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

KTB-VB 长期泵送测试期间 KTB 流体的来源以及压力变化对流体化学的影响

• 批准号: 5363119
• 负责人: Dr. Heiko Woith
• 金额: --
• 依托单位: Sektion 4.3: Klimadynamik und Landschaftsentwicklung
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2002
• 资助国家: 德国
• 起止时间: 2001-12-31 至 2005-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5363119?language=en
• 关键词: Origin; KTB; fluids; impact; pressure

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.

将研究 KTB 导向钻孔 (KTB-VB) 的长期泵送测试期间 KTB 流体的来源以及可能的压力引起的流体化学变化。所产生的地壳流体将被反复分析主量元素和微量元素（包括稀土元素和钇）以及选定的同位素（18O/D）。将绘制 KTB 地点附近浅层和深层地下水的同一套水文地球化学特性图；在每月的活跃抽水期间，将从具有最强深层流体特征的地下水中重复取样。结合连续监测的参数，该数据集使我们能够 (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引起的流体化学可能发生的变化，以及 (iv) 对流体储层和/或裂缝的不均匀性和性质做出假设 渗透率。