Aliasing seismic data acquisition system and method

Abstract

The invention discloses an aliasing seismic data acquisition system and method. The method comprises the steps of: determining the source interval according to the coordinate information of a seismicsource; determining the excitation mode of the seismic source based on the incidence relation between the source interval and the excitation mode of the seismic source according to the source interval, the excitation mode of the seismic source comprising sliding scanning excitation or independent excitation; obtaining the state information of detector arrangement, and determining whether the excitation state of the seismic source is excitable or non-excitable according to the state information of detector arrangement; according to the excitation mode of the seismic source, exciting the seismicsource of which the excitation state is excitable; and after the seismic source is excited, monitoring the quality of collected seismic data in real time. The requirement of aliasing seismic data separation for the excitation mode and the excitation interval is met, and the aliasing seismic data with high quality can be obtained while the production efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of seismic data acquisition, in particular to an acquisition system and method for aliasing seismic data. Background technique [0002] The cost of onshore vibroseis operations depends on the length of time required for data recording per shot and the time required to move the site. The length of time required for data recording per shot depends on the number of scans, scan length, and listening time. For example, if there are 4 scans per shot, with a scan length of 8 seconds, each with a 7-second listening time, then at least 60 seconds to complete a shot. Add to that the typical data acquisition system record preparation time, which takes about 3 to 5 seconds. [0003] The prior art includes a cascaded vibroseis scanning method for eliminating unproductive listening time, which involves a series of incrementally phase-rotated scanning segments, using different cascades of such scanning to suppress harmon...

AI Technical Summary

Problems solved by technology

In this method, each record needs to be correlated multiple times, and then superimposed to form separate records, which is not efficient

At the same time, due to the large distortion in the response of the seismic source to the random signal, the excitation effect is not ideal

[0008] In addition, the limitation of distance-separated synchronous scanning technology is that it occupies a large amount of equipment. This technology requires a huge space to meet the conditions of independent excitation or independent excitation signal-to-noise separation; the characteristic of random independent excitation technology is the distance between seismic sources and the excitation time. It is a random state that can achieve extremely high efficiency. Its disadvantage is that the signal-to-noise separation effect is not good

[0009] To sum up, the aliasing seismic data collected by the existing technology has strong aliasing interference when the aliasing seismic data is separated, resulting in poor quality of the aliasing seismic data

[0010] For the above problems, no effective solutions have been proposed so far

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