Normal moveout stretch cutting method for processing geophysical exploitation seismic data

Abstract

The invention provides a normal moveout stretch cutting method for processing geophysical exploitation seismic data. According to the method, a stacking velocity field is utilized, average speed is calculated, or interval velocity is calculated after smoothing the average speed. Further, by using the velocity and shot-geophone distance information, approximate calculation of an incident angle is performed according to the theory of ray (straight ray or curved ray) propagated by seismic wave, and a 1D or 3D space varying incident angle threshold value reference is used as a standard of measurement to determine the cut of each seismic channel. Thus, more accurate automatic cutting of the normal moveout stretch is realized, the interference caused by net normal moveout stretch can be cut, effective wave amplitude can also be protected to the greatest extent, and finally, the resolution and the signal-noise ratio of a stacked section are improved.

Description

technical field [0001] The invention relates to a seismic data processing method, in particular to a dynamic correction stretching and cutting method for processing geophysical seismic data; the method belongs to the geophysical exploration method, and is especially suitable for accurate identification of underground strata by using geophysical means and geophysical prospecting data processing. Background technique [0002] Seismic data processing is an important part of petroleum seismic exploration. The entire seismic data processing process is to process the original seismic data collected by field seismic data through a series of processing to remove the false and preserve the true, and finally provide a seismic section that can reflect the underground geological structure for comprehensive interpretation. [0003] In order to ensure a high enough signal-to-noise ratio in seismic data processing, multiple coverage techniques must be used in industry, and the resulting d...

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Problems solved by technology

[0009] However, it is obviously unreasonable to artificially divide two adjacent traces with similar offsets into short traces and far traces, which leads to a large gap in the resection amount of traces with similar offsets, (see Figure 1c ), which essentially cuts off a lot of effective waves, therefore, still fails to fundamentally overcome the fatal flaw of this cutting method

Therefore, this cutting method is still far from reaching the practical purpose, or in other words, this cutting method according to the incidence angle cannot be put into the practical processing and application of seismic data.

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