Seismic imaging method and device for direct imaging from undulating surface

Abstract

The invention provides a seismic imaging method and device for direct imaging from the undulating surface, which can directly obtain the imaging section from the common shot point gather, and the obtained processing result is more objective and real. The imaging method of the present invention comprises the following steps: 1. Select a reference plane according to the shot point position and the receiver point position of the common shot point gather, and preset the position of the imaging surface element point at a certain interval on the reference plane; 2. The position of the shot point and the receiver point, as well as the preset scanning time and the average speed of the medium determine the position of the virtual image point; 3. The position of the shot point, the receiver point and the virtual image point, combined with the position of the imaging bin point, determines the dew point and the position of the reflection point reflected from the shot point to the receiver point; 4. Calculate the normal two-way travel time from the imaging bin point to the reflection point and the time correction amount of the imaging point bin relative to the dew point; 5. The ellipse expansion and tangent interferometric stacking imaging processing is performed to obtain the zero-offset time section.

Description

technical field [0001] The invention relates to the technical field of seismic data processing, in particular to a seismic imaging method and device for direct imaging from undulating surfaces. Background technique [0002] With the continuous development of seismic exploration technology, the requirements for the processing technology of the collected seismic exploration data are also getting higher and higher. In actual seismic data processing, reflection seismic data processing technology in seismic exploration data involves the category of stacking imaging technology in the process of seismic data processing. Most of the existing reflection seismic data processing and imaging methods require the shot point and the receiver point to be located on the same horizontal plane, and assume that the underground medium is layered and uniform. With the deepening of exploration work, the surface geological and seismic conditions of the exploration target and the exploration area a...

AI Technical Summary

Problems solved by technology

However, the premise of the application of this method is that there must be a relatively stable low speed drop zone.

Generally, there is no low speed drop zone or a relatively stable low speed drop zone in mountainous areas, so the application effect of refracted wave static correction cannot be guaranteed.

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