Gas Bubble Migration and Trapping in Porous Media: Pore-Scale Simulation

Nariman Mahabadi Mahabad, Xianglei Zheng, Tae Sup Yun, Leon van Paassen, Jaewon Jang

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Gas bubbles can be naturally generated or intentionally introduced in sediments. Gas bubble migration and trapping affect the rate of gas emission into the atmosphere or modify the sediment properties such as hydraulic and mechanical properties. In this study, the migration and trapping of gas bubbles are simulated using the pore-network model extracted from the 3D X-ray image of in situ sediment. Two types of bubble size distribution (mono-sized and distributed-sized cases) are used in the simulation. The spatial and statistical bubble size distribution, residual gas saturation, and hydraulic conductivity reduction due to the bubble trapping are investigated. The results show that the bubble size distribution becomes wider during the gas bubble migration due to bubble coalescence for both mono-sized and distributed-sized cases. And the trapped bubble fraction and the residual gas saturation increase as the bubble size increases. The hydraulic conductivity is reduced as a result of the gas bubble trapping. The reduction in hydraulic conductivity is apparently observed as bubble size and the number of nucleation points increase.

Original languageEnglish (US)
Pages (from-to)1060-1071
Number of pages12
JournalJournal of Geophysical Research: Solid Earth
Volume123
Issue number2
DOIs
StatePublished - Feb 1 2018

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Keywords

  • gas bubble
  • hydraulic conductivity
  • migration
  • nucleation
  • pore-network model
  • trapping

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

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