Integrity analysis of CO2 storage sites concerning geochemical-geomechanical interactions in saline aquifers

Arshad Raza, Raoof Gholami, Mohammad Sarmadivaleh, Nathan Tarom, Reza Rezaee, Chua Han Bing, Ramasamy Nagarajan, Mohamed Ali Hamid, Henry Elochukwu

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

A systematic and careful analysis of changes in the magnitude of geomechanical parameters is essential to mitigate the risk of leakage from CO2 storage sites. However, depending on rocks and storage sites, these changes might be different due to chemical reactions taking place, especially when it comes to saline aquifers. There have only been few studies carried out in the past to evaluate the maximum sustained pressure of rocks being exposed to these chemical interactions. However, more studies are still required to evaluate the strength of the storage medium or seals when different kinds of rocks and fluids (fresh water or brine) are included in the hostile environment of a storage site. In this paper, attempts were made to evaluate changes in the variation of geomechanical parameters of the Berea sandstone during and after the injection of supercritical CO2 in a short period of time. The results obtained indicated that the presence of brine in the pore space during injection enhances the severity of geochemical reactions, causing reductions in the magnitudes of elastic parameters including shear modulus. Having a good look into the SEM images of the sample before and after exposure to scCO2 indicated that these changes can be attributed to the dissolution/fracturing of calcite and clays in the matrix of the sample. Although findings were provided based on the pulse measurements tests, more studies are required to have a deeper understanding as to how geochemical reactions may cause difficulties during and after injection into a storage site.

Original languageEnglish
Pages (from-to)224-240
Number of pages17
JournalJournal of Natural Gas Science and Engineering
Volume36
Issue numberPart A
Early online date13 Oct 2016
DOIs
Publication statusPublished - Nov 2016

Keywords

  • CO storage
  • Geochemical interactions
  • Geomechanics
  • Pressure buildup
  • Reservoir integrity

ASJC Scopus subject areas

  • Energy Engineering and Power Technology

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