Technical Library

The Synthetic Aperture (SA) method is one of the key techniques in remote sensing using radio frequency signals. During recent years this method has also been applied to low frequency electromagnetic...

Full waveform inversion (FWI) with 𝐿𝐿2norm objective function often suffers from cycle skipping that causes the solution to be trapped in a local minimum, usually far from the true model. We...

We present a newly developed 3D inversion code for Towed streamer EM data utilizing the Gauss-Newton method. The code is designed and implemented on a standard cluster of nodes to handle large-scale...

Multi-parameter Full Waveform Inversion (FWI) suffers from leakage among different medium properties. Here we discuss a practical multi-parameter FWI solution that minimizes leakage and retrieves the...

Estimating a starting velocity model for Full Waveform Inversion can be challenging. It requires several passes of migration velocity analysis to obtain a model accurate enough to prevent cycle...

In this paper we introduce a large-scale 3D inversion technique for towed streamer electromagnetic (EM) data, which incorporates seismic constraints. The inversion algorithm is based on the integral...

We propose a new regularization scheme for Full Waveform Inversion (FWI). The new method makes use of a priori information on the spatial variability of the earthmodel to overcome the limitations of...

We describe a robust method to produce long-wavelength updates in gradient-based Full Waveform Inversion (FWI). The gradient is computed by applying dynamic weights in the velocity sensitivity kernel...