Inversion toolkit
Inversion toolkit
Seismic inversion transforms reflectivity data into 3D property volumes that are used to evaluate reservoir distribution and estimate porosity, fluid fill, net-to-gross, and other key parameters. Sharp Reflections takes a gathers-first approach to inversion, integrating data conditioning, interpretation and inversion into one seamless workflow. Users can evaluate multiple inversion constraints quickly and efficiently to acquire geologically meaningful results and manage predrill risk.
Fine-tune your seismic data conditioning, interpretation and explore inversion constraints—acquire the most geologically meaningful results and manage risk
Sharp Reflections INV toolkit features two modern geostatistical inversion technologies—CRAVA* and PCube+*. The two methodologies work differently and can be used separately or together. Users can carry out inversions with both methods and select the results that best reduce key reservoir uncertainties.
*CRAVA and PCube+ are developed by Norwegian Computing Center (NCC) and commercialized by Sharp Reflections. Together we are continuing to develop both technologies.
Key capabilities
CRAVA model-based geostatistical prestack Bayesian amplitude versus offset (AVO) inversion
PCUBE+ one-step prestack inversion directly to lithofacies and fluid classes (LFC) probabilities
CRAVA Model-based geostatistical inversion for elastic properties
CRAVA is a model-based geostatistical prestack Bayesian amplitude versus offset (AVO) inversion method taking uncertainty in seismic amplitude data into account. It incorporates a low-frequency prior model resulting in elastic property cubes expressed in absolute values that, ideally, match the actual elastic properties measured in wells.
CRAVA results provide good quality full bandwidth estimates of elastic properties that may be used in subsequent reservoir interpretation and analysis.
PCube+ Direct, one-step prestack inversion to predict lithology fluid class probabilities
PCube+ is a modern, one-step probabilistic prestack inversion that predicts probabilities of lithology fluid classes (LFC) and their associated elastic properties. The technology performs integrated inversion of a facies-based prior model and the given seismic amplitudes to estimate the most likely lithology fluid rock types. The results may be used to derive tightly defined estimates of reservoir properties (e.g. porosity and net-to-gross).
PCube+ can incorporate geological constraints in the inversion. For example, a brine sand is never expected immediately above a gas sand, and this situation can be prevented in the prior model. Such constraints help to ensure geological plausibility while extracting information from the seismic data.
Key technical capabilities
CRAVA
Model-based geostatistical prestack Bayesian AVO inversion
Built-in model builder to create low frequency prior model from horizons and wells
Uses partial angle stacks to exploit amplitude versus offset amplitude variation with angle (AVA) information
Robust well tie and wavelet estimation
PCube+
One-step prestack inversion directly to LFC probabilities
Fast and robust results using geological knowledge to constrain inversion results
Proper handling of uncertainty in rock physics relationships
No separate classification step
Uses partial angle stacks to exploit AVA information
Built-in parameterization QCs: LFC probability, wavelet scaling, signal/noise (S/N) ratio, etc.
Statistical analysis of logs to create discrete lithology and fluid classes
LFC depth/time trends can incorporate compaction trends
Anisotropic (VTI) LFCs for accurate forward modeling
To learn from our experts how to do all this in a real project, sign up for this course:
Dive into the details
Sharp Reflections software equips users to explore complex, multidimensional data volumes interactively using five toolkits. Users move smoothly across the entire spectrum of workflows, from data processing and conditioning through to 4D time-lapse interpretation, all on one platform.
Prestack Data Enhancement
Optimize the reliability of your seismic data.
Quantitative Amplitude Interpretation
Sharpen reservoir insight with multistep QAI analysis. Dive deeper
Inversion
Improve reservoir delineation and net-pay estimation.
Azimuthal
Improve illumination and understanding of complex geological structures.
4D Time-Lapse
Identify poorly drained or bypassed reservoir sections.
All the data for the best decisions
Sharp Reflections is the industry’s only software platform built on a powerful compute and display engine designed specifically for HPC, for use on your premises or in the cloud.
Our integrated platform enables you to start analyzing and interpreting seismic data as soon as processing begins. No information is wasted as you reduce uncertainty and fine tune your reservoir characterization to help achieve trustable exploration, drilling and production decisions.