Spatial variations in the absorption properties of the overburden cause frequency-dependent dissipation effects. This results in seismic amplitude attenuation and wavelet phase distortion which masks underlying events and decreases resolution.
CGG's proprietary Q tomography and Q PSDM help address these issues. Q tomography builds a model of the anomaly using pre-stack amplitudes. Q PSDM can then use this model to compensate, recovering bandwidth, allowing meaningful AVO studies to be performed and aiding in the accurate prediction of reservoir properties.
Frequency Shift Q Tomography (FS-QTOMO) is a refinement of the method. It's a purely data driven method using centroid frequency shift information from surface seismic data for back-propagation along ray paths to reconstruct the attenuation distribution in terms of Q (Quality Factor) values.
These sections from our Barreirinhas Basin multi-client survey, offshore Brazil, compare conventional PSDM overlain by our tomographic Q model (left) with results obtained with Q PSDM using that Q model (right).
Least-Squares Migration provides images with better balanced illumination, improved signal-to-noise ratio, reduced migration artifacts and more interpretable seismic amplitudes.
Reveal intricate velocity details for the clearest images. Harness seismic low frequencies from BroadSeis, StagSeis, seabed and land data.
Contact us by opening an online inquiry.
View CGG's extensive portfolio of products and solutions.