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Technical Content

Technical Abstract
EAGE - European Association of Geoscientists and Engineers | James Cooper, Gordon Poole, Richard Wombell, Ping Wang © 2015 EAGE | June

In shallow water environments, water-layer related multiples (WLRMs) typically dominate other classes of multiple, and achieving effective attenuation of WLRMs is of significant interest. When combined with an appropriate adaptive subtraction, Model-based Water-layer Demultiple (MWD) has been found to be highly effective in attenuating ...

Technical Abstract
EAGE - European Association of Geoscientists and Engineers | Raphael Sternfels, Ghislain Viguier, Regis Gondoin, David Le Meur © 2015 EAGE | June

Several methods have been proposed to improve the signal-to-noise ratio by attenuating incoherent noise, including prediction error filtering (Canales 1984), projection filtering (Soubaras 1995), and more recently rank reduction filtering. In this last category, we can differentiate eigenimage filtering (Trickett 2003), Cadzow / Singular ...

Technical Abstract
EAGE - European Association of Geoscientists and Engineers | Qingqing Sun, Ramiro Moro, Weiping Gou, Nicolas Chazalnoel © 2015 EAGE | June

One way to address the problem of weak subsalt illumination is through angle gather illumination weighting (AGILW). In this technique, synthetic data mimicking the field data are generated and migrated the same way as the field data. Illumination weighting scalars are obtained by measuring ...

Technical Abstract
EAGE - European Association of Geoscientists and Engineers | Thomas Elboth, Fakhreddine Haouam © 2015 EAGE | June

The test showed that, in the central North Sea, with appropriate denoising, we were able to successfully remove SI from all azimuths down to a vessel separation of less than 25 km. By adjusting vessel speeds to make sure that SI did not arrive ...

Technical Abstract
EAGE - European Association of Geoscientists and Engineers | Chao Peng, Weiping Gou, Guoxing Liu © 2015 EAGE | June

We present an input data selection workflow based on 3D ray-tracing to improve the RTM image in areas of poor illumination and low signal-to-noise ratio. It is effective for imaging subsalt three-way closure with weak subsalt primaries and strong noise levels. The workflow can ...

Technical Abstract
EAGE - European Association of Geoscientists and Engineers | Francesco Perrone, Patrice Guillaume, Tim Seher © 2015 EAGE | June

Serial processing of PP and PS waves leads to depth inconsistencies between the PP and PS migrated images. The link between P- and S-velocity model is the Vp/Vs ratio, whose estimation is an important task in multicomponent analysis because of its applications to lithology ...

Technical Abstract
EAGE - European Association of Geoscientists and Engineers | Ross Haacke, Gary Hampson, Barbara Golebiowski © 2015 EAGE | June

Discusses use of simultaneous-source acquisition for sparse (ROV-deployed) OBN surveys, using time and motion studies to quantify impact on acquisition time. Also describes new technique for sim-src crosstalk noise attenuation using modified Radon operators. Finally, application to Gorgon OBN data for baseline and monitor ...

Technical Abstract
EAGE - European Association of Geoscientists and Engineers | Ross Haacke, Ivan Lim, Kevin Davies © 2015 EAGE | June

Multiple timelapse realisations produced using wavefield separation, data selection, or diverging processing flows are combined using powerful noise-reducing data weights formulated using the 3D images as well as the 4D differences. The result separates 4D signal from incoherent 4D noise and also 4D noise ...

Technical Abstract
EAGE - European Association of Geoscientists and Engineers | Jeremie Messud, Gilles Lambare, Patrice Guillaume, Christophe Rohel © 2015 EAGE | June

In the context of WAZ data the VTI hypothesis is not always sufficient for insuring focusing of time migration. We propose an extension of non-linear slope tomography for time imaging to the orthorhombic case. We use a model of orthorhombic anisotropy parameterized by five ...