eGWM Depth Migration
Wave equation migration (WEM) tackles the issues encountered by ray-based methods like Kirchhoff, which struggle to image structures beneath complex overburden. However, this advancement leads to increased run-time, costs, and energy consumption. Future migration methods must combine the advantages of WEM with improved efficiency.
Legacy wave equation migrations (WEM) suffers from dip limitations and multi-mode contamination from trying to model all wave modes. Reverse Time Migration (RTM), a widely used WEM technique, presents its own challenges as an acoustic method: it produces low-frequency images, fails to preserve amplitudes, and cannot generate offset gathers in a cost-effective manner, making it unsuitable for elastic inversion.
eGWM is the next evolution of WEM and provides a multi-path solution capable of imaging steep dips whilst intuitively attenuating noise and multiple energy. eGWM fully maintains amplitude integrity, and is unique in that it simultaneously outputs offset and AVA compliant angle gathers - ideal for AVO/AVA studies.
eGWM is positioned to replace all ray-based imaging methods, and at 30 times the efficiency of RTM, eGWM provides a faster and more energy efficient solution than conventional WEM.
Mungo, U.K. North Sea
RTM Runtime 42 DAYS @ 50Hz.
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RTM requires a massive run time yet produces steep events lacking correct amplitude and poor response at deep levels.
eGWM Runtime 1 DAY @ 80Hz.
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eGWM provides better imaged steep dips, subtle amplitude variations and cleaner events deeper down, after just 1 day.
Gulf of Mexico
Kirchhoff PSDM​
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In the shallow section, Kirchhoff is unable to resolve the complexity of the structure.
eGWM
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eGWM easily images complex faulting (centre), individual layers, and channelling (lower right).
Kirchhoff PSDM​
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Kirchhoff fails to effectively image the base of the salt and layers below.
eGWM
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eGWM greatly improves understanding of the salt geometry and layers beneath the salt. Unlike other WEM, there is no mode converted energy corrupting the image.
Our P&I Services
pre-processing
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Processing from field tapes
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eMULT proprietary de-multiple
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eBAND proprietary de-ghost
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Broadband
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Multi-azimuth
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Multi-client. multi-licence
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Land and Marine
Depth Imaging
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GRT true amplitude, AVA compliant
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eGWM ultra-fast wave equation migration
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Traditional migrations, e.g RTM, Kirchhoff
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VTI/TTI