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

计划在KTB 4.0km深的先导孔中进行为期一年的恒流量抽水试验。还将监测先导钻孔和9.1公里深的主钻孔中的地下水位波动。丰富的数据（抽水率、地下水位/压力、温度、盐度/电导率、水样等）将变得可用，有些甚至在线。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）。从推导的水力模型出发，得出了该油藏的水力特性（如：渗透率、储集系数、裂缝宽度/孔径、裂缝和基质的渗透率等）。描述了KTB先导孔和主孔附近结晶基底岩石的性质。预计试验半径为1000米左右。拟议项目还打算确定两个孔之间的水力连接程度（深度差为5.1 km）。在解释水力数据时，还需要水分析等其他资料。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。特别是时间序列的化学数据将被用来模拟动力学和时间依赖的过程。我们也期望看到一些“新鲜、干净”的结晶基底水的突破，以及另一个由储存在主孔及其周围的流体引起的突破。

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.