Suppression method and suppression device for surface wave interference for seismic record
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A technology for seismic recording and interference suppression, applied in seismic signal recording, seismic signal processing, etc., can solve problems such as inability to get rid of surface wave dispersion, line-of-sight problems, strong surface wave energy, etc.
Active Publication Date: 2013-02-27
CHINA UNIV OF PETROLEUM (BEIJING)
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Compared with the two-dimensional coherent noise suppression method, this method has a stronger ability to suppress surface waves, but it still cannot get rid of the line-of-sight problem caused by surface wave dispersion, and the seismic records after processing still have strong surface wave energy
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Embodiment 1
[0193] Below in conjunction with the embodiment and accompanying drawing of block A of certain oil field. The embodiments of the present invention will be further described in detail.
[0194] (1) Using conventional technology to collect seismic records x i (t), i=1, 2, ... n, wherein, n is the number of seismic traces, n=186 in this example, as Figure 5 Shown is the seismic record x collected in the embodiment of the present inventioni (t) Waveform diagram. The broom-shaped strong energy surface wave interference can be clearly seen, and the shadow of the signal can hardly be seen in the area polluted by the surface wave interference;
[0195] (2) Determine the high cut-off frequency f of surface wave interference g , the specific steps to remove:
[0196] (2.1) For seismic records x i (t), i=1, 2,...n do Fourier transform, calculate its amplitude spectrum A i (f), i=1, 2, ... n, where
[0197] X i ( f ...
Embodiment 2
[0226] This embodiment is an application example of block B of an oil field, where the surface is covered by sand dunes, and surface wave interference is very serious. The exploration target layer is about 7,000 meters of carbonate oil and gas reservoirs, with large burial depth, weak reflection, and low signal-to-noise ratio. Suppressing noise interference and restoring effective signals are the key to breakthroughs in exploration work in this block.
[0227] Such as Figure 7 As shown, it is the seismic record x collected by block B in Embodiment 2 of the present invention i (t) Waveform diagram. The broom-shaped strong energy surface wave interference seriously pollutes the seismic signals within the medium offset.
[0228] Using the cone filter technology in the seismic data processing system in the industry to suppress the surface wave processing, the obtained results are as follows: Figure 8 The waveform result shown in the figure; although the surface wave interfere...
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Abstract
The invention relates to a suppression method and a suppression device for surface wave interference for a seismic record. The suppression method comprises the steps of acquiring a seismic record xi(t), acquiring a surface wave interference high cut-off frequency fg according to the seismic record xi(t), confirming a changing curve q(t) according to the surface wave interference high cut-off frequency fg, acquiring a seismic record yi(t) of a surface wave interference frequency band by conducting low-pass filtering with a high cut-off frequency of fg on the seismic record xi(t), acquiring a seismic record zi(t) of non-surface wave interference frequency range by conducting band-pass filtering with a low cut-off frequency of fg and a high cut-off frequency of 2fg on the seismic record xi(t), acquiring an amplitude variation curve py(t) according to the seismic record yi(t) of the surface wave interference frequency band, acquiring an amplitude variation curve pz(t) according to the seismic record zi(t) of the non-surface wave interference frequency range, acquiring an interference frequency band seismic record by modulating an surface wave interference frequency range yi(t) according to the changing curve q(t), the amplitude variation curve py(t) and the amplitude variation curve pz(t), and acquiring a seismic record after surface wave interference suppression according to the surface wave interference frequency range yi(t) and the seismic record xi(t) of the interference frequency band seismic record.
Description
technical field [0001] The invention relates to the field of seismic record processing, in particular to a method and device for suppressing seismic record surface wave interference. Background technique [0002] Seismic exploration is an exploration method that uses artificial seismic technology to detect underground structures. It artificially stimulates seismic waves in a certain way, uses a device called a geophone to receive reflection signals from the ground, and detects underground structures through processing and analysis of reflection signals. [0003] While receiving seismic signals, the geophone device also receives various types of noise interference. How to effectively suppress noise and restore seismic signals polluted by noise is an important research content of seismic data processing for exploration. [0004] Among all kinds of noise interference, surface wave is the most common and most difficult to suppress noise interference. Compared with effective si...
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