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Multi-source seismic wave field separating method by utilizing random denoising technology

A technology of seismic wave field and separation method, which is applied in the field of petroleum exploration, can solve the problems of unclean wave field separation and limited application range, and achieve good imaging effect

Inactive Publication Date: 2014-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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  • Claims
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Problems solved by technology

This type of method generally has a better separation effect, but the scope of application is limited; the other type does not require the type of collected data, but when there are a large number of synchronous sources, most of them have the problem of unclean wave field separation

Method used

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  • Multi-source seismic wave field separating method by utilizing random denoising technology
  • Multi-source seismic wave field separating method by utilizing random denoising technology
  • Multi-source seismic wave field separating method by utilizing random denoising technology

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Embodiment Construction

[0019] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0020] The current multi-source seismic acquisition does not have strict consistency requirements on the excitation time of the synchronous sources, so there is a random time difference between the synchronous sources, so that the noise of the interference shot in the common shot gather is correlated, and the total When the shot data is transformed into non-common shot gathers such as common center point gathers or common receiver point gathers, due to the random time difference between the synchronous excitation shots, the noise of the interferometric shots is random, and the random denoising technology can be used to The random noise generated by the interferometric shot signals can be removed, and when the data is re-transformed into a common shot set, the noise of the interferometric shot is eliminated, thereby realizing the wavefield separation of the multi-source...

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Abstract

The invention provides a multi-source seismic wave field separating method by utilizing a random denoising technology, and belongs to the field of oil exploration. The method comprises the following steps: performing data exchange first, that is, converting common-shot-gather data into non-common-shot-gather data; then utilizing a random denoising method to remove the interference shot noise generated by interference shot signals in the non-common-shot-gather data; finally, performing data inverse transformation, that is, converting the non-common-shot-gather data into the common-shot-gather data again, so as to realize the wave field separation of multi-source seismic data. As for the seismic data of 10 or more synchronous-source seismic events, when the method is adopted for respectively performing conventional processing, pre-stack time shift and post-stack depth migration, a better imaging effect can be always achieved.

Description

technical field [0001] The invention belongs to the field of petroleum exploration, and in particular relates to a random denoising multi-source seismic wavefield separation method, which is used for pre-processing seismic data of multi-source synchronous excitation (vibroseis synchronous scanning) in oil and gas exploration. Background technique [0002] Multi-source synchronous excitation seismic technology is a high-efficiency seismic acquisition technology, which has begun to be practical in foreign countries. However, due to the mutual interference of wave fields excited by