1887

Abstract

Summary

We have improved the so-called QPSTM by introducing a dip-angle domain stationary-phase implementation. QPSTM compensates absorption and dispersion via an actual wave propagation path using effective Q parameters. However, this strongly degrades the resolution gained by the compensation and requires more computational effort than conventional PSTM. Our stationary-phase implementation improves QPSTM through the determination of an optimal migration aperture based on an estimate of the Fresnel zone. This significantly attenuates the noises and reduces the computational cost of 3D QPSTM. We have estimated the 2D Fresnel zone in terms of two dip angles through building a pair of 1D migrated dip angle gathers using PSTM. Our stationary-phase QPSTM was implemented as a two-stage process. First, we used conventional PSTM to obtain the Fresnel zones. Then, we performed QPSTM with the Fresnel-zone-based optimized migration aperture. We apply the QPSTM to the actual 3D seismic data, obtain higher resolution imaging results, and verify the practicability of the method.

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/content/papers/10.3997/2214-4609.201800647
2018-06-11
2024-03-28
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References

  1. ZhangJianfeng et al.
    2013, Compensation for absorption and dispersion in prestack migration: An effective Q approach: Geophysics,78, no.1,S1–S14
    [Google Scholar]
  2. 2016, High-resolution imaging: An approach by incorporating stationary-phase implementation into deabsorption prestack time migration: Geophysics,78, no. 1,S317–S331
    [Google Scholar]
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