CGGVeritas’ Global 4D Inversion enables more accurate and quantitative interpretation of production effects using 4D seismic data. It incorporates rock physics constraints in the simultaneous inversion of all available 4D vintages to reduce uncertainty and produce results which are more consistent with the observed production history of the field.

Global 4D Inversion can be cascaded with 4D Bayesian fluid classification to provide intuitive interpretation of the time-lapse evolution of fluid distribution and assess uncertainty in predicting fluid movements.

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1992 Fluid Distribution	2003 Fluid Distribution
After 4D Global Inversion, 4D Bayesian fluid classification is applied to map the time evolution of hydrocarbon sand probability. In this North Sea reservoir the effects of oil production and water flooding are clearly seen in the map distribution of oil sand probability, allowing undrained hydrocarbon sands to be easily identified in the 2003 data. The images show the time evolution of oil sand probability for a reservoir layer close to the original 1992 oil-water contact.

FEATURES

• Simultaneous inversion of all 4D vintages
• Flexible user-defined 4D constraints
• Simulated Annealing approach for global best fit
• Stratigraphic framework incorporates 4D time-shifts
• Cascaded 4D Bayesian fluid classification

• Quantitative estimates of 4D changes in reservoir properties
• Constrained results consistent with expected production effects
• Intuitive interpretation of 4D fluid movements
• Assessment of uncertainty in fluid distribution