Geo-electrical characterisation for Geological Carbon Sequestration [Presentation]

Transcription

1 Loughborough University Institutional Repository Geo-electrical characterisation for Geological Carbon Sequestration [Presentation] This item was submitted to Loughborough University's Institutional Repository by the/an author. Citation: RABIU, K.O. and DAS, D.B., 217. Geo-electrical characterisation for Geological Carbon Sequestration. Presented at the Early Career Researcher Winter School 217, University of Nottingham, UK, 13-16th February. Additional Information: This is a PowerPoint presentation. Metadata Record: Version: Accepted for publication Rights: This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4. International (CC BY-NC-ND 4.) licence. Full details of this licence are available at: Please cite the published version.

2 Geo-electrical Characterisation for Geological Carbon Sequestration KO Rabiu, DB Das Department of Chemical Engineering, Loughborough University, UK Winter School 217 Co organised by the EPSRC Centre for Doctoral Training in CCS and Cleaner Fossil Energy & the UK CCS Research Centre 13 th to 16 th February 217

3 Outline

4 Introduction Carbon dioxide has been considered to be a major contributor to the greenhouse gas which contributes to the global warming. Carbon capture and sequestration (CCS) technique has been suggested as a feasible option to mitigate this CO 2 emission. The major problem of CO 2 storage is the potential risk of CO 2 leakage from the storage reservoirs to shallow aquifer.

5 deep saline aquifers depleted oil and gas fields unmineable coal seams other options (e.g. basalts) Fig. 1: Methods for storing CO2 in deep underground geological formations Deep saline formations: Largest overall capacity, contain brackish water which are unfit for drinking Less previous data, Not well understood (sealing capacity) Depleted oil/gas fields: Well understood, economical (i.e. EOR possibility and CO 2 storage) Extensively drilled (leaks may occur), not sufficient volumetric capacity

6 Structural trapping Residual / capillary trapping Solubility trapping Mineral trapping

7 To find out the relationship between wet silica, carbonate and basalt sand formation s saturation with bulk electrical conductivity (σ b ) and bulk permittivity (ε b ) parameters. To investigate the effects of parameters (i.e. pressure, temperature, ph, rock type, salinity and salt type) on σ b -S w and ε b -S w relationships during CO 2 injection process.

8 Morphology structure of basalt, limestone and silicate porous media using SEM a b c Fig. 2: Scanning electron microscope (SEM) images of (a) Basalt (b) Limestone and (c) Silica sands

9 Fig. 3: High-pressure experimental set-up for the CO 2 -brine/water system Fig. 4: Photographs showing the sample holder with silica sand and TDR/pressure sensors

10 bulk dielectric permittivity, ε b (-) Carbonate sand: P=65bar, T=23C; Phase=Liquid CO2 Carbonate sand: P=65bar, T=23C; Phase=Liquid CO2 Carbonate sand: P=75bar, T=35C; Phase=ScCO2 Carbonate sand: P=75bar, T=35C; Phase=ScCO Water Saturation, Sw (-) bulk electrical conductivity, σ b (S/m) Carbonate sand: P=65bar, T=23C; Phase=Liquid CO2 Carbonate sand: P=65bar, T=23C; Phase=Liquid CO2 Carbonate sand: P=75bar, T=35C; Phase=ScCO2 Carbonate sand: P=75bar, T=35C; Phase=ScCO Water Saturation, Sw (-) Figure 6. Repeatability plot of ε b S relationships for liquid CO 2 / ScCO 2 water - carbonate sand system. Figure 5. Repeatability plot of σ b S relationships for liquid CO 2 / ScCO 2 water - carbonate sand system.

