地震地下流体研究是地震学与水文地质的交叉、热点课题。地震波引起水位变化的机理具有复杂性和不确定性，近期研究发现低孔-低渗页岩对同震流体运移及潮汐响应有较大影响。针对上述问题，本项目拟基于近年来发生的大地震引起我国华北地下流体观测台站的水位变化数据，采用实地台站观测、渗流层岩性物性分析与地震数值模拟相结合的方法，从三个方面研究不同岩性多孔岩石中地震波引起流体运移变化及潮汐响应特征：(1) 应用固体潮效应分析含水层物性同震变化机理，确定水位-应变-含水层参数的时间序列关系；(2) 分析各井孔观测含水层的岩性物性特征，探究利用同震流体运移及潮汐响应特征反推地下介质岩性（低孔-低渗页岩）性质的可能性；(3) 开展多孔介质地震波传播数值模拟，分析不同岩性介质中（砂岩与页岩）流体的运移特征。本课题对深入理解地震导致地下流体运移机理、低孔-低渗页岩同震流体响应特征、以及孔隙压变化诱发地震等具有重要意义。

This research is a cross subject of seismology and hydrogeology and it has been a subject of intense interest. The mechanism of water level variations induced by seismic waves is complex and uncertain, in addition, our latest studies indicate that shale (low porosity and permeability) will have influence on co-seismic fluid migration and tidal response. According to the above issues, this research will focus on the study of the characteristic of underground-fluid migration and tidal response induced by seismic waves in different lithologic porous rocks, based on the water level data of the groundwater observation stations in North China induced by large earthquakes happened in recent years. Integrated approaches will be employed, including in-situ observation of hydrogeology and seismology, lithologic property and physical property analyses of seepage stratum, and seismic numerical modeling. It will be implemented from three aspects: (1) Analyze the co-seismic change mechanism of physical properties of aquifers based on the computation and analysis of tidal effect of groundwater, and finally to get the relations among water level, volume strain, and aquifer parameters; (2) Analyze the lithology characteristics and the physical properties about the observation aquifers of each well, and explore the possibility of deducing the lithology of the underground medium (low porosity−low permeability shale) based on the characteristics of co-seismic groundwater migration and tidal response; (3) To do the numerical modeling of the propagation of seismic waves in porous rocks. To analyze the characteristic of underground-fluid migration in different lithologic rock medium (sandstone and shale). This study will have significant meanings, and will be essential for the thorough comprehension of the mechanism of earthquake induced groundwater migration, the characteristic of the co-seismic fluid responses in low porosity/ permeability shale, and earthquakes induced by the variations of pore-pressure.