Detection of brine plumes in an oil reservoir using the geoelectric method
During water injection in a reservoir at the secondary recovery phase, oil is replaced by salt water, producing different saturation zones in the formation containing this reservoir. This process could be optimized if the direction of the fluids is monitored. Since there are large contrasts in the e...
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| Otros Autores: | , , |
| Formato: | Capítulo de libro |
| Lenguaje: | Inglés |
| Publicado: |
2013
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| Acceso en línea: | Registro en Scopus DOI Handle Registro en la Biblioteca Digital |
| Aporte de: | Registro referencial: Solicitar el recurso aquí |
| Sumario: | During water injection in a reservoir at the secondary recovery phase, oil is replaced by salt water, producing different saturation zones in the formation containing this reservoir. This process could be optimized if the direction of the fluids is monitored. Since there are large contrasts in the electric conductivity between salt water and oil, geoelectrical methods could provide a water saturation map at any given moment of the production. The case we study here corresponds to a rather shallow reservoir (between 500 and 600 m in depth). As the wells are in production, electrodes for borehole measurements cannot be introduced. Hence, our objectives are to determine the possibilities of detecting the channelling direction of saline water between injection and producing wells, and applying the method of placing electrodes on the surface or even burying them, but at depths corresponding to shallow layers. We design an electrical model of the reservoir and then numerically simulate the geoelectrical response in order to determine the conditions under which the anomaly, i.e. the accumulation of brine in a reduced area, can be detected. We find that the channelling of the brine can be detected for the reservoir studied here if the electrodes are placed at 180 m depth. The Wenner configuration using 16 electrodes provides the best resolution. Therefore, monitoring the voltage at a number of electrodes embedded at rather shallow depths (from a technical-logistic point of view) could give information about the direction of the saline channelling even if a quantitative image of the subsoil cannot be obtained due to the reduced number of electrodes used in the study. © 2013 Sinopec Geophysical Research Institute. |
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| Bibliografía: | Archie, G.E., The electrical resistivity log as an aid in determining some reservoir characteristics (1942) Pet. Trans. AIME, 146, pp. 54-62 Bermann, P., Schmidt-Hatternberger, C., Kiessling, D., Rücker, C., Labitzke, T., Henninges, J., Baumann, G., Schütt, H., Surface-downhole electrical resistivity tomography applied to monitoring of CO2 storage at Ketzin, Germany (2012) Geophysics, 77 (6), pp. 253-B267. , 10.1190/geo2011-0515.1 0016-8033 Donaldson, E.C., Chilingarian, G.V., Yen, T.F., (1989) Enhanced Oil Recovery, II - Processes and Operations, Developments in Petroleum Science, pp. 129-419 Edwards, L.S., A modified pseudosection for resistivity and induced polarization (1977) Geophysics, 42 (5), pp. 1020-1036. , 10.1190/1.1440762 0016-8033 Lake, L.W., (1992) Petroleum Engineering Handbook, pp. 621-627 Picotti, S., Gei, D., Carcione, J.M., Grünhut, V., Osella, A., Sensitivity analysis from single-well ERT simulations to image CO 2 migrations along wellbores (2013) Leading Edge, 32 (5), pp. 504-512. , 10.1190/tle32050504.1 1070-485X Reynolds, J., (1997) An Introduction to Applied and Environmental Geophysics, pp. 1-778 Serra, O., (1984) Fundamentals of Well-log Interpretation: 1. The Acquisition of Logging Data, p. 10 Telford, W.M., Geldart, L.P., Sheriff, R.E., (1990) Applied Geophysics, p. 648. , 10.1017/CBO9781139167932 |
| ISSN: | 17422132 |
| DOI: | 10.1088/1742-2132/10/4/045006 |