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Technical Content

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 ...

Technical Abstract
EAGE - European Association of Geoscientists and Engineers | Adel Khalil, Henning Hoeber, Bernard Deschizeaux, Steve Campbell © 2015 EAGE | June

The seismic image represents the spatially variable reflectivity of the medium where migration effectively rotates the wavelet to be normal to the imaged reflectors. While this is the general case, it is often disregarded, and one-dimensional spectral analysis of the vertical coordinate is commonly ...

Technical Abstract
EAGE - European Association of Geoscientists and Engineers | Xin Hu, Jenny Qin, Jingbo Liu, Jeshurun Hembd © 2015 EAGE | June

Estimation of primaries by sparse inversion (EPSI) is an iterative method that effectively separates primaries and surface-related multiples, especially in shallow water. Multiple attenuation in shallow water is challenging, mainly because of acquisition limitations. We propose a strategy for EPSI with the following objectives ...

Technical Abstract
EAGE - European Association of Geoscientists and Engineers | Liuling Gong, Adam Searle, Chu-Ong Ting, J. Hefti, E. Neumann, J. P. Taylor, M.R. Sarif © 2015 EAGE | June

The Point Thomson field, located on the North Slope of Alaska, covers the transition zone from onshore to a frozen lagoon. This complexity in the near-surface poses many challenges to proper imaging of the reservoir. Unground ice on the lagoon causes very poor signal-to-noise ...

Technical Abstract
EAGE - European Association of Geoscientists and Engineers | Lorenzo Casasanta, Zhiguang Xue, Sam Gray © 2015 EAGE | June

Although wavefield extrapolation techniques are well developed for P-wave seismic imaging, ray based migration algorithms are still the workhorse for converted-wave (PS-wave) depth imaging. Full (exact) elastic-wave reverse-time anisotropic migration (RTM) has not been widely adopted for reasons of computational and workflow efficiency, despite ...

Technical Abstract
EAGE - European Association of Geoscientists and Engineers | Henning Hoeber, Adel Khalil, Mark Schons, Shaji Mathew, Steve Campbell, Ellia Gubbala © 2015 EAGE | June

4D seismic processing is designed to minimize non-repeatable noise while preserving real 4D signal. Coherent noise, such as from surface and interbed multiples, has different character from one vintage to another. Mitigating for these unwanted effects in a vintage-independent manner leads to suboptimal 4D ...