Research and Application of Adaptive Ghost Wave Suppression Method in Time-Space Domain

Abstract

Summary Source ghost waves and cable ghost waves can generate frequency trapping effects, resulting in the loss of low-frequency and high-frequency information in seismic data, seriously affecting the imaging quality of seismic data, and increasing the difficulty of later seismic data interpretation and reservoir inversion. The ghost wave delay time can be expressed as a function of the depth of the detector. When the cable depth is accurate, the difference between the total wave field minus the primary wave field and the ghost wave energy should be minimized. Convert the automatic optimization problem of cable depth into a least squares problem, and obtain the true cable depth by solving the objective function. By scanning the depth of the cable and combining it with the matching subtraction algorithm, accurate cable depth can be obtained. Design an anti filter to effectively suppress ghost waves. By designing a single-layer reflection model for algorithm testing, the effectiveness of this method is verified. After removing ghost waves, the energy of the trap points has been greatly restored and improved, and the energy of the low-frequency and high-frequency ends of seismic data has been well improved. Adaptive ghost wave suppression technology can effectively suppress source ghost waves and cable ghost waves, achieving the goal of eliminating traps, expanding seismic frequency bands, and improving seismic data resolution. This method not only has good processing results in actual marine seismic data processing, but also has high processing efficiency and good applicability to seismic data. It can be well applied to conventional horizontal cable seismic data and oblique cable seismic data. Significant improvement in the quality of seismic data provides an important data foundation for reservoir research.