Creating The Premier Energy Data Company

PGS and TGS have merged to form a pioneering data and services company in the energy sector, serving customers across the energy value chain and positioning itself as a strategic partner for energy companies. Explore our vision. 

PGS Ultima

A simultaneous inversion that delivers a superior velocity model, the highest quality reflectivity image, and an accurate density model.

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  • Velocity model is optimized by simultaneous iterative updates to reflectivity model 
  • Reflectivity model is optimized by simultaneous iterative updates to velocity model 
  • Can accelerate the delivery of accurate velocity and seismic reflectivity products 
  • It is possible to bypass many time-consuming pre-migration processing steps 
  • Reliable acoustic and elastic rock property derivation 
  • Suitable for streamer and OBN datasets 
  • Outputs: velocity model, reflectivity model, density model and angle gathers

Ultima is equivalent to performing FWI (Full Waveform Inversion) and LSM (Least-Squares Migration) in a single framework. It delivers an accurate velocity model and reflectivity model in an accelerated timeframe.

A novel implementation of the acoustic wave equation removes any assumption of a prior density model. This equation is used for both forward modeling in the FWI component and for reflectivity updates in the LSM component.

PGS Ultima is applicable to data from all marine seismic acquisition platforms. Inputs are an initial velocity model and preconditioned shot gathers.

Key reservoir properties, including density variation, the ratio of P and S velocities, and impedance, can be derived from PGS Ultima and its corresponding outputs. The estimation of the density property represents a novel approach, owing to the distinctive formulation employed in both the modeling and inversion processes.
With faster access to key products, asset teams have more time to analyze the data to understand and reduce risk in field exploration, development, or production. 

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If you have a question related to our Imaging & Characterization services or would like to request a quotation, please get in touch.