Schlumberger

Time-Lapse 4D Analysis and Interpretation

The ability to accurately monitor fluid movements in the reservoir is driven by improvements in seismic signal fidelity and repeatability from the application of point-receiver technology such as the UniQ and Q-Marine systems, together with Well-Driven Seismic data integration.

With an understanding of the fluid production, injection, and geometry in geomechanically active reservoirs such as compaction drive reservoirs, we can detect traveltime changes not just in the reservoir, but also in the overburden. In these reservoirs, production causes subsurface deformations and changes in seismic velocity. These changes in the overburden can be monitored and interpreted using time-lapse seismic data.

4D Simultaneous Inversion

History matching using time-lapse seismic data

Interpretations of reservoir pressure, saturation, and fluid contacts from time-lapse seismic data contribute to production enhancement by optimizing well placement and by improving production and injection operations. In addition, time-lapse seismic data and their interpretations may also be used to constrain production history matching and enhance reservoir simulations.

Time-lapse saturation

Time-lapse seismic data may be used to define the fluid-flow characteristics of the reservoir and improve flow models. The technique uses time-lapse seismic methods, and allows asset teams to observe the dynamic processes in and around the reservoir, making the development and production stages more successful by placing wells more effectively.

Stochastic simulation

Probability maps are generated using stochastic simulation because the different classifications overlap. The maps depict the probability of an area being drained, partially drained, or undrained according to various oil-saturation changes (ΔSo). The maps reduce the uncertainty in further development because they are quantitative and are a more powerful input to models.

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4D Analysis: How the Reservoir Changes Over Time

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