Tracing the movement of CO2 injected into a mature oilfield using carbon isotope abundance ratios: the example of the Pembina Cardium CO2 monitoring project

Gareth Johnson, Bernhard Mayer, Maurice Shevalier, Michael Nightingale, Ian Hutcheon

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

During CO2 storage operations in mature oilfields or saline aquifers it is desirable to trace the movement of injected CO2 for verification and safety purposes. We demonstrate the successful use of carbon isotope abundance ratios for tracing the movement of CO2 injected at the Cardium CO2 Storage Monitoring project in Alberta between 2005 and 2007. Injected CO2 had a δ13C value of −4.6 ± 1.1‰ that was more than 10‰ higher than the carbon isotope ratios of casing gas CO2 prior to CO2 injection with average δ13C values ranging from −15.9 to −23.5‰. After commencement of CO2 injection, δ13C values of casing gas CO2 increased in all observation wells towards those of the injected CO2 consistent with a two-source endmember mixing model. At four wells located in a NE-SW trend with respect to the injection wells, breakthrough of injected CO2 was registered chemically (>50 mol% CO2) and isotopically 1–6 months after commencement of CO2 injection resulting in cumulative CO2 fluxes exceeding 100,000 m3 during the observation period. At four other wells, casing gas CO2 contents remained below 5 mol% resulting in low cumulative CO2 fluxes (<2000 m3) throughout the entire observation period, but carbon isotope ratios indicated contributions between <30 and 80% of injected CO2. Therefore, we conclude that monitoring the movement of CO2 in the injection reservoir with geochemical and isotopic techniques is an effective approach to determine plume expansion and to identify potential preferential flowpaths provided that the isotopic composition of injected CO2 is constant and distinct from that of baseline CO2.
LanguageEnglish
Pages933-941
Number of pages9
JournalInternational Journal of Greenhouse Gas Control
Volume5
Issue number4
DOIs
Publication statusPublished - 15 Mar 2011

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Isotopes
carbon isotope
carbon isotope ratio
well
Carbon
Monitoring
monitoring
Gases
Fluxes
gas well
Aquifers
gas
isotopic composition
plume
aquifer
safety
Chemical analysis
project
trend

Keywords

  • stable isotopes
  • CO2 storage
  • carbon isotopes
  • enhanced oil recovery
  • Cardium formation
  • Pembina
  • Alberta

Cite this

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abstract = "During CO2 storage operations in mature oilfields or saline aquifers it is desirable to trace the movement of injected CO2 for verification and safety purposes. We demonstrate the successful use of carbon isotope abundance ratios for tracing the movement of CO2 injected at the Cardium CO2 Storage Monitoring project in Alberta between 2005 and 2007. Injected CO2 had a δ13C value of −4.6 ± 1.1‰ that was more than 10‰ higher than the carbon isotope ratios of casing gas CO2 prior to CO2 injection with average δ13C values ranging from −15.9 to −23.5‰. After commencement of CO2 injection, δ13C values of casing gas CO2 increased in all observation wells towards those of the injected CO2 consistent with a two-source endmember mixing model. At four wells located in a NE-SW trend with respect to the injection wells, breakthrough of injected CO2 was registered chemically (>50 mol{\%} CO2) and isotopically 1–6 months after commencement of CO2 injection resulting in cumulative CO2 fluxes exceeding 100,000 m3 during the observation period. At four other wells, casing gas CO2 contents remained below 5 mol{\%} resulting in low cumulative CO2 fluxes (<2000 m3) throughout the entire observation period, but carbon isotope ratios indicated contributions between <30 and 80{\%} of injected CO2. Therefore, we conclude that monitoring the movement of CO2 in the injection reservoir with geochemical and isotopic techniques is an effective approach to determine plume expansion and to identify potential preferential flowpaths provided that the isotopic composition of injected CO2 is constant and distinct from that of baseline CO2.",
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Tracing the movement of CO2 injected into a mature oilfield using carbon isotope abundance ratios : the example of the Pembina Cardium CO2 monitoring project. / Johnson, Gareth; Mayer, Bernhard; Shevalier, Maurice; Nightingale, Michael; Hutcheon, Ian.

