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

在KTB先导井(KTB-VB)的长期泵送试验期间，将调查KTB流体的来源和可能引起的流体化学的压力变化。将反复分析产生的地壳流体中的常量和微量元素(包括稀土和Y)以及选定的同位素(18O/D)。将绘制KTB厂址附近浅层和深层地下水的同一套水文地球化学性质的地图；在活跃抽水期间，将从深部流体特征最强的地下水中重复取样。结合持续监测的参数，此数据集使我们能够(I)确定钻井添加剂的污染程度，(Ii)表征KTB流体的来源，(Iii)检测并模拟泵送测试期间压力变化导致的流体化学可能发生的变化，以及(Iv)对流体储层的非均质性和性质(S)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.