Hydrochemical and hydraulic properties of the continental upper crust at the KTB site

计划在KTB 4.0 km深的先导孔中进行为期一年的恒速抽水试验。还将监测先导钻孔和9.1公里深的主孔中的地下水位波动。大量数据(抽水率、地下水位/压力、温度、盐度/电导率、水样……)将变得可用，有些甚至是在线的。拟议项目的第一个目标是确定水流系统(含水层模型的类型)。根据推导出的水力模型，得出水力特性(如：导水率、蓄水系数、裂缝长度/宽度/孔径、裂缝和基质的渗透率等)。描述了KTB引导孔和主孔附近结晶基岩的性质。预计测试半径的长度约为1000米。拟议的项目还打算确定两个洞(深度相差5.1公里)之间的水力连接程度。在解释水力数据时，将需要其他信息，如水分析。第二个主要目标是利用KTB流体的化学数据模拟水-岩相互作用(WRI)过程。特别是，将使用化学数据的时间序列来模拟动力学和依赖时间的过程。我们还希望看到一些“新鲜、干净”的结晶基底水的突破，以及储存在主孔及其周围的流体所产生的另一项突破。

A constant rate pumping test of one year duration is planed to be carried out in the 4.0 km deep pilot hole of KTB. Watertable fluctuations in the pilot borehole and in the 9.1 km deep main borehole will be monitored as well. A wealth of data (pumping rate, watertable/ pressure, temperature, salinity/electrical conductivity, water samples,....) will become available, some even online. The first objective of the proposed project is to determine the flow system (type of aquifer model). From this deduced hydraulic model follow the hydraulic characteristics (such as: transmissivity, storage coefficient, fracture lengt/ width/aperture, permeability of fractures and matrix,....) describing the properties of the crystalline basement rocks in vicinity of the KTB pilot- and main hole. The length of the expect test radius is some 1000 m. The proposed project intends also to determine the degree of the hydraulic connection between the two holes (having a depth difference of 5.1 km). Additional information, such as water analyses, will be needed in interpreting the hydraulic data. A second major objective is the modelling of water-rock interaction (WRI) processes using the chemical data of KTB fluids. In particular the time series of chemical data will be used to model the kinetic and time dependent processes. We expect as well to see some breakthroughs of "fresh, clean" crystalline basement water and another breakthrough resulting from fluid stored in the main hole and its surrounding.