CO 2 sequestration by mineral trapping in natural analogues in the Yinggehai Basin, South China Sea

Rui Liu, Niklas Heinemann, Jianzhang Liu, Weilin Zhu, Mark Wilkinson, Yuhong Xie, Zhenfeng Wang, Tao Wen, Fang Hao, R. Stuart Haszeldine

Research output: Contribution to journalArticlepeer-review

Abstract

Mineral trapping of CO 2 by precipitation of carbonate minerals is seen as the most permanent and secure mechanism of CO 2 storage. We have investigated mineral trapping in CO 2 -rich siliciclastic reservoirs of the Upper Miocene age in the Yinggehai Basin (South China Sea) and used nearby CO 2 -poor reservoirs of similar age as benchmarks for the analysis. Within the reservoir, the CO 2 has triggered the reaction from calcite plus chlorite to ankerite plus kaolinite, which traps 5 mol of CO 2 per mole of chlorite. Geochemical modelling shows that the total amount of permanently trapped CO 2 is approximately one half of the CO 2 in the newly formed ankerite. Caprock mineralogy shows that CO 2 leakage has occurred and CO 2 has migrated into the shale-rich caprock, but without loss of caprock integrity.

Original languageEnglish (US)
Pages (from-to)190-199
Number of pages10
JournalMarine and Petroleum Geology
Volume104
DOIs
StatePublished - Jun 2019
Externally publishedYes

Keywords

  • CO geological storage
  • Mineral trapping
  • Reservoir overpressure
  • Yinggehai basin

ASJC Scopus subject areas

  • Oceanography
  • Geophysics
  • Geology
  • Economic Geology
  • Stratigraphy

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