Pressing method for true 3-d seismics data linear noise

Abstract

The invention relates to a pressing method for using three-dimensional seismic data to process linear noise of the three-dimensional seismic data, belonging to the oil geophysical exploration field. The concrete steps are that: high density seismic data is collected and recorded; the data is divided into data groups with smallest data sets; rank ordering is carried out on all paths of each data group according to the shot-geophone distance and the azimuth, thus forming a three dimensional denoising smallest data set; the linear noise speed is analyzed according to the formed frequency wave-number spectrum (FK spectrum) or the original seismic data so as to eliminate the linear noise; pressing on the existing linear noise is repeated until the noise is eliminated. The pressing method is applicable to different seismic data collected by observation systems, in particular to non-cross banding and irregular bunchy orthogonality observation system, thus pressing the linear noise of the original data well.

Description

technical field [0001] The invention belongs to petroleum geophysical exploration technology, in particular to a method for suppressing linear noise of true three-dimensional seismic data in three-dimensional seismic data processing. Background technique [0002] In the process of seismic data acquisition and processing of petroleum seismic exploration, some regular interference waves, such as surface waves or shallow multiple refraction waves, are encountered, which have strong energy and bring great difficulties to improve the signal-to-noise ratio of seismic data. The processed data is not true and accurate. At present, a two-step noise suppression method is usually adopted, that is, the suppression is carried out in the X direction and the Y direction respectively. This is not only inefficient, but also because linear noise is linear in three-dimensional space, but not linear in non-vertical two-dimensional lines, so the suppression effect of two-dimensional denoising i...

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Problems solved by technology

This is not only inefficient, but also because linear noise is linear in three-dimensional space and not linear in non-vertical two-dimensional lines, so the suppression effect of two-dimensional denoising in two directions is not very ideal.

[0003] At present, although there is a method suitable for suppressing three-dimensional linear noise suppression (FKxKy), it is suitable for cross-arrangement or can form a cross-arrangement orthogonal beam wide azimuth observation system

For the irregular observation system, it is difficult to perform three-dimensional linear noise suppression for the linear noise in the data collected by the non-criss cross arrangement and the irregular beam orthogonal observation system

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