Seismic Uncertainty Analysis - Characterization | Schlumberger

Quantitative Analysis of Seismic Uncertainty

Earth model uncertainty assessment

Improve your prospect feasibility assessments

The uncertainties inherent in earth and structural models can negatively impact all phases of well planning and reserves estimation. When used as part of the risk analysis and decision-making process, our analysis provides a quantitative assessment and improved insight into the feasibility of your prospect.

Quantify seismic uncertainty

Critical decisions about drilling hazards, well placement, and prospect appraisal are typically based on the interpretation of seismic images produced with an earth model. However, even when using modern workflows, evaluating the properties of the earth from seismic data is inherently non-unique. As a result, the uncertainty is poorly understood and lacks quantification. Our analysis enables you to quantify the seismic uncertainty in a mature earth model. It also enables upfront risk quantification by using statistics to determine the likelihood of a desired outcome.

 The seismic uncertainty workflow.

Key deliverables: P10/P50/P90 target horizons, gross rock volume (GRV) statistical distributions, spill point contours, and reliability maps.

Subsalt anticline SUA example
Subsalt anticline SUA example shows (a) 500 equiprobable spill points overlaid on the structure surface and (b) Input/P10/P90 horizons overlaid on the crest of the anticline showing 117 ft of variability.

Get deep insights into risks and structural variability

Quantitative analysis of seismic uncertainty generates perturbations in the Vp, delta, and epsilon fields around the tomographic solution, typically producing 500 equiprobable models that all satisfy the data. Deliverables from these models provide deeper insight into the risks and structural variability associated with a prospect.

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