Origin of KTB fluids and impact of pressure variations on the fluid chemistry during a long-term pumping test at KTB-VB

将研究KTB流体的来源以及在KTB先导钻孔（KTB-VB）进行长期泵送试验期间可能引起的流体化学变化。将反复分析所产生的地壳流体中的主要和微量元素（包括稀土元素和钇）以及选定的同位素（18 O/D）。将绘制KTB场址附近浅层和深层地下沃茨的同一套水文地球化学特性图;在每月抽水期间，将从具有最强深层流体特征的地下沃茨中重复取样。结合连续监测的参数，该数据集允许我们（i）确定钻井添加剂的污染程度，（ii）确定KTB流体的来源，（iii）检测和模拟泵送试验期间压力变化引起的流体化学可能的变化，以及（iv）对流体储层的不均匀性和性质和/或裂缝渗透率做出假设。

The origin of KTB fluids and possible pressure induced variations on the fluid chemistry during a long-term pumping test at the KTB pilot borehole (KTB-VB) will be investigated. The produced crustal fluid will be analysed repeatedly for major and trace elements (including REE and yttrium) as well as selected isotopes (18O/D). The same set of hydrogeochemical properties of shallow and deep ground waters in the vicinity of the KTB site will be mapped; during the active pumping period every month repeated samples will be taken from those ground waters with the strongest deep fluid signature. In combination with the continuously monitored parameters this data set allows us to (i) determine the degree of contamination by drilling additives, (ii) characterise the origin of the KTB fluid, (iii) detect and model possible changes of the fluid chemistry induced by pressure variations during the pumping test, and (iv) make assumptions about the inhomogeneity and nature of the fluid reservoir(s) and/or the fracture permeabilities.