Kingdom 2021 will be out soon! We’ve been hard at work updating and enhancing both Kingdom VelPAK and the Kingdom Seismic Inversion software. Here we focus on more of What’s New in Kingdom Seismic Inversion!
Constrained Cascaded Pre-stack Inversion (PSI)
We continue to update the latest Kingdom Seismic Inversion – Pre-stack inversion. This leverages the Simulated Annealing Inversion technology for a multi-parameter approach to uniquely identifying rock and reservoir properties. The techniques are suitable for both conventional and unconventional targets. This will generate acoustic impedance, shear impedance and density volumes which can be correlated with logs and transformed into petrophysical properties for mapping and analysis. Typical properties are Poisson’s Ratio, Lambda-Rho, Mu-Rho, Young’s Modulus and Brittleness/Ductility. Inputs required are typically angle stacks, compressional and shear velocity logs from a well (or wells) tied with a high quality time-depth chart, and a velocity or impedance volume to constrain the inversion.
In an update to the LogSeisMatch module, the ability to extract a composite seismic trace along the borehole track has been added. This gives improved results in the Simulated Annealing inversion, both for post-stack and pre-stack equivalents, producing better estimated wavelets, and thus a better inversion result where wells are highly deviated.
The Simulated Annealing Inversions can now optionally output low-frequency acoustic impedance, shear impedance and density volumes as applicable, in addition to the inversion and synthetic results, if required. These volumes can be used as models in the next test run, saving time to re-parameterize jobs. They can also be used for cross-validation of inversion results in the new Inversion Validation tab.
Pre-stack inversion cross plot has been updated to fully enhance pairs of Elastic Parameters to be selected for display with each point represents one sample from the logs.
A third log can also be selected as the colour bar adding further detail to the plot. We can cross-plot the elastic logs from the commonest pre-set options, but you can also cross-plot the elastic logs against any logs in the project database, by using the “Other Logs” section and picking the two logs you wish to use.