Method and equipment for detecting uniformity of vibroseis excitation wave field

Abstract

The invention provides a method and equipment for detecting the uniformity of a vibroseis excitation wave field. The method and equipment are applied to the technical field of seismic exploration. The method includes the steps that wave field signals generated in the vibroseis excitation process are collected; the uniformity of the vibroseis excitation wave field is determined by comparing wave field signals of different orientations of positions the same distance away from a vibroseis vibrator. The equipment comprises a signal collecting device and a uniformity analysis device, wherein the signal collecting device is used for collecting the wave field signals generated in the vibroseis excitation process and the uniformity analysis device is used for determining the uniformity of the vibroseis excitation wave field by comparing the wave field signals of the different orientations of positions the same distance away from the vibroseis vibrator. The method and equipment can be used for guiding high-precision vibroseis design and production, facilitate reduction of the effect of a vibroseis itself on seismic anisotropy and can also be used for evaluating the excitation effects of different types of vibroseises and providing reliable evidence for judging whether the vibroseis serving as an excitation source affects the anisotropy in final seismic data or not.

Description

technical field [0001] The invention relates to the technical field of seismic exploration, in particular to a method and equipment for detecting the uniformity of a wave field excited by a vibrator. Background technique [0002] With the development of the national economy relying on environmental resources, oil and gas exploration and other environmental resource exploration activities are developing from conventional exploration to high-density and high-precision. Vibroseis is an important excitation link in seismic exploration. Whether it can meet the needs of high-precision seismic exploration is very important. [0003] In the stage of research on the optimal design of high-precision vibrator excitation signals, it was found that the near-source surface wave field of the conventional vibrator excitation signal and the near-source surface wave field of the pre-designed low-frequency vibrator excitation signal were significantly different, mainly in The difference in ph...

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Problems solved by technology

[0004] At present, in the exploration of oil and gas resources using vibroseis as the excitation source, most people think that the anisotropy in the received seismic data is caused by geological reasons such as the heterogeneity of the earth, and rarely consider using vibroseis as the excitation source. Whether the excitation source itself will affect the anisotropy of the final seismic data in the process of exciting seismic waves, and how to provide a corresponding analysis on the possible excitation non-uniformity of seismic waves excited by vibroseis through a detection and analysis method with judgment

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