Gaussian-beam migration imaging method and system based on vertical seismic section data

Abstract

The invention discloses a Gaussian-beam migration imaging method and system based on vertical seismic section data. The method mainly comprises the steps of determining each shot point Gaussian beam and an imaging range, which changes along with an exit direction of a central ray, of each detection point Gaussian beam; acquiring underground stratigraphic dip field section prior information section, namely a prior information section acquired by using a ground seismic imaging result; computing a stratigraphic dip vector of an imaging point position of a Gaussian-beam cross region of each shot-detection pair; judging whether the stratigraphic dip vector is within the prior information section; and if yes, imaging the Gaussian beam of each single shot-detection pair within the Gaussian-beam cross region of the shot-detection pair according to the Gaussian-beam cross region of the shot-detection pair corresponding to the stratigraphic dip vector. The invention provides the method or utilizes the prior information, namely the underground dip information acquired by ground seism to restrain a Gaussian-beam migration imaging process, the stratigraphic dip beneficial to underground structure is selected, and the purpose of suppressing arcing noise is achieved.

Description

technical field [0001] The invention relates to the technical field of petroleum geophysical exploration seismic data processing, in particular to a Gaussian beam migration imaging method and system based on vertical seismic section data. Background technique [0002] Vertical Seismic Profile (VSP) data is a relatively special observation data relative to surface seismic data, that is, the seismic data received and recorded in ground excitation wells, which can help to confirm the details of the seismic structure next to the well, study faults, Fracture development, attenuation coefficient and other rock properties can also make full use of compressional and shear wave data to conduct comprehensive research on reservoirs and assist in the modeling, processing and interpretation of ground seismic data. However, the scope of the vertical seismic profile observation data is relatively small compared with the surface seismic data. In addition, the coverage of the imaging points ...

AI Technical Summary

Problems solved by technology

[0003] The traditional migration imaging method for vertical seismic profile data is the VSP-CDP conversion method, which can solve the arc noise of the vertical seismic profile, but it is only suitable for one-dimensional velocity models, that is, the assumptions of the VSP-CDP method based on ray tracing are too simple , cannot deal with the imaging problem of complex media

With the advancement of surface seismic imaging methods, there are corresponding studies on imaging methods corresponding to vertical seismic profile data, but none of these imaging methods can specifically solve the "arc drawing" noise problem of vertical seismic profile imaging

Both the wave equation method and the Kirchhoff imaging method are sensitive to insufficient vertical seismic profile data, and there is a serious "arcing" phenomenon

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