Investigation of Dissolved Carbon Dioxide Injection Into Paleozoic Aged Geothermal Reservoir Rock

Date

2023-10-30

Author

Aydın, Hakkı

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The scientific consensus is that greenhouse gas emissions are causing global climate change. Carbon dioxide (CO2) is the main greenhouse gas, and it is produced by a variety of chemical reactions and combustion processes. One potential method for CO2 disposal is reinjection into water-bearing reservoirs. Geothermal reservoirs have been identified as promising candidates for this purpose. A number of studies have been conducted on CO2 sequestration in different types of formations. However, more research is needed to understand the changes that CO2 injection can cause to geothermal fluid chemistry and reservoir rock properties. Several small-scale experiments were conducted to investigate the effects of CO2-dissolved brine injection using core samples from the Kızıldere geothermal reservoir at depths of 1900 m and 3000 m. The batch reactor experiments were conducted at different temperatures and pressures. The interaction between CO2-dissolved brine and reservoir rock was simulated using the PHREEQC and TOUGHREACT, which are based on equilibrium and kinetic modeling. Mineral precipitations and dissolutions were determined using X-ray fluorescence (XRF), X-ray diffraction (XRD), andvi scanning electron microscopy (SEM) measurements. Major anions and cations were measured using ion chromatography (IC) and inductively coupled plasma (ICP) spectroscopy. The results of the batch reactor experiments showed that CO2- dissolved brine injection can cause significant changes to geothermal fluid chemistry and reservoir rock properties. These changes include mineral precipitation, dissolution, and alteration such as magnesite, kaolinite, feldspar, biotite, siderite, and dolomite. This study provides valuable insights into the effects of CO2 injection on geothermal fluid chemistry and reservoir rock properties. The findings of this study can be used to design and operation field-scale CO2 sequestration projects in geothermal reservoirs.

Subject Keywords

Noncondensable Gases, Geothermal Energy, Reactive Transport, Carbon Dioxide, Sequestration

URI

https://hdl.handle.net/11511/106342

Collections

Graduate School of Natural and Applied Sciences, Thesis