A method and device for suppressing multiple waves

Abstract

An embodiment of the invention discloses a method and a device for compressing multiples. Well logging data of target work areas and post-stack seismic data of time domains of the work areas can be provided by the method. The method includes determining formation reflection coefficient curve data of well drilling locations of the target work areas according to acoustic wave time difference well logging curve data and density well logging curve data in the well logging data; determining to-be-processed seismic data on the basis of the formation reflection coefficient curve data and determiningseismic sub-data corresponding to target reflection source interfaces in the post-stack seismic data of the time domains; carrying out multiple compressing processing on the to-be-processed seismic data according to the seismic sub-data. The to-be-processed seismic data are used for characterizing seismic data in the post-stack seismic data of the time domains, and the seismic data contain the multiples. Multiple generating reflection interfaces can be represented by the target reflection source interfaces. According to the technical scheme, the method and the device in the embodiment of the invention have the advantage that the inter-formation multiples can be effectively compressed by the aid of the method and the device.

Description

technical field [0001] The present application relates to the technical field of processing and interpretation of petroleum geophysical exploration seismic data, in particular to a method and device for suppressing multiple waves. Background technique [0002] When the reflected wave travels upward and encounters an interface with a large wave impedance difference, the reflected wave may reflect from this interface and propagate downward. When the reflected wave encounters the reflecting interface, it will be reflected back to the ground (sea) surface again, thus forming multiple waves. According to the position of the reflecting layer, the multiples can be divided into the following types: full range multiples, interlayer multiples, microbending multiples and ringing multiples. Among them, the interlayer multiple waves are mixed among the effective waves (namely primary waves), superimpose and interfere with each other with the primary waves, so that the wave field charact...

AI Technical Summary

Problems solved by technology

In onshore exploration, due to the instability of the shallow stratum structure, the surface multiples are not as obvious as the offshore data, while the onshore interlayer multiples are more complex, without obvious features, and are often difficult to detect. Correctly judge the interface position of interlayer multiple waves on the seismic section, so it is difficult to identify and remove them in data processing

[0004] At present, interlayer multiple suppression methods mainly focus on suppressing interlayer multiples in pre-stack seismic data. , the characteristics of the multiple wave field are relatively complex, and the existing methods cannot completely and effectively attenuate interlayer multiple waves

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