• 2008年全球金融危机之后,为什么金融危机发源地的美国,欧债危机重灾区的欧洲各国股市连续7年走牛,屡创历史新高,唯经济最好的中国股市却连续7年熊冠全球?去年中国 2018-11-17
  • 完成自己的第一部电影, 她23岁就做到了 2018-11-17
  • 时时彩后一杀号大全:Full Waveform Inversion

    后一万能码 2期内中 www.qgqx.net Full-Waveform Inversion (FWI) derives high-resolution velocity models by minimizing the difference between observed and modeled seismic waveforms. It goes beyond refraction and reflection tomography techniques, which use only the travel time kinematics of the seismic data, by using additional information provided by the amplitude and phase of the seismic waveform.

    The highly detailed models provided by FWI can be used to resolve complex geological features, as well as aid in identifying potential geohazards. These high-definition models can also be input directly to pore pressure prediction flows, time-lapse monitoring and reservoir characterization analysis. Subsurface images produced using these highly accurate models provide interpreters with a much higher degree of confidence with respect to reservoir delineation and subsequent well planning.

    Many areas across the world share a common issue – complex near-surface conditions such as shallow gas anomalies, sediment carapace, permafrost, volcanic intrusions and paleo-canyons. FWI is well suited to handling these challenges."

    Anisotropy & cycle skipping

    Our FWI algorithms honor anything from isotropy to orthorhombic anisotropy. In FWI, the problem of cycle-skipping occurs when the difference in arrival time between modeled and observed data is larger than a half-cycle of the dominant frequency. It can cause the algorithm to converge on a wrong local solution. We have developed technology and workflows to mitigate this issue, especially for data with a lack of low-frequency signal or with a less accurate starting model.

    Reflection-based FWI

    Our latest reflection-based FWI technology allows us to resolve complex geological challenges by utilizing both refraction and reflection data. The addition of reflection information improves the velocity model beyond diving-wave penetration depths, resulting in significantly better ultra-deep images. In areas such as the Gulf of Mexico, reflection-based FWI delivers improvements to salt model accuracy and subsalt imaging.

     

    This FWI example extracted from our 25,000 km2 BroadSeis? multi-client survey offshore Gabon shows the level of detail provided for interpreters.

    Orthorhombic full-waveform inversion for imag...

    Yi Xie | Bin Zhou | Joe Zhou | Jiangtao Hu | Lei Xu ...
    ?2017 SEG

    Extracting geological information directly fr...

    Nick Benfield | Vishram Rambaran | Joel Dowlath | Tom Sincla...
    ?2017 SEG

    An offshore Gabon full-waveform inversion cas...

    Bingmu Xiao | Nadezhda Kotova | Samuel Bretherton | Andrew R...
    ?2016 SEG
    Offshore - BroadSeis

    BroadSeis

    Broadest bandwidth, best low frequencies deliver accurate models for better decisions. Choose BroadSeis at all stages from exploration to production.

    Subsurface Imaging - Least-Squares Migration

    Least-Squares Migration

    Least-Squares Migration provides images with better balanced illumination, improved signal-to-noise ratio, reduced migration artifacts and more interpretable seismic amplitudes.

    Multi-Client Data - Gabon

    Gabon

    Over 25,000km2 PSDM seismic data available as part of a complete geoscience package including regional geological analysis in this prospective area.
    Subsurface Imaging

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  • 2008年全球金融危机之后,为什么金融危机发源地的美国,欧债危机重灾区的欧洲各国股市连续7年走牛,屡创历史新高,唯经济最好的中国股市却连续7年熊冠全球?去年中国 2018-11-17
  • 完成自己的第一部电影, 她23岁就做到了 2018-11-17