| 张芬娜,贾志,徐明,阮传侠,王冰,岳冬冬.天津市山岭子地热田热流体锶同位素演化及指示意义[J].矿产勘查,2025,16(3):574-583 |
| 天津市山岭子地热田热流体锶同位素演化及指示意义 |
| The evolution and indicating significance of strontium isotope in Shanlingzi geothermal field of Tianjin |
| 投稿时间：2024-06-14 |
| DOI：10.20008/j.kckc.202503014 |
| 中文关键词: 地热流体 锶同位素演化 起源成因 补给来源 山岭子 |
| 英文关键词: geothermal fluid strontium isotope evolution source and formation mechanism sources of supply Shanlingzi |
| 基金项目:本文受国家自然科学基金项目“雾迷山组热储地热资源采灌平衡研究”(41877208)资助。 |
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| 中文摘要: |
| 在天津山岭子地区，深部地热流体的成因演化一直是学术界关注的焦点，直接关系着天津市山岭子地热田地热资源的可持续开发利用，对于推动天津地区乃至整个京津冀地区地热资源的合理开发利用有着重大意义。本文检测了研究区 33组不同储层的地热流体水样，分析了地热流体中 Sr2+浓度与 87Sr/86Sr特征关系、锶同位素与水文地球化学组分含量以及氘氧的相关关系，并结合山岭子地热田的地质构造特征，对山岭子地热田深部热储流体的成因、补给来源、路径及混合作用进行了研究。结果表明:研究区热储流体的 Sr浓度和 87Sr/86Sr值在平面上东南高西北低，即位于沧东断裂附近 Sr2+浓度和 87Sr/86Sr值高，随着距沧东断裂的距离越远 Sr2+浓度和 87Sr/86Sr值越低；垂向上 Sr2+浓度和 87Sr/86Sr值随着热储层埋藏深度的增加而升高。研究区内地热流体由天津北部蓟县山区的大气降水入渗经过较远距离径流后补给形成的，位于沧东断裂附近的明化镇组、馆陶组、奥陶系和雾迷山组地热流体之间存在着水力联系，沧东断裂是地热流体运移的通道。研究区内地热流体的热储环境为半封闭性，存在一定水岩作用的古溶滤水。 |
| 英文摘要: |
| In the Tianjin Shanlingzi region, the genesis and evolution of deep geothermal fluids have been a fo-cal point of academic attention, directly impacting the sustainable development and utilization of geothermal re-sources in the Shanlingzi geothermal field, Tianjin. This study analyzed water samples from 33 different reservoirsin the research area, examining the relationship between Sr2+ concentration and 87Sr/86Sr ratios in geothermal fluids,as well as the correlations between strontium isotopes and hydrogeochemical components and deuterium-oxygen iso-tope ratios. Combining these analyses with the geological structural characteristics of the Shanlingzi geothermalfield, the study investigated the genesis, recharge sources, pathways, and mixing processes of deep geothermal reser-voir fluids in the Shanlingzi geothermal field. The results indicate that Sr concentrations and 87Sr/86Sr ratios in the thermal reservoir fluids are higher in the southeast and lower in the northwest, with higher Sr2+ concentrations and 87Sr/86Sr ratios near the Cangdong Fault and decreasing values with increasing distance from the fault. Vertically, Sr2+ concentrations and 87Sr/86Sr ratios increase with the depth of the geothermal reservoir. The geothermal fluidswithin the research area are formed by atmospheric precipitation infiltration from the northern Jixian mountainousarea of Tianjin, traveling over long distances before recharging. There is hydraulic connectivity between the Ming-huazhen Formation, Guantao Formation, Ordovician System, and Wumishan Formation geothermal fluids near theCangdong Fault, with the Cangdong Fault serving as a conduit for geothermal fluid migration. The geothermal reser-voir environment in the research area is semi-closed, with ancient leached water exhibiting some degree of water-rock interaction. |
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