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Pre-stack Inversion

Note the Pre-Stack Inversion is only available as part of the Kingdom Seismic Inversion module and is not available on Schlumberger’s Petrel InSeis.

Pre-stack inversion can be used when post-stack inversion fails to sufficiently differentiate geologic features that have similar P-impedance signatures. It makes use of amplitude versus offset information and inverts offset gathers for P-impedance, S-impedance and density.

Kingdom PSI does not work on seismic gathers. Instead it works primarily with Angle Stacks and existing technology available to the user through existing post-stack SA tools (SA Inversion) to run for acoustic, shear impedances and density. The results are equivalent to those of simultaneous 3-parameter pre-stack inversion.

Click here to watch a webinar of the Pre-Stack Inversion [when it is available for public consumption].

More elastic parameters can be derived from Vp, Vs and density. These include Acoustic Impedance, Shear Impedance, Poisson’s ratio, Vp/Vs, Poisson’s Ratio, Lambda*Rho, Mu*Rho, Lambda/Mu, Young’s Modulus and Elastic Impedance (EEI).

Kingdom PSI then displays all the elastic logs and cross-plots any pair of elastic logs in either linear or logarithmic scales.

Pre-Stack Seismic Inversion takes the following seismic data:

  • P and S wave reflectivity stacks (Rp and Rs) from Fatti’s 2-term AVO analysis
  • The Intercept and gradient stacks from Shuey’s AVO analysis. These two stacks are then converted to Rp and Rs stacks
  • Minimum 3 angle stacks, which are then converted to Rp and Rs or density stacks

Benefits of Kingdom Pre-stack Inversion:

  • Elastic log analysis to identify targets
  • Cross-plot any pairs of logs
  • EEI and log correlation analysis
  • AVO analysis on multiple angle stacks
  • Cascaded and constrained inversion for AI, SI and density
  • Wavelet estimation for P, S and density reflectivity volumes
  • Elastic parameter transform to Poisson’s ratio, Young’s modulus etc.
  • Mapping reservoir properties using polygons
  • Estimate porosity, VSH, SW and TOC using EEI and log correlation
  • Suitable for both conventional and unconventional reservoirs
  • Simple to set up & easy to parametrize, and supports multi-CPUs
  • Fully integrated with Kingdom project database as there is no data transfer time