基于流体的潮汐-气压响应特征研究富含页岩含水层的渗流特性

流体的潮汐和气压响应被广泛应用于研究含水层的性质，特别是分析地下流体对地震的响应过程。但含水层岩性对潮汐-气压响应特征的影响目前尚未得到足够的关注，特别是关于页岩的影响研究较少。本申请基于地震地下流体观测资料，拟采用井水位的潮汐响应进行含水层中流体水平向或垂直向流动的判别；采用流体的气压响应分析井含水层的封闭性和井孔的储水性能。从而对比分析砂岩含水层和富含页岩含水层的流体潮汐-气压响应特征，着重研究不同岩性（砂岩、页岩）观测含水层对应井孔的水力响应模型，进而计算含水层的渗透率，探究观测含水层中页岩含量变化对流体潮汐-气压响应的影响规律，期待将响应特征应用于含水层中页岩岩性的识别。此外，页岩气开发过程中产生的大量有毒废水（压裂液）会被注入开发区域附近的地下深部蓄水层，本项目的潜在应用是为有毒废水进行持续性渗流监测提供依据和理论方法支持。

Tidal and barometric water-level responses in wells have been widely used to study the properties of aquifers and, in particular, the response of groundwater to earthquakes. However, the effect of lithology on such responses has not received much attention, especially the influence of shale in the aquifer on the responses has rarely been studied. In this study, based on groundwater observation data, we intend to judge whether horizontal flow or vertical flow occurs in the observed aquifer in tandem with the tidal responses of water-level; while we use the barometric responses of water-level to analyze the confinement and storativity of well aquifer. Here, we compare the tidal and barometric response characteristics of water level for wells with shale or sandstone in the aquifer. We especially focus on the study of different hydraulic response models for different wells with shale or with sandstone in the aquifer, so that to calculate the permeability of aquifer based on different models; and also to detect the influence of increased shale content in the aquifer on the tidal and barometric response characteristics, and then using the response characteristics, we intend to infer whether there is shale in an observed aquifer. In addition, this computational and analytical process might also provide a method to detect and continuously monitor groundwater leakage near the in-situ area of shale gas exploration, where the deep injection of wastewater has been ongoing.