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Micro-local linear noise suppression method and device

A technology of local linearity and noise suppression, applied in measurement devices, instruments, scientific instruments, etc., can solve the problems of difficult control, time-consuming, and large spatial changes.

Pending Publication Date: 2021-05-14
PETROCHINA CO LTD
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  • Application Information

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Problems solved by technology

Especially in the seismic records of complex surface areas, some micro-local linear noises often appear, and the frequency and amplitude vary greatly in space. Noise is time-consuming and difficult to control. This kind of micro-local linear noise suppression is one of the key technical problems in seismic exploration.

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  • Micro-local linear noise suppression method and device

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Embodiment Construction

[0050] Embodiments of the present invention provide a method and device for suppressing micro-local linear noise.

[0051] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0052] Due to the rough surface and variable near-surface lithology, a large amount of micro-local linear noise is generated. The purpose of the invention is to suppress micro-local linear noise, thereby improving the signal-to-noise ratio of seismic data in complex surface areas. like figure 1 Shown is a flowchart of a method for suppressing micro-...

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Abstract

The invention provides a micro-local linear noise suppression method and device. The method comprises the following steps: acquiring a three-dimensional common shot gather data volume and processing parameters; decomposing all common shot gather data in the three-dimensional common shot gather data volume into unilateral records; extracting local space-time window data from the unilateral record according to the processing parameters; determining the position of local linear noise according to the local space-time window data, and storing the local linear noise into a one-dimensional array; extracting micro-local data from the one-dimensional array, and performing specific median filtering to obtain micro-local linear noise; and subtracting the micro local linear noise from the unilateral record to obtain a denoised unilateral record. According to the method, the noise position is determined in the local space-time window by using the Radon transform, and then the micro-local linear noise is extracted by using the specific median filtering, so that the micro-local linear noise is suppressed, the signal-to-noise ratio of the seismic data in the complex surface area is improved, and the method has an obvious effect on suppressing the local linear noise.

Description

technical field [0001] The invention relates to the technical field of seismic data processing, in particular to a method and device for suppressing micro-local linear noise. Background technique [0002] Seismic exploration is a method of using the difference in elasticity and density of underground media to infer the shape of underground structures and the properties of rock formations by observing and analyzing the response of the earth to artificially excited seismic waves. Seismic prospecting is an important means of surveying oil and natural gas resources before drilling. Seismic prospecting is also widely used in coal field and engineering geological survey, regional geological research and crustal research. Seismic exploration is superior to other geophysical exploration methods in terms of layering detail and exploration accuracy. Seismic exploration is usually divided into refracted wave seismic exploration and reflected wave seismic exploration. At present, in th...

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Application Information

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IPC IPC(8): G01V1/36G01V1/32
CPCG01V1/36G01V1/364G01V1/32G01V2210/32G01V2210/34Y02T90/00
Inventor 徐基祥胡英崔化娟孙夕平曾庆才张征
Owner PETROCHINA CO LTD
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