Dissolved species are widely used to determine the degree of fluid mixing and fluid-rock reactions in geological reservoirs where differences are observed in groundwater chemistry. Likewise these components can be added artificially to injection waters to act as aqueous phase tracers in field tests. Here we report results from two field studies where aqueous phase tracers were applied. The first field site was located in the Darling Basin of NSW where new exploration wells were drilled to determine if suitable CO₂ storage reservoirs could be identified. In this field study fluorescein was continuously added to a drill mud used during the drilling of an exploration well. After drilling the well, a wireline tool was used to collect formation water from different depths in the well and the residual fluorescein concentration was used to determine contamination of formation waters by drill mud. The composition of dissolved solids in the in situ formation water samples were close to 100% of those found in the final drill mud composition, whereas, c. 70–83% of the drill mud fluorescein concentration was observed in the in situ water samples. This indicated significant drill mud contamination of samples collected by the wireline tool, and potential non-conservative behavior of the fluorescein. The second field site was located at the CO2CRC Otway field site near Nirranda South in Victoria, Australia. Here, a range of aqueous phase tracers (fluorescein, Na⁺, Cl⁻, Br⁻, Sr²⁺ and Li⁺) were added to a CO₂-saturated injection water and analysed in the back-produced water of a push-pull experiment (Otway 2B Extension) in order to determine the degree of mixing between injection and formation water. Fluorescein behaved in a non-conservative manner under the mild acidic conditions (in situ pH = 4.5), most likely due to adsorption to mineral surfaces. Scatter in the Na⁺ and Cl⁻ concentrations made their interpretation problematic, while some loss of Sr²⁺ is inferred possibly involving exchange with minerals in the reservoir. In contrast, Br⁻ and Li⁺ showed conservative behavior and are recommended for future tracer studies in reservoirs where pH is variable.

溶解物质被广泛用于确定地质化学储层中流体化学混合程度和流体-岩石反应的程度，在这些储层中地下水化学成分存在差异。同样，这些组分也可以人工添加到注入水中，以在现场测试中用作水相示踪剂。在这里，我们报告了两个应用水相示踪剂的现场研究的结果。第一个现场位于新南威尔士州的达令盆地，在那里钻了新的勘探井，以确定是否合适的CO ₂可以确定存储库。在该现场研究中，将荧光素连续添加到勘探井钻探过程中使用的钻探泥浆中。钻完井后，使用电缆工具收集井中不同深度的地层水，并使用残留的荧光素浓度确定钻探泥浆对地层水的污染。原位地层水样品中的溶解固体成分接近最终钻探泥浆成分中溶解固体成分的100％，而c。在原位水样中观察到了70-83％的钻探泥浆荧光素浓度。这表明电缆工具收集的样品对钻探泥浆造成了严重污染，并且荧光素具有潜在的非保守特性。第二个现场位于澳大利亚维多利亚州Nirranda South附近的CO2CRC Otway现场。在这里，一系列水相示踪剂（荧光素，Na⁺，氯^- ，溴^-，SR ²⁺和Li ⁺）加入到一个CO ₂以确定的程度-饱和喷射水和在推挽实验（奥特韦2B扩展）的背面副产的水进行分析注入水和地层水之间的混合。荧光素在温和的酸性条件下（原位pH = 4.5）以非保守的方式起作用，这很可能是由于吸附到矿物表面上造成的。散在的Na ⁺和Cl ^-的浓度作出他们的解释问题，而高级一些损失²⁺推断可能涉及与在油藏矿物交流。相比之下，溴^-李⁺显示出保守的行为，建议将来在pH值可变的储层中进行示踪剂研究。