Here at Planet Equipoise we have been working very hard to provide IHSM with a massive new feature for the Kingdom Seismic Inversion module to be available with the Kingdom 2020 release.
It is Constrained Cascaded Pre-stack Inversion (PSI).
What is pre-stack inversion and why do we need it?
Pre-stack inversion is often used when post-stack inversion fails to sufficiently differentiate geologic features that have similar P-impedance signatures.
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.
So, prior to running PSI, SA Inversion is used to generate the P-wave impedance, S-wave and density reflectivity volumes with more elastic parameters generated to reduce the non-uniqueness in both lithological classification and detecting the presence and effect of fluids on that rock.
Pre-stack inversion is widely used in the industry because it has proven to be a highly effective approach in characterising both conventional and unconventional reservoirs.
What Are the Benefits of Kingdom Pre-Stack Seismic Inversion?
PSI is fast to analyse log data to determine whether elastic and petrophysical parameters can distinguish rock properties and hence determine whether pre-stack inversion is even worth trying. It leverages the existing simulated annealing inversion, a proven and robust post-stack inversion already in use by Kingdom users and provides elastic parameter transforms to Poisson’s ratio, Young’s modulus etc.
It can estimate porosity, VSH (Volume Shale Percentage), SW (Water Saturation) and TOC (Total Organic Carbon) using Extended Elastic Impedance (EEI) and log correlation. PSI maps reservoir properties using polygons relating elastic and petrophysical parameters
PSI is suitable for both conventional and unconventional reservoirs and it is simple to set up and easy to parametrize, and supports multi-CPU to maximise processing throughput
Contact us for a demo!