11 bulk dielectric constant, εb (-) P=65bar, T=25C, NaCl=.5%w/w, FR=5ml/min P=65bar, T=25C, MgCl2=.5%w/w, FR=5ml/min P=65bar, T=25C, distilled water, FR=5ml/min bulk electrical conductivity, σb (S/m) P=65bar, T=25C, NaCl=.5%w/w, FR=5ml/min P=65bar, T=25C, MgCl2=.5%w/w, FR=5ml/min P=65bar, T=25C, distilled water, FR=5ml/min Water saturation, Sw (-) Figure 7. Effect of salt types on ε b S relationships in liquid CO 2 water silica sand system Water saturation, Sw (-) Figure 8. Effect of salt types on σ b S relationships in liquid CO 2 water silica sand system.

12 Basalt: P=75bar, T=35C Basalt: P=75bar, T=23C Basalt: P=75bar, T=35C Basalt: P=75bar, T=23C bulk dielectric constant, (εb) Water Saturation, Sw (-) bulk electrical conductivity, (σb), (S/m) Water Saturation, Sw (-) Figure 9. Effect of temperature on ε b S relationships in CO 2 water basalt sand system. Figure 1. Effect of temperature on σ b S relationships in CO 2 water basalt sand system.

13 bulk dielectric constant, (εb) P=9bar, T=35C, NaCl=.5%w/w P=75bar, T=35C, NaCl=.5%w/w Water saturation, Sw (-) Figure 11. Effect of pressure on ε b -S relationships in scco 2 - water-silica sand system. bulk electrical conductivity, (σb), (S/m) P=9bar, T=35C, NaCl=.5%w/w P=75bar, T=35C, NaCl=.5%w/w Water saturation, Sw (-) Figure 12. Effect of pressure on σ b S relationships in scco 2 -water-silica sand system.

14 bulk dielectric constant, (εb) P=65bar, T=23C, NaCl=2%w/w P=65bar, T=23C, NaCl=.5%w/w P=65bar, T=23C, Distilled water bulk electrical conductivity, (σb) (S/m) P=65bar, T=23C, NaCl=2%w/w P=65bar, T=23C, NaCl=.5%w/w P=65bar, T=23C, Distilled water Water saturation, Sw (-) Water saturation, Sw (-) Figure 13. Effect of salinity on ε b -S relationships in liquid CO 2 -water-silica sand system. Figure 14. Effect of salinity on σ b S relationships in liquid CO 2 -water-silica sand system.

15 bulk dielectric permittivity, ε b (-) Basalt: P=75bar, T=35C, NaCl=.5%w/w, ph=6.5 Basalt: P=75bar, T=35C, NaCl=.5%w/w, ph=12 bulk electrical conductivity, σ b (S/m) Basalt: P=75bar, T=35C, NaCl=.5%w/w, ph=6.5 Basalt: P=75bar, T=35C, NaCl=.5%w/w, ph= Water saturation, Sw, (-) Water saturation, Sw, (-) Figure 15. Effect of ph on ε b S relationships for CO 2 water basalt sand system Figure 16. Effect of ph on σ b S relationships for CO 2 water basalt sand system

16 bulk dielectric permittivity, ε b (-) Limestone sand: P=75bar, T=35C, NaCl=.5%w/w Silica sand: P=75bar, T=35C, NaCl=.5%w/w Basalt: P=75bar, T=35C, NaCl=.5%w/w bulk electrical conductivity, σ b (S/m) Limestone sand: P=75bar, T=35C, NaCl=.5%w/w Basalt: P=75bar, T=35C, NaCl=.5%w/w Silica sand: P=75bar, T=35C, NaCl=.5%w/w Water saturation, Sw, (-) Water saturation, Sw, (-) Figure 17. Effect of porous media samples on εb S relationships in scco 2 water silica/limestone/basalt sand system. Figure 18. Effect of porous media samples on σ b S relationships in scco 2 water silica/limestone/ basalt sand system.

17 Geo-electrical parameters (σ b and ε b ) of the silica, limestone and basalt sand formation decreases with the injection of CO 2. The relationship between σ b (or ε b ) and brine saturation can be used for project monitoring purpose. Different injection depths affect the relationship between σ b (or ε b ) and brine saturation. Different porous media has effect on σ b -S w and ε b -Sw relationships

18 Thank you for listening Any question?