A method and device for detecting uniformity of wave field excited by a vibrator

Abstract

The invention provides a method and equipment for detecting the uniformity of a wave field excited by a vibrator, which are applied in the technical field of seismic exploration. The method includes: collecting wave field signals generated during the excitation process of the vibrator; and determining the uniformity of the wave field excited by the vibrator by comparing the wave field signals at the same distance from the vibrator vibrator in different azimuths. The equipment includes: a signal acquisition device for collecting wave field signals generated during the excitation process of the vibrator; a uniformity analysis device for comparing wave field signals at the same distance from the vibrator vibrator in different directions to determine the Vibroseis excites the uniformity of the wave field. The invention can be used to guide the design and production of high-precision vibroseis, which is beneficial to reduce the influence of the vibrator itself on the anisotropy of seismic waves, and can also be used to evaluate the excitation effects of different types of vibroseis. As an excitation source, it provides a reliable basis for whether the anisotropy in the final seismic data has an impact.

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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