥岩、泥质砂岩、粉砂岩 24.1~160.3/77.3 受“两带”高度影响,与煤层顶板砂岩含水层水力联系密切,可视为同一含水层。单位矿井涌水量q为0.056~ 0.16 L/(s-m),渗透系数为0.056 7~ 0.239 1 m/d 水温17~20℃,TDS为566~ 1 660 mg/L,pH值8.2~9.3,F-1质量浓度1.05~4.30 mg/L,水化学类型为SO4-Ca-Na及SO4-Na 延安组含水层 砂岩为主,含煤地层 含水段0~44 m 当前开采煤层顶底板砂岩富水性相对较强,其余煤层间中细砂岩含量相对较低,富水性较弱 可将延安组含水层再细分为若干含水层,且水化学性质差异明显 表 2 煤层底板含水层对比分析
Table 2 Contrastive analysis of aquifers from coal seam floor
含(隔)水层 岩性 均厚/m 水文地质条件 延安组含(隔)水层 上段隔水层为砂泥岩互层,底部为宝塔山粗砂岩(含水层) 含水层段厚65 m 宝塔山砂岩为灰白、灰色粗砂岩和含砾粗砂岩,主要成分为石英、长石,泥质胶结及高岭土质胶结;局部含砾,地下水矿化度大于16 g/L,水化学类型为Cl-Ca型,为苦咸水,水质较差。孔隙率14.3%,主要孔径范围66 nm~8.483 μm 延长组含(隔)水层 砂泥岩互层 595 二马营组隔水层 中砂岩、泥岩互层 158 和尚沟组隔水层 泥岩 91 刘家沟组含水层 细砂岩、粗砂岩 416 灰白色、浅肉红色中细砂岩、粗砂岩与灰绿泥岩等厚互层;粗粒砂岩水平发育厚度不一,存在非均质性,砂岩以石英为主,长石次之,颗粒呈次圆状,泥质胶结,硬、脆、易碎。泥岩质纯,色不均,性较硬,断口平直;泥质粉砂岩质不纯,泥质含量较高,粉砂岩分布不均,断口粗糙。刘家沟组是以裂隙水和孔隙水为主的砂岩含水层,属于裂隙-孔隙双重含水介质,含水系统人工可塑造性较好,地下水补给条件差,水量贫乏,人工改造后的储水和导水性能良好;且刘家沟组与上覆含水层之间有良好的隔水层;孔隙率5%~7.4%,有效孔径范围6.3~12.1 μm 石千峰组含水层 细、中砂岩互层 35 钻孔仅揭露顶部一定深度 表 3 压水试验数据
Table 3 Statistical table of mine water reinjection tests
压水试验 持续时间/h 水压/ MPa 压水量/ (m3·h-1) 累计压水量/m3 吸水指数/ (m3·h-1·MPa-1) 1 31.0 8.5 98.0 3 038 11.52 2 25.0 8.0~8.5 51.0 1 284 6.18 3 24.5 6.2 68.2 1 665 11.00~13.64 5 74.5 6.3 53.8 4 008 8.54 6 72.5 6.7 71.8 5 205 10.72 7 75.5 6.8 103.3 7 747 15.20 注:第4次试验时停止压水,观测压力衰减情况。 表 4 矿井水水质处理前后对比分析
Table 4 Mine water quality analysis before and after treatment
处理前 处理后 项目 测试值 控制值 备注 项目 测试值 控制值 备注 项目 测试值 氨氮/(mg·L-1) 1.38 0.2 超标 pH值 7.35~7.87 6.50~8.50 pH值 8.05 硫化物/(mg·L-1) 0.005L 0.2 铅/(mg·L-1) 1.0×10-3 0.05 SS/(mg·L-1) 38.7 氰化物/(mg·L-1) 0.004L 0.05 砷/(mg·L-1) 2.6×10-3 0.05 COD/(mg·L-1) 9.7 总铬/(mg·L-1) 0.1 — 锌/(mg·L-1) 0.08~0.15 1.0 氟化物/(mg·L-1) 0.766 六价铬/(mg·L-1) 0.004L 0.05 铁/(mg·L-1) 0.29~0.63 0.3 超标 石油类/(mg·L-1) 0.06L 氟化物/(mg·L-1) 0.342 1.0 铜/(mg·L-1) 0.05 1.0 总汞/(μg·L-1) 0.04L 阴离子活性剂/(mg·L-1) 0.05L 0.3 锰/(mg·L-1) 0.39 0.1 超标 总砷/(μg·L-1) 0.3L 悬浮物/(mg·L-1) 84 汞/(mg·L-1) 8.3×10-3 0.001 总铬/(mg·L-1) 0.03L 化学需氧量/(mg·L-1) 25~118 15 超标 SO42- 1 080 — 总锰/(mg·L-1) 0.06 五日化学需氧量/(mg·L-1) 2.8 4 Cl-/(mg·L-1) 75.5 — 总锌/(mg·L-1) 0.02 石油类/(mg·L-1) 0.08 0.05 超标 NO3- 0.73 — 总镉/(μg·L-1) 0.025L 细菌总个数/(个·mL-1) 90 — Ca2+/(mg·L-1) 130 — 总铅/(μg·L-1) 0.25L 总硬度/(mg·L-1) 414.7 450 超标 Mg2+/(mg·L-1) 14 — 总铁/(mg·L-1) 0.01 总碱度(以CaCO3计, mg/L) 250 TDS/(mg·L-1) 2 036.7 — 六价铬/(mg·L-1) 0.006 浊度(NTU) 1.06 总α放射性/(Bq·L-1) 0.102 总β放射性/(Bq·L-1) 0.155 注:数据后边的L表示低于检出限。 项目 质量浓度/(mg·L-1) 项目 质量浓度/(mg·L-1) 项目 质量浓度/(mg·L-1) K+ 34.15 TDS 65 111.14 钡 124.1 Na+ 7 816 可溶SiO2 1.18 铬 0.031 9 Ca2+ 14 511.02 游离CO2 10.66 铅 0 Mg2+ 894.06 MH4+ 0 铍 0.008 7 Fe2+ 1.4 锂 1.909 锰 3.52 Fe3+ 0.84 锶 1 144 镍 0.074 3 HCO3- 25.22 钼 0.039 7 钴 0.010 6 CO32- 0 锌 0.029 2 钒 0.001 1 Cl- 39 739.84 硒 0.109 6 铝 0.184 5 SO42- 2 075.01 铜 0.291 5 银 0.035 2 F- 1.88 砷 0.014 3 硼酸盐 0.478 7 NO2- 0.002 镉 0.000 6 硫化物 14.84 NO3- 10 汞 0.000 2 -
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