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Plug-in Attributes
Norway, EAR99
  • 2019 | 2020 | 2021
Supporting Documents
Installation Guide
Release Notes
Blueback ODiSI is a robust joint and simultaneous stochastic inversion method that produces high-quality images of reservoir properties, such as porosity, N/G, HPV and its associated uncertainties. It works using prior distribution models based on a rock physics model and a geologically realistic model that provide close control of the lithofacies proportions
  • No low frequency model required
  • No lateral/spatial constraints applied
  • Jointly inverts to both facies and rock properties (Porosity, NtG) at the same time
  • Simultaneously inverts multiple color inverted angle stacks
  • Provides probable values and uncertainty (mean and stdv) and high/low percentile realizations
  • Works by generating 1000s of statistically correct (i.e. follows real-well facies distributions and rock properties) pseudo-wells, generates a synthetic to each and matches to the seismic data
  • The best matching pseudo-wells are then selected to provide mean lithofacies and rock property values and their uncertainties
Produces high-quality images of reservoir properties and uncertainties. Process is strictly based on geological concepts. Modeling is done using Markov Chains for vertical statistics then by a RPM to assign petrophysical and elastic parameters. Salient QC guides the user through every step of the process. The inversion executes as a multi-threaded task within Petrel, on a cluster or in cloud.
Additional Information
Jointly developed with BP. For more detailed information, please kindly refer to "Stochastic Inversion by matching to large number of pseudo wells" (Geophysics Vol 81-2016) by Patrick Connolly and Mathew J. Hughes. Cegal also offer a consultancy service for performing ODiSI inversion studies.