单井多层位水温微动态初步研究

基于海口ZK26井的水温观测环境以及近10年的观测资料, 分析-153 m、 -336 m、 -510 m水温的频谱特征, 探讨单井各层位水温丰富的微动态信息, 对比观测结果表明: 海口ZK26深井不同层位的水温表现出不同的微动态特征, 与观测层位的频谱特征、 水文地质条件、 水力性质等有着密切的联系。 -153 m位于含水层负梯度区, 主要处于低频段, 而且高低频噪声较弱, 信噪比较高, 可以表现出较清晰的微动态特征, 如水温海潮效应、 震前异常、 同震效应以及震后效应; -336 m与-510 m水温位于非含水层, 主要处于高频段, 并且背景噪声较强, 水温微动态信息较弱。

Preliminary Study on Micro-behaviors of Water Temperature at Different Layers in the Same Well

On the basis of the monitoring conditions of water temperature and comparative observation data for nearly 10 years of water temperature in the Haikou ZK26 well, the spectrum characteristics of water temperatures which are in different layers(-153 m, -336 m, -510 m) are analyzed, and the micro-behaviors are studied in different observation layers. The results of comparative observation showed that, Haikou ZK26 well temperature in different layers display different micro-behavior characteristics because of the different spectrum characteristics, hydrological conditions and hydraulic properties. The aquifer layer of -153 m locates in negative gradient, mainly in the low frequency band and the noise is weak, so the -153 m temperature show clear micro-dynamic characteristics, such as tidal effects, earthquake precursor and post-seismic; while the non-aquifer layers -336 m and -510 m are mainly in the high frequency band and the noises are strong with poor micro-dynamic information.