Normal moveout stretch cutting method for processing geophysical exploitation seismic data

A seismic data and dynamic correction technology, which is applied in the field of dynamic correction stretching excision and geophysical exploration data processing, can solve problems such as unpracticality, large gap in excision amount, and inability to be put into practical application of seismic data processing. Precise automatic cut-off, protection of significant wave amplitude, resolution and improved signal-to-noise ratio

Active Publication Date: 2012-08-15
PETROCHINA CO LTD
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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, therefor

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  • Normal moveout stretch cutting method for processing geophysical exploitation seismic data
  • Normal moveout stretch cutting method for processing geophysical exploitation seismic data
  • Normal moveout stretch cutting method for processing geophysical exploitation seismic data

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[0050] The dynamic correction stretching and cutting method for processing geophysical seismic data described in the present invention is an improvement to the constant threshold value and the technology of cutting according to the incident angle, and the original constant incident angle threshold value is changed to the incident angle that changes with the offset Threshold value, we call this cutting method 1D space-varying threshold value, cut off by incident angle technology. During the research and development of this technology, it was found that due to the difference in underground geological conditions and structural forms, the lateral change of the superimposed velocity field is very drastic, which leads to a large lateral difference in the calculated incident angle, resulting in a 1D spatial variation threshold Can not be suitable for cutting needs everywhere in the work area. This prompts us to further develop the 3D space-varying threshold value and incident angle c...

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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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Application Information

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IPC IPC(8): G01V1/36
Inventor 郭平高树生柳世光邹洪学张淑梅高源季占真
Owner PETROCHINA CO LTD
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