Diffracted wave imaging method and diffracted wave imaging device based on dynamical features

Abstract

The invention relates to a diffracted wave imaging method and a diffracted wave imaging device based on dynamical features. The diffracted wave imaging method comprises the following steps of acquiring a reflected wave inclination field according to earthquake imaging data; optionally taking an imaging point and recording travel time information of a ray from a shot point to the imaging point and the information of incident angle of the imaging point; acquiring travel time information of a ground surface emergent ray corresponding to an emergent angle; setting an intersection point of the emergent ray and the ground as an initial stationary phase point; recording travel time information from the imaging point to various ground surface observation points; summing the travel time information and the travel time information of the ray from the shot point to the imaging point so as to obtain travel information of a diffraction ray; taking out an amplitude numerical value of corresponding time in various earthquake records and determining an actual stationary phase point; establishing a diffracted wave amplitude coefficient curvilinear equation; acquiring an amplitude attenuation value of a diffraction ray according to the travel time information of the diffraction ray, the travel time information of the emergent angle corresponding to the ground surface emergent ray and the actual stationary phase point; and performing summing after weighting the amplitude attenuation value of the diffraction ray and a corresponding ground amplitude numerical value so as to obtain imaging results of various corresponding imaging points in an underground imaging space range.

Description

technical field [0001] The invention relates to the field of seismic exploration, belongs to the technical category of seismic data imaging, and in particular relates to a diffraction wave imaging method and device based on dynamic characteristics. Background technique [0002] With the development of oil and gas field exploration and development, the detection of small-scale geological bodies has attracted more and more attention from the industry. Such geological anomalies usually exist in seismic data as diffracted waves. Therefore, mining useful diffraction information from seismic data has important application value in production. At present, seismic exploration is mainly based on reflection exploration, which cannot break through the limitation of the Ruili criterion, so it cannot effectively identify such geological bodies. [0003] Essentially, diffracted waves are carriers of seismic wave information for these complex structural geological anomalies. Complex res...

AI Technical Summary

Problems solved by technology

The basic diffraction is only a mathematical approximation, and there is a big difference in the dynamic characteristics of the real diffraction wave in the underground space. Therefore, it cannot handle the diffraction wave imaging problem well.

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