Possible Continuous Vertical Water Leakage of Deep Aquifer: Records from a Deep Well in Tianjin Province, North China
Possible Continuous Vertical Water Leakage of Deep Aquifer: Records from a Deep Well in Tianjin Province, North China
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DOI：
10.1155/2022/4419310
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发表时间：
2022-11
期刊：
影响因子：
1.7
通讯作者：
Yan Zhang;Xiaolong Sun;Tianming Huang;S. Qi;L. Fu;Qiu-Ye Yang;Junhua Hu;B. Zheng;Wang Zhang
中科院分区：
文献类型：
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作者：
Yan Zhang;Xiaolong Sun;Tianming Huang;S. Qi;L. Fu;Qiu-Ye Yang;Junhua Hu;B. Zheng;Wang Zhang
众所周知，有价值的氦和其他天然气的储存需要厚的封闭良好的弱透水层。与此同时，深含水层是封闭的这一假设最明显的证据是，人们普遍把深含水层当作有毒废物和二氧化碳的储存地。由于M2潮波的负相移，华北地台高村深井（~3500 m）以前被认为是封闭较好的。然而，高村井水位持续下降了约40年，没有同震变化，也没有可解释的机制。本研究创新性地发现，高村井即使埋深约3500 m，上覆有较厚的致密泥岩，但在假设观测含水层底部无渗漏，且无直接抽水或开采的情况下，仍可能因弱透水层断裂引起的垂向渗漏而持续渗漏约40年。同时，首次对潮汐响应和水位气压响应的渗漏模型进行了详细系统的比较，结果表明渗漏结果是一致的，而微小的差异主要是由频率差异引起的。分析了两种模型的优缺点。最后但并非最不重要的是，地下流体泄漏可能频繁发生，这在世界范围内变得越来越紧迫，因为这也可能与地表来源的污染、有毒废物掩埋以及天然气储层的掩埋和勘探有关。
It is well known that the storage of the valuable helium and other natural gases needs thick well-confined aquitards. Meanwhile, the assumption that deep aquifers are confined is most evident from the wide practices of targeting deep aquifers as the storage of toxic wastes and CO2. With the negative phase shifts of the M2 tidal wave, previously, deep Gaocun well (~3500 m) in the North China Platform is assumed to be confined fairly well. However, water level of the Gaocun well has been continuously decreasing for ~40 years without coseismic variations and without explainable mechanism. In this study, innovatively, we find that even buried in ~3500 meters deep, and covered by thick compact mudstones, the aquifer of well Gaocun is calculated to be continuously leaking for ~40 years probably induced by the vertical leakage incurred by aquitard fractures, which is under the assumptions of the none-leaking bottom layer and none direct pumping or exploiting in the observation aquifer layer. Meanwhile, for the first time, we did a detailed systematic comparison between the leaky models of the tidal response and the barometric response of water level, which indicate a consistency leaky result, and the minor difference mainly induced by the frequency differences. Merits and demerits of both models are also analyzed. Last but not least, underground fluid leakages might frequently occur, which are becoming increasingly worldwide urgent since that might also be related with surface sourced contaminations, toxic waste burials, and burial and exploration of the natural gas reservoirs.