Time-Lapse 4D Analysis and Interpretation | SLB

Time-Lapse 4D Analysis and Interpretation

Accurate, repeatable, actionable information on reservoir changes over time

WesternGeco texture hero
WesternGeco texture hero

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.

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 Analysis- how the reservoir changes over time.
4D analysis and how the reservoir changes over time; reservoir production causes deformation in reservoir and surrounding rock.

History matching using time-lapse seismic data

Time-lapse seismic data contains a wealth of information about your reservoir’s pressure, saturation, and fluid contacts. Optimal interpretation of this data enables you to enhance

  • well placement
  • production and injection operations
  • production history matching
  • reservoir simulations.

Time-lapse saturation

Defining reservoir fluid-flow characteristics can improve flow models. Using time-lapse seismic methods, this technique allows your teams to observe the dynamic processes in and around the reservoir. As a result, you can place wells more effectively, increasing the success of the development and production stages.

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). These quantitative probability maps are more powerful inputs to models, meaning you can use them to reduce uncertainty in further developments.

Time-Lapse 4D Analysis and Interpretation Offerings