1887
Volume 46, Issue 3
  • ISSN: 0812-3985
  • E-ISSN: 1834-7533

Abstract

[

Carbon dioxide injection monitoring in offshore environments is a promising future application of the marine controlled-source electromagnetic (mCSEM) method. To investigate whether the mCSEM method can be used to quantitatively monitor variations in the distribution of the injected CO, we developed a mCSEM inversion scheme and conducted numerical analyses. Furthermore, to demonstrate the monitoring capability of the mCSEM method in challenging environments, we used a deep brine aquifer model in shallow sea as an injection target. The mCSEM responses of the injected CO in the deep brine aquifer were severely decayed and heavily masked by the air wave due to the proximity of the free space. Therefore, the accurate computation of small mCSEM responses due to the injected CO and the proper incorporation into the inversion process are critically important for the mCSEM method to be successful. Additionally, in monitoring situations, some useful information is usually available (e.g. well logs and seismic sections), and the proper implementation of this to our inversion framework is crucial to ensure reliable estimation of the distribution of the injected CO plume. In this study, we developed an efficient 2.5D mCSEM inversion algorithm based on an accurate forward modelling algorithm and the judicious incorporation of information into our inversion scheme. The inversion scheme was tested with simplified and realistic CO injection models and successfully recovered the resistivity distributions of the injected CO, although it still required the presence of a considerable amount of the injected CO. Based on these inversion experiments, we demonstrated that the mCSEM method is capable of quantitatively monitoring variations in the distribution of injected CO in offshore environments.

,

We developed an efficient 2.5D mCSEM inversion algorithm based on an accurate forward modelling algorithm and the judicious incorporation of information into our inversion scheme. We demonstrated the successful recovery of resistivity distributions of the injected CO from the deep brine aquifer model in the shallow sea.

]
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2015-09-01
2026-01-14

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/content/journals/10.1071/EG14096
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mCSEM inversion for CO2 sequestration monitoring at a deep brine aquifer in a shallow sea
Exploration Geophysics 46, 236 (2015); https://doi.org/10.1071/EG14096
/content/journals/10.1071/EG14096
/content/journals/10.1071/EG14096
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  • Article Type: Research Article
Keyword(s): a priori information; carbon dioxide; inversion; marine CSEM; monitoring

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