Noise suppression method and device for seismic data
A technology for seismic data and noise suppression, which is applied in the field of geophysical exploration and can solve problems such as poor seismic data effect.
Active Publication Date: 2018-01-09
PETROCHINA CO LTD
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Problems solved by technology
However, in the actual seismic exploration process, the seismic signal may not meet the above prerequisites. If the method of the prior art is still used for random noise suppression, the effect of random noise data suppression in seismic data may be poor
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[0046] Embodiments of the present application provide a seismic data noise suppression method and device.
[0047] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described The embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.
[0048] An embodiment of the present application provides a seismic data noise suppression method. The seismic data noise suppression method provides frequency-space domain seismic data obtained by Fourier transform processing based...
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The embodiment of the invention discloses a noise suppression method and a device for seismic data. The method is used for subjecting the time-space domain-based seismic data to Fourier transformationto obtain frequency and space domain-based seismic data, wherein the frequency and space domain-based seismic data contain a plurality of single-frequency seismic data which are arranged according tothe frequency size thereof. The method comprises the following steps of acquiring a constraint factor corresponding to current single-frequency seismic data, wherein the constraint factor is obtainedby carrying out the noise suppression on target single-frequency seismic data, the target single-frequency seismic data is adjacent to the current single-frequency seismic data, and the frequency ofthe target single-frequency seismic data is smaller than that of the current single-frequency seismic data; carrying out noise suppression on the current single-frequency seismic data by utilizing theconstraint factor, so as to obtain the current single-frequency seismic data after noise suppression; based on the single-frequency seismic data after noise suppression, determining time-space domain-based seismic data after noise suppression. In this way, random noise data in the seismic data can be effectively compressed.
Description
technical field [0001] The present application relates to the field of geophysical exploration, in particular to a seismic data noise suppression method and device. Background technique [0002] According to the characteristics of noise on the seismic section, noise can usually be divided into regular noise and irregular noise. Regular noise mainly refers to noise with a certain main frequency and a certain apparent velocity, such as surface waves, alternating current interference, sound waves, shallow refraction, etc. Irregular noise, that is, random noise, mainly refers to waves with no fixed frequency and fixed propagation direction, forming a chaotic background in seismic data. Random noise is characterized by a wide frequency and no apparent velocity in seismic records, so it is difficult to suppress it by using the difference in frequency spectrum or the difference in propagation direction between random noise and effective wave. Due to the complexity of surface cond...
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Inventor 杨昊甘利灯李劲松孔丽云
Owner PETROCHINA CO LTD