Shale Electrokinetic Property and Colloidal Stability: Potential for Subsurface CO2 Storage

Research output: Contribution to journalArticlepeer-review

Abstract

Shale reservoirs and their capacity to store absorbed greenhouse gases, mainly CO2, have come to the forefront of scientific discourse as a result of the global effort to alleviate concerns about the increase in global temperature. Many nations and companies have started several programs to analyze the security and viability of storage to do this. There is a dearth of information about shale’s electrokinetic properties despite the vast amount of literature on shale exploration, its composition, and enhanced gas recovery from shale. This characteristic determines how the shale sample reacts to various fluids, its wetting state, and how it preferentially reacts with some gases (CO2 over CH4). Eagle Ford shale sample’s electrokinetic properties (surface charge and colloidal stability) are presented in connection to its capacity as a CO2 storage system for the first time. Zeta potential measurements were used to determine this, and the impact of salinity in freshwater and marine environments was examined. Results indicate that the Eagle Ford shale sample is colloidally unstable and negatively charged in both marine and freshwater environments. Furthermore, the sample is a strong candidate for the release of cations for CO2 mineralization due to its colloidal stability. The sample’s mineralogy, total organic content, and the environment pH, on the other hand, determine its surface charge and colloidal stability. Furthermore, the results demonstrate that the Eagle Ford shale sample’s colloidal stability is enhanced by continuous injection of CO2-rich fluid. As a result, injection reduces the tendency of cations to liberate for CO2 mineralization. However, the electrokinetic properties are unaffected by the injection time scale. Eagle Ford shale’s electrokinetic properties presented in this study can be used to understand not only the potential and security of CO2 storage but also the various behaviors of shales and other minerals during CO2 mineralization.

Original languageEnglish
Pages (from-to)1111-1125
Number of pages15
JournalEnergy and Fuels
Volume38
Issue number2
DOIs
StatePublished - 18 Jan 2024

Bibliographical note

Publisher Copyright:
© 2023 American Chemical Society

ASJC Scopus subject areas

  • General Chemical Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

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