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Reservoir monitoring of the Magnus Field through 4D time-lapse seismic analysis

G. F. T. Watts, D. Jizba, D. E. Gawith and P. Gutteridge
Petroleum Geoscience, 2, 361-372, 1 November 1996, https://doi.org/10.1144/petgeo.2.4.361
G. F. T. Watts
BP Exploration, Poole, United Kingdom
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D. Jizba
BP Exploration, Poole, United Kingdom
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D. E. Gawith
BP Exploration, Poole, United Kingdom
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P. Gutteridge
BP Exploration, Poole, United Kingdom
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Abstract

During 10 years of production, crestal fluid pressures in the Magnus Field (UKCS) have dropped from 6650 psi to under 3500 psi leading to a two- to three-fold increase in the effective stress on the rock fabric. Petroacoustic measurements on cores indicate that this leads to a 12% increase in the acoustic impedance which, in theory, should be detectable using time-lapse seismic data. We analyse the difference between two 3D surveys shot over Magnus and relate this to dynamic changes in fluid pressure and saturation through time. The results demonstrate that, under certain conditions, fluid pressure changes may be detected in the reservoir and that fluid transmissibilities across faults can be deduced. Further, 4D seismic data may detect other dynamic processes, including thermal effects and cold water fracturing around injectors, and stress relaxation and fluid compositional changes around producers.

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In this issue

Petroleum Geoscience: 2 (4)
Petroleum Geoscience
Volume 2, Issue 4
November 1996
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Reservoir monitoring of the Magnus Field through 4D time-lapse seismic analysis

G. F. T. Watts, D. Jizba, D. E. Gawith and P. Gutteridge
Petroleum Geoscience, 2, 361-372, 1 November 1996, https://doi.org/10.1144/petgeo.2.4.361
G. F. T. Watts
BP Exploration, Poole, United Kingdom
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D. Jizba
BP Exploration, Poole, United Kingdom
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D. E. Gawith
BP Exploration, Poole, United Kingdom
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P. Gutteridge
BP Exploration, Poole, United Kingdom
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Reservoir monitoring of the Magnus Field through 4D time-lapse seismic analysis

G. F. T. Watts, D. Jizba, D. E. Gawith and P. Gutteridge
Petroleum Geoscience, 2, 361-372, 1 November 1996, https://doi.org/10.1144/petgeo.2.4.361
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