dGB Earth Sciences

Bayesian Linear Inversion

LTrace Bayesian Linear Inversion provides a deterministic seismic inversion based on the linearized Bayesian methodology for estimating elastic properties from seismic data. This plugin provides both acoustic and elastic inversion. The input data are seismic data, wavelet and low-frequency model of the properties. The results are comparable to a constrained sparse spike inversion but are obtained 6x to 10x faster, since no optimization is required and the solution is analytically computed. The software also implements an approximation on the horizontal continuity model along an input horizon, allowing the user to impose lateral correlation on the results with a low overhead.

"LTrace provides a field-proven and cost-effective solution for seismic elastic inversion."
--Dr. Daniel Maia, Reservoir Geophysicist, Karoon Gas

All commercial plugins require OpendTect Pro.

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Acoustic inversion

Absolute Acoustic Impedance remains a cornerstone of modern seismic interpretation projects. It enables interpreting layer properties without distortions caused by tuning effects. LTrace Acoustic Bayesian Linear Inversion provides a deterministic acoustic seismic inversion using the linearized Bayesian methodology for estimating acoustic impedance from seismic data. The input data are the full stack seismic data, the wavelet and the low frequency model of acoustic inversion.

Elastic inversion

LTrace Bayesian Linear Inversion provides a deterministic elastic seismic inversion using the linearized Bayesian methodology for estimating velocities or impedances and density. We use angle stacked seismic data - such as near, mid and far - along with low frequency models to quickly perform the inversion. For the elastic inversion, the software uses the latest Graphics Processing Unit (GPU) technologies to accelerate the inversion processing. If the user has an NVIDIA® GPU, the inversion will be automatically processed using it. Using GPUs provides a performance gain over CPUs of 4 to 7 times in our benchmarks, depending on the model of the GPU and the vertical gate selected at the inversion.

Features

A suggested workflow is to perform quality control (QC) comparing the inversion results with well log data. The QC implementation enables the user to change the parameters and quickly run the inversion on a limited area, automatically updating the QC window with the new results. After defining the optimal parameters, the user can perform the inversion on the full volume.

F3 Demo + Bayesian Inversion

LTrace team prepared a sample dataset of F3 Block for the users to quickly run our Bayesian inversion. Derived from the original data provided by dGB Earth Sciences, it includes angle stacks, wavelets, background models and a sample parameters file. Click here to download the dataset.

All commercial plugins require OpendTect Pro.

More Information

Technical Report
OpendTect Technology Webinar: Bayesian Seismic Inversion and Statistical Multi-trace Wavelet Estimation