Simulated annealing ghost reflection suppression method and offshore seismic exploration system

Abstract

The invention belongs to the technical field of ghost reflection suppression, and discloses a simulated annealing ghost reflection suppression method and an offshore seismic exploration system. The method comprises the steps of giving an initial solution group and a constraint array of three parameters R, [delta]ts and [delta]tr, and giving an initial temperature T, a termination temperature Tj and an iteration frequency L; adopting an optimized simulated annealing algorithm to respectively give values of an attenuation function parameter [alpha], an ultra-fast annealing parameter C and a quenching factor Q; generating a group of new solutions every time iteration is carried out, and searching an optimal solution group according to the L1 norm of an error between the seismic record obtained by comparing the new solutions and the old solutions and the original record in a step-by-step approximation mode; the group of solutions with the small L1 norm is reserved and participates in the next iteration, and the group of solutions with the large L1 norm is abandoned so as to find the optimal parameter solution; and the effectiveness of the method is verified through ghost reflection pressing processing. According to the method, ghost reflection can be effectively suppressed, and parameters of a ghost wave operator can be accurately solved; and the segmented annealing mode can ensureuniform temperature drop and improve inversion efficiency and precision.

Description

technical field [0001] The invention belongs to the technical field of ghost reflection suppression, and in particular relates to a simulated annealing ghost reflection suppression method and a marine seismic exploration system. Background technique [0002] At present, the closest existing technology: In the process of offshore seismic exploration, in order to reduce the received sea surface noise, increase the frequency of the source wavelet, and suppress the bubble effect of the airgun source, both the source and the receiver are placed in seawater A certain depth below the surface. The sea surface is a strongly reflective interface. When the seismic waves excited by the source propagate directly to the sea surface or the seismic waves reflected from the seabed propagate to the sea surface, they will be reflected by the sea surface and received by the geophone. The waves reflected by the sea surface are ghost reflections. After the source is excited, the seismic wave pro...

AI Technical Summary

Problems solved by technology

[0008] To sum up, the problems existing in the existing technology are: none of the existing methods can reduce the error caused by the domain change, restore the effective signal, suppress the ghost reflection, and make the ghost reflection event weaken or even disappear as much as possible.

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