Researches on the reinjection of Dongli Lake bedrock reservoir in Binhai New Area, Tianjin
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摘要:
天津市滨海新区东丽湖地区雾迷山组热储层为该区主要开发利用热储层，共有11眼地热井，由于集中开发利用，静水位埋深以每年3m速度下降。为了缓解水位下降，目前利用地热流体尾水进行回灌，水位埋深下降仍然较快。东丽湖地区有丰富的地表水水源，为增加回灌量，在丰水期利用处理后的湖水开展集中回灌，建成集中回灌系统。为研究集中回灌后研究区的动力场和温度场特征，在本区开凿1眼回灌井，进行回灌试验，确定该井的最大回灌率为152m3/h。建立研究区的数值模型，模拟供暖季和非供暖季2种回灌方式下的动力场和温度场特征。供暖季回灌量为30×104m3/a，平均到供暖季120d，回灌水温20℃，自然回灌方式；非供暖季采用湖水回灌，回灌量为40×104m3/a，平均到丰水期120d，回灌水温20℃，自然回灌方式。在无湖水回灌和有湖水回灌条件下，预测1a和5a后研究区的动力场和温度场特征，结果表明，增加湖水回灌可减缓热储层压力下降速率，对温度场不会产生明显影响。
Abstract:The Wumishan Formation is the main development and utilization reservoir in the Donglihu district of Binhai New Ar-ea, Tianjin. There are 11 geothermal wells, and static level falls by the depth of 3m annaully due to the concentrated development and utilization. For the purpose of alleviating water level falling, geothermal fluid waste water has been used for reinjection; never-theless, the falling of the water level remains relatively fast. The Dongli Lake area is rich in surface water, the treated lake water is used for reinjection to increase the amount of reinjection in rich water period, and the concentrated reinjection system has been built in this area. A reinjection well was digged to carry out reinjection test and the largest reinjection of the well is 152m3/h. TOUGH2.0 software is adopted to establish the numerical model in the study area and simulate dynamic field and temperature field characteristics of two kinds of reinjection mode under the condition of the heating period and non-heating period. Reinjection rate is 30×104m3/a in the heating period averagely for 120 days, the reinjection water temperature is 20℃ and the natural reinjection modde is adopted. The reinjection rate is 40×104m3/a in the non-heating period for averagely 120 days, the reinjection water tem-perature is 20℃ and the natural recharge mode is adopted. This paper forecasts the dynamic field and temperature field characteris-tics of the study area under the conditions of the absence of lake water reinjection and the existence of water injection for 1 year and 5 years. The results show that increasing lake water reinjection can reduce heat reservoir pressure dropping rate and has no sig-nificant influence on the temperature field.
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Key words:
- Tianjin /
- geothermal resources /
- reinjection /
- simulation and predication
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表 1 研究区热储特征
Table 1. Thermal reservoir characteristics in the study area
热储层 顶板埋深
/m厚度
/m单井涌水量
/(m3· h-1)温度/℃ 矿化度
/(mg· L-1)明化镇组 280~320 950 30~100 45~75 700~2000 馆陶组 1420~1530 360~440 50~80 65~75 1600~1800 奥陶系 1674~2630 22~419 85 96~99 1600~2800 寒武系 1550~2470 80~300 80~120 75~96 1700 雾迷山组 1600~2000 500~600 80~120 96~102 1600~2200 
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表 2 回灌试验记录
Table 2. Reinjection test record
试验组别 稳定灌量/(m3· h-1) 回灌水温/℃ 稳定动水位/m 稳定时间/h 第一阶段 60 21.5 107.6 19 第二阶段 80 20.6 96.6 30 第三阶段 100 19.8 77.6 100 第四阶段 120 19.2 48.9 120 第五阶段 140 14 20 60
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表 3 湖水回灌试验情况
Table 3. Reinjection test of lake water
落程 水量/(m3· h-1) 动水位/m 持续时间/h 水温/℃ 静水位/m 第一落程 60 107.6 21 21.5 113.58
（20℃液面）第二落程 80 96.6 49 20.6 第三落程 100 77.6 142 19.8 第四落程 120 48.9 229 19.2 第五落程 140 20 81 14
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