Simultaneous sources

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Simultaneous sources acquisition is a new acquisition to reduce acquisition cost. With more than one sources or air guns fired simultaneously, acquisition time and cost can be reduced significantly. As the recorded dataset are blended together in simultaneous acquisition, a following deblending process is usually needed before any further denoise and analysis.

Deblending methods are different due to the differences of sources in land and marine acquisition system.

Land simultaneous acquisition

Land simultaneous acquisition are usually configured by several vibroseises, which are fired with signatures coded differently (orthogonally). The recorded blended dataset are correlated with each signature and yield the related clean deblending result.

Marine Simultaneous acquisition

For marine acquisition, it is not easy to "code" the signature for airguns. Thus, airguns are usually shooted at a random firing time, which makes the interfering shots becoming random spikes in common receiver, offset or CMP domain (as shown in Figure 1). Despiking methods such as median filter (Shoudong 2012 [1]) and singular spectral analysis (Jinkun 2015 [2]) can be used for the deblending marine simultaneous data. Iterative denoise approaches can improve deblending performances.

Fig 1. blended records of random firing time in different domain (Gary, 2008 [3]).


References

  1. Huo, Shoudong, Yi Luo, and Panos G. Kelamis. "Simultaneous sources separation via multidirectional vector-median filtering." Geophysics 77.4 (2012): V123-V131.
  2. Cheng, Jinkun, and Mauricio D. Sacchi. "Separation and reconstruction of simultaneous source data via iterative rank reduction." Geophysics 80.4 (2015): V57-V66.
  3. Hampson, Gary, Joe Stefani, and Fred Herkenhoff. "Acquisition using simultaneous sources." The Leading Edge 27.7 (2008): 918-923.