In-situ X-ray micro-computed tomography imaging of the microstructural changes in water-bearing medium rank coal by supercritical CO2 flooding

Yihuai Zhang, Maxim Lebedev, Yu Jing, Hongyan Yu, Stefan Iglauer

Research output: Contribution to journalArticle

11 Citations (Scopus)
12 Downloads (Pure)

Abstract

Carbon dioxide geosequestration into deep unmineable coal seams is a technique which can mitigate anthropogenic greenhouse gas emissions. However, coal composition is always complex, and some minerals such as calcite chemically react when exposed to the acidic environment (which is created by scCO2 mixing with formation water). These reactive transport processes are still poorly understood. We thus imaged a water-bearing heterogeneous coal (calcite rich) core before and after scCO2 injection in-situ at high resolution (3.43 μm) in 3D via X-ray micro-tomography. Indeed, the calcite- fusinite mix phase was partially dissolved, and absolute porosity and connectivity significantly increased. We thus suggest that such a process could be used as an acidizing method for enhanced coal bed methane (ECBM) production, thus significantly improving the permeability performance, CO2 injectivity and the associated methane permeability.
Original languageEnglish
Pages (from-to)28-35
Number of pages8
JournalInternational Journal of Coal Geology
Volume203
Early online date14 Jan 2019
DOIs
Publication statusPublished - 2 Feb 2019

Keywords

  • Acidizing
  • Carbon storge
  • Dissolution
  • ECBM
  • microCT

ASJC Scopus subject areas

  • Fuel Technology
  • Geology
  • Economic Geology
  • Stratigraphy

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