Spectral Induced Polarization of Carbonates during Exposure to Reactive Gases under Reservoir Conditions (part II)

在储层条件下暴露于反应性气体期间碳酸盐的光谱诱导极化（第二部​​分）

• 批准号: 310586700
• 负责人: Dr.-Ing. Volker Herdegen
• 金额: --
• 依托单位: Institut für Geophysik und Geoinformatik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/310586700?language=en
• 关键词: Spectral; Induced; Polarization; Carbonates; during

The aim of the second phase of this project is the further experimental investigation and the model development of the spectral complex electrical properties of porous media with a carbonatic rock matrix during interaction with reactive gases (e.g. CO2) at elevated pressure and temperature. For this purpose, we continue to conduct a fundamental laboratory study in a well-proven cooperation of geophysicists and process engineers at the TU Freiberg. Researchers from the TU Berlin and the University of Barcelona support the project.Carbonatic reservoirs have come into focus since they host huge resources of oil and natural gas and, consequently, are also targets for enhanced oil recovery EOR and carbon dioxide sequestration endeavors. However, carbonates provide great challenges to the geosciences due to their extremely heterogeneous pore space and the reactive nature of the carbonatic matrix. Electromagnetic (EM) methods have proven to be of great value as monitoring techniques as they are specifically sensitive to the pore content. Although the monitoring tasks involved are the same for both siliceous and carbonatic reservoirs, the petrophysical knowledge of the electrical properties of carbonates is still rather crude.During the first phase of the project, we have overall demonstrated and systematically investigated the petrophysical properties of solid and crushed carbonate rocks. We have developed a fundamental system understanding and the necessary tools to tackle the high pressure reaction kinetics of carbonate rocks. The already retrieved huge data set allows for assessing the influence of pore space and surface properties on the electrical conductivity of carbonates. Based on these results we chose a suitable carbonate and particle size and started the high-pressure experiments as planned.In the second project phase we will continue to systematically investigate the observed effects under laboratory conditions using the spectral induced polarization (SIP) method and reaction kinetics measurements with a high-pressure magnetic suspension balance at temperatures between 15°C and 70°C and pressures between 0.5 and 30 MPa. The low pressure/ low temperature regime covers shallow aquifers, high pressure/ temperature regimes represent reservoirs down to 2500 – 3000 m depth. Finally we aim at the development of a model-based relation between SIP and reaction kinetics during long-term surface alteration for carbonates under CO2 and reservoir conditions.The overall project will contribute important data to the fundamental understanding of SIP in carbonates and the interaction of reactive gases (especially CO2) with reactive rock matrices. Due to our unique approach of using crushed samples we reduce the complexity of the system and focus on the electro-chemical interactions, their electrical manifestation, and model description. This also allows for the assessment of monitoring options with EM methods in carbonatic reservoirs.

该项目的第二阶段的目的是进一步的实验研究和模型开发的光谱复杂的电性能的多孔介质与碳酸岩基质在与反应气体（如二氧化碳）在高压和高温下相互作用。为此，我们继续在弗赖贝格工业大学的化学家和工艺工程师的良好合作下进行基础实验室研究。来自柏林工业大学和巴塞罗那大学的研究人员支持该项目。碳酸盐岩储层已成为焦点，因为它们拥有巨大的石油和天然气资源，因此也是提高石油采收率EOR和二氧化碳封存工作的目标。然而，碳酸盐岩由于其极不均匀的孔隙空间和碳酸盐基质的活性性质，给地球科学带来了巨大的挑战。电磁（EM）方法已被证明是非常有价值的监测技术，因为它们是特别敏感的孔隙含量。尽管硅质和碳酸盐岩储层的监测任务相同，但碳酸盐岩电性的岩石物理知识仍然相当粗糙，在项目的第一阶段，我们对固体和破碎碳酸盐岩的岩石物理性质进行了全面论证和系统研究。我们已经开发了一个基本的系统理解和必要的工具来解决碳酸盐岩的高压反应动力学。已经检索到的庞大数据集允许评估孔隙空间和表面性质对碳酸盐电导率的影响。根据这些结果，我们选择了合适的碳酸盐和颗粒尺寸，并按计划开始了高压实验。在第二个项目阶段，我们将继续系统地研究在实验室条件下观察到的影响，使用光谱激发极化（SIP）方法和反应动力学测量，压力磁悬浮天平，温度在15°C和70°C之间，压力在0.5和30 MPa之间。低压/低温区涵盖浅层含水层，高压/高温区代表2500 - 3000米深的储层。最后，我们的目标是在CO2和储层条件下，在碳酸盐岩的长期表面蚀变过程中，SIP和反应动力学之间基于模型的关系的发展。整个项目将为碳酸盐岩中SIP的基本理解以及活性气体（特别是CO2）与活性岩石基质的相互作用提供重要数据。由于我们使用粉碎样品的独特方法，我们降低了系统的复杂性，并专注于电化学相互作用，其电气表现和模型描述。这也允许在碳酸盐岩储层中使用EM方法评估监测选项。