In: International Journal of Greenhouse Gas Control , Vol. 5, No. 4, 15.03.2011, p. 933-941.

Research output: Contribution to journalArticle

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T1 - Tracing the movement of CO2 injected into a mature oilfield using carbon isotope abundance ratios

T2 - International Journal of Greenhouse Gas Control

AU - Johnson, Gareth

AU - Mayer, Bernhard

AU - Shevalier, Maurice

AU - Nightingale, Michael

AU - Hutcheon, Ian

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N2 - During CO2 storage operations in mature oilfields or saline aquifers it is desirable to trace the movement of injected CO2 for verification and safety purposes. We demonstrate the successful use of carbon isotope abundance ratios for tracing the movement of CO2 injected at the Cardium CO2 Storage Monitoring project in Alberta between 2005 and 2007. Injected CO2 had a δ13C value of −4.6 ± 1.1‰ that was more than 10‰ higher than the carbon isotope ratios of casing gas CO2 prior to CO2 injection with average δ13C values ranging from −15.9 to −23.5‰. After commencement of CO2 injection, δ13C values of casing gas CO2 increased in all observation wells towards those of the injected CO2 consistent with a two-source endmember mixing model. At four wells located in a NE-SW trend with respect to the injection wells, breakthrough of injected CO2 was registered chemically (>50 mol% CO2) and isotopically 1–6 months after commencement of CO2 injection resulting in cumulative CO2 fluxes exceeding 100,000 m3 during the observation period. At four other wells, casing gas CO2 contents remained below 5 mol% resulting in low cumulative CO2 fluxes (<2000 m3) throughout the entire observation period, but carbon isotope ratios indicated contributions between <30 and 80% of injected CO2. Therefore, we conclude that monitoring the movement of CO2 in the injection reservoir with geochemical and isotopic techniques is an effective approach to determine plume expansion and to identify potential preferential flowpaths provided that the isotopic composition of injected CO2 is constant and distinct from that of baseline CO2.

AB - During CO2 storage operations in mature oilfields or saline aquifers it is desirable to trace the movement of injected CO2 for verification and safety purposes. We demonstrate the successful use of carbon isotope abundance ratios for tracing the movement of CO2 injected at the Cardium CO2 Storage Monitoring project in Alberta between 2005 and 2007. Injected CO2 had a δ13C value of −4.6 ± 1.1‰ that was more than 10‰ higher than the carbon isotope ratios of casing gas CO2 prior to CO2 injection with average δ13C values ranging from −15.9 to −23.5‰. After commencement of CO2 injection, δ13C values of casing gas CO2 increased in all observation wells towards those of the injected CO2 consistent with a two-source endmember mixing model. At four wells located in a NE-SW trend with respect to the injection wells, breakthrough of injected CO2 was registered chemically (>50 mol% CO2) and isotopically 1–6 months after commencement of CO2 injection resulting in cumulative CO2 fluxes exceeding 100,000 m3 during the observation period. At four other wells, casing gas CO2 contents remained below 5 mol% resulting in low cumulative CO2 fluxes (<2000 m3) throughout the entire observation period, but carbon isotope ratios indicated contributions between <30 and 80% of injected CO2. Therefore, we conclude that monitoring the movement of CO2 in the injection reservoir with geochemical and isotopic techniques is an effective approach to determine plume expansion and to identify potential preferential flowpaths provided that the isotopic composition of injected CO2 is constant and distinct from that of baseline CO2.

KW - stable isotopes

KW - CO2 storage

KW - carbon isotopes

KW - enhanced oil recovery

KW - Cardium formation

KW - Pembina

KW - Alberta

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SP - 933

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JO - International Journal of Greenhouse Gas Control

JF - International Journal of Greenhouse Gas Control

SN - 1750-5836

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ER -