2D Model Study of CO2 Plumes in Saline Reservoirs by Borehole Resistivity Tomography
The performance of electrical resistivity tomography (ERT) in boreholes is studied numerically regarding changes induced by CO2 sequestration in deep saline reservoirs. The new optimization approach is applied to generate an optimized data set of only 4% of the comprehensive set but of almost simila...
Saved in:
| Main Author: | |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2011-01-01
|
| Series: | International Journal of Geophysics |
| Online Access: | http://dx.doi.org/10.1155/2011/805059 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832567032395071488 |
|---|---|
| author | Said A. al Hagrey |
| author_facet | Said A. al Hagrey |
| author_sort | Said A. al Hagrey |
| collection | DOAJ |
| description | The performance of electrical resistivity tomography (ERT) in boreholes is studied numerically regarding changes induced by CO2 sequestration in deep saline reservoirs. The new optimization approach is applied to generate an optimized data set of only 4% of the comprehensive set but of almost similar best possible resolution. Diverse electrode configurations (mainly tripotential α and β) are investigated with current flows and potential measurements in different directions. An extensive 2.5D modeling (>100,000 models) is conducted systematically as a function of multiparameters related to hydrogeology, CO2 plume, data acquisition and methodology. ERT techniques generally are capable to resolve storage targets (CO2 plume, saline host reservoir, and impermeable cap rock), however with the common smearing effects and artefacts. Reconstructed tomograms show that the optimized and multiply oriented configurations have a better-spatial resolution than the lateral arrays with splitting of potential and current electrode pairs between boreholes. The later arrays are also more susceptible to telluric noise but have a lower level of measurement errors. The resolution advance of optimized and multiply oriented configurations is confirmed by lower values for ROI (region of index) and residual (relative model difference). The technique acceptably resolves targets with an aspect ratio down to 0.5. |
| format | Article |
| id | doaj-art-4a4dcbb202f34e2db5ffe89a8859f807 |
| institution | Kabale University |
| issn | 1687-885X 1687-8868 |
| language | English |
| publishDate | 2011-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Geophysics |
| spelling | doaj-art-4a4dcbb202f34e2db5ffe89a8859f8072025-02-03T01:02:31ZengWileyInternational Journal of Geophysics1687-885X1687-88682011-01-01201110.1155/2011/8050598050592D Model Study of CO2 Plumes in Saline Reservoirs by Borehole Resistivity TomographySaid A. al Hagrey0Department of Geophysics, University of Kiel, Otto-Hahn-Platz 1, 24118 Kiel, GermanyThe performance of electrical resistivity tomography (ERT) in boreholes is studied numerically regarding changes induced by CO2 sequestration in deep saline reservoirs. The new optimization approach is applied to generate an optimized data set of only 4% of the comprehensive set but of almost similar best possible resolution. Diverse electrode configurations (mainly tripotential α and β) are investigated with current flows and potential measurements in different directions. An extensive 2.5D modeling (>100,000 models) is conducted systematically as a function of multiparameters related to hydrogeology, CO2 plume, data acquisition and methodology. ERT techniques generally are capable to resolve storage targets (CO2 plume, saline host reservoir, and impermeable cap rock), however with the common smearing effects and artefacts. Reconstructed tomograms show that the optimized and multiply oriented configurations have a better-spatial resolution than the lateral arrays with splitting of potential and current electrode pairs between boreholes. The later arrays are also more susceptible to telluric noise but have a lower level of measurement errors. The resolution advance of optimized and multiply oriented configurations is confirmed by lower values for ROI (region of index) and residual (relative model difference). The technique acceptably resolves targets with an aspect ratio down to 0.5.http://dx.doi.org/10.1155/2011/805059 |
| spellingShingle | Said A. al Hagrey 2D Model Study of CO2 Plumes in Saline Reservoirs by Borehole Resistivity Tomography International Journal of Geophysics |
| title | 2D Model Study of CO2 Plumes in Saline Reservoirs by Borehole Resistivity Tomography |
| title_full | 2D Model Study of CO2 Plumes in Saline Reservoirs by Borehole Resistivity Tomography |
| title_fullStr | 2D Model Study of CO2 Plumes in Saline Reservoirs by Borehole Resistivity Tomography |
| title_full_unstemmed | 2D Model Study of CO2 Plumes in Saline Reservoirs by Borehole Resistivity Tomography |
| title_short | 2D Model Study of CO2 Plumes in Saline Reservoirs by Borehole Resistivity Tomography |
| title_sort | 2d model study of co2 plumes in saline reservoirs by borehole resistivity tomography |
| url | http://dx.doi.org/10.1155/2011/805059 |
| work_keys_str_mv | AT saidaalhagrey 2dmodelstudyofco2plumesinsalinereservoirsbyboreholeresistivitytomography |