Spatially limited tomographic inversion for time-lapse oil reservoir monitoring

Toshiyuki Yokota; Akio Nishida; Shigeharu Mizohata; Sunao Muraoka

doi:10.1071/EG02018

ISSN: 0812-3985
E-ISSN: 1834-7533

Spatially limited tomographic inversion for time-lapse oil reservoir monitoring
Authors Toshiyuki Yokota^a, Akio Nishida^b, Shigeharu Mizohata^c and Sunao Muraoka^d
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^a Geological Survey of Japan / AIST, , Japan, Email: [email protected] ^b Japan National Oil Corp.,, Japan, Email: [email protected] ^c Japan National Oil Corp.,, Japan, Email: [email protected] ^d OYO Corp.,, Japan, Email: [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 33, Issue 1, Mar 2002, p. 18 - 22
DOI: https://doi.org/10.1071/EG02018
- Published online: 01 Mar 2002

Abstract

In this paper, we develop an improved technique for using seismic travel time tomography for time-lapse reservoir fluid monitoring. A model of a real reservoir is used to simulate the tomographic response to fluid injection for enhanced oil recovery (EOR).

In order to evaluate the applicability of seismic tomography to fluid-injection EOR monitoring, a numerical experiment was carried out. As ordinary tomography inversion failed to obtain good results, an inversion technique was developed under the assumption that ‘a velocity change occurs mainly in the reservoir’ during the EOR process.

A velocity estimation method for direct imaging of the injected fluid front was also developed. The results of this estimation improve the applicability of seismic tomography for monitoring of fluid-injection EOR.

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References

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Johnston, D. H., McKenny, R. S., Verbeek, J. and Almond, J., 1998, Time-lapse seismic analysis of Fulmar Field: Leading Edge, 17, 1420-1428.
Justice, J. H., Mathisen, M. E., Vassilou, A. A., Shiao, I., Alameddine, B. R. and Guinzy, N. J., 1993, Crosswell seismic tomography in improved oil recovery: First Break, 11, 229-239.
Lazaratos, S. K. and Marion, B. P., 1997, Crosswell seismic imaging of reservoir changes caused by CO2 injection: Leading Edge, 16, 1300-1306.
Mathisen, M. E., Cunningham, P., Shaw, J., Vassilou, A. A., Justice, J. H. and Guinzy, N. J., 1995, Crosswell seismic radial survey tomograms and the 3-D interpretation of a heavy oil steamflood: Geophysics, 60, 651-659.
Matsubara,Y. and Kurasawa,Y., 1992, Cross-well seismic tomography for monitoring EOR process: A case study at the South Casper Creek oil field: Geotomography volume 2 proceedings of the second SEGJ/SEG international symposium on geotomography, 149-157.
Talley, D. J., Davis, T. L., Benson, R. D. and Roche, S. L., 1998, Dynamic reservoir characterization of Vacuum Field: Leading Edge, 17, 1396-1402.
Vidale, J., 1988, Finite-difference calculation of travel times, Bull. Seism. Soc. Am., 78, 2062-2076.

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Article Type: Research Article

Keyword(s): EOR monitoring; seismic travel time tomography

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Spatially limited tomographic inversion for time-lapse oil reservoir monitoring

Abstract

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