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Technical Content

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 ...

Technical Abstract
EAGE - European Association of Geoscientists and Engineers | Chris Davison, Gordon Poole © 2015 EAGE | June

A precise knowledge of the seismic source far-field signature is required for accurate source de-signature. Near-field hydrophone data can be used to provide good quality signatures but are not always available. We describe a method of extracting the far-field signature from inversion of direct ...

Technical Abstract
EAGE - European Association of Geoscientists and Engineers | Jim Gaiser © 2015 EAGE | June

Changes in fracture direction across interfaces can have an important impact on PS-wave reflection coefficients in azimuthally anisotropic media. Extending conventional joint inversion with P-waves to include amplitude variations with azimuth (AVAz) would use radial and transverse reflection coefficients (RPSV and RPSH, respectively), and ...

Technical Abstract
EAGE - European Association of Geoscientists and Engineers | Melanie Vu, Jing Yang, Xu Li, Dekang Xu, Hui Chen, J. Chen, B. Almoughraby © 2015 EAGE | June

We presented a joint tomography flow for OBN and streamer WAZ data in deep water Gulf of Mexico. This tomography provides the method to utilize surface offset gathers from surveys with different shot and receiver datums together for joint tomography. By incorporating both OBN ...

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