GEOTHERMAL CHARACTERISTICS OF THE LIBIXIA ANTICLINE IN CHONGQING CITY
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摘要:
采用经验总结法和文献研究法,通过对沥鼻峡热储构造上的温泉和地热井勘查资料进行系统研究,发现沥鼻峡背斜具有典型的层状热储结构特征,是目前华蓥山复式背斜钻获地热水水温最低的热储构造,地热水以硫酸钙型水质为主,目前已知地热井和温泉具有水温普遍低于37℃和水量衰减较明显的特征.初步认为钻获地热水温低可能与构造有一定的关系.
Abstract:With experiential summary and literature research, through systematic study on the exploration data of hot springs and geothermal wells in Libixia geothermal reservoir structure, it is found that the Libixia anticline has the characteristics of typical layered thermal reservoir structure. The geothermal water is dominated by calcium sulfate type, with the presently lowest water temperature drilled in Huaying Mountain anticlinorium. The currently known geothermal wells and hot springs are generally lower than 37℃ in water temperature, with obvious attenuation in water amount. It is suggested that the low geothermal water temperature be related to the structure.
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Key words:
- Libixia anticline /
- geothermal geology /
- hot spring /
- geothermal reservoir /
- Chongqing City
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表 1 沥鼻峡背斜温泉(地热井)统计表
Table 1. Statistics of hot springs (geothermal wells) in Libixia anticline
钻井名称 构造部位 水温/℃ 水量及变化/(m3/d) 水化学类型 主要含水层位 矿化度/(g/L) 合川市盐井镇温泉 背斜西翼 27 0(8493.0) HCO·SO4-Ca 嘉陵江组 0.21 铜梁县陈家湾温泉 25(28) 420(1431) SO4-Ca·Mg 嘉陵江组 1.9 铜梁三谊石煤洞温泉 28 6000(8000) SO4-Ca 雷口坡组和嘉陵江四段 铜梁县西温泉 35 0(2000) SO4-Ca·Mg 嘉陵江组四段 铜梁西温泉地热井 35 0(2000) SO4-Ca·Mg 嘉陵江组四段 1.943 合川沥鼻峡地热井 32 未开发(80) Cl-Na 嘉陵江四段和三段 17.16 璧山凤湖仙山地热井 背斜东翼 37 水量有减小趋势(3886.96~4119.55) SO4-Ca 雷口坡和嘉陵江四段 1.29~1.398 注:括弧内数字为历史数据. 表 2 沥鼻峡背斜主要地热水井(泉)水化学特征
Table 2. Hydrochemical characteristics of the main geothermal wells (hot springs) in Libixia anticline
项目 璧山凤湖仙山地热井 合川区沥鼻峡地热井 铜梁县西温泉地热井 pH值 7.51~7.93 6.96~7.64 7.05 SO42-/(mg/L) 798.53~876.33 1247.51~1858.20 1122.40 Cl-/(mg/L) 3.18~5.59 2479.11 22.50~24.10 HCO3/(mg/L) 146.11~150.03 146.01~215.95 187.00~196.00 Ca2+/(mg/L) 276.48~308.72 470.94~559.03 424.43 Mg2+/(mg/L) 59.74~65.01 102.06~120.92 123.80~127.30 H2S/(mg/L) 0~0.11 28.49 0.52~0.53 偏硅酸/(mg/L) 25.54~26.32 49.14 37.40~39.10 偏硼酸/(mg/L) 0.26~1.01 112.88 1.38~3.43 氟/(mg/L) 2.25~2.40 2.75~4.05 2.00 锶/(mg/L) 6.74~11.468 24 11.50~15.00 总硬度/(mg/L) 2044.62~2149.72 17160 1943.72 地热水化学类型 SO4-Ca·Mg Cl-Na SO4-Ca 表 3 沥鼻峡背斜主要地热水井热储结构
Table 3. Thermal reservoir structure of the main geothermal wells in Libixia anticline
地热钻井 结构 地层岩性 钻井深度/m 地层厚度/m 合川沥鼻峡地热井 盖层 侏罗系沙泥岩 0~1680 1680 须家河砂岩 1680~2224 544 储层 雷口坡碳酸盐岩 2224~2300 76 嘉陵江酸盐岩 2300~2768 468 璧山凤湖仙山地热井 盖层 侏罗系沙泥岩 0~847 847 须家河砂岩 847~1202(1268~1313) 355(45) 储层 雷口坡碳酸盐岩 1202~1268(1313~1390) 66(77) 嘉陵江酸盐岩 1390~1919 529 璧山福禄镇地热井 盖层 侏罗系沙泥岩 0~1525 1525 须家河砂岩 1525~1937 412 储层 雷口坡碳酸盐岩嘉陵江酸盐岩 1937~2380.05 443.05 注:括弧内数据是断层造成的重复地层的厚度. -
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