Suppression method and suppression device for surface wave interference for seismic record
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.
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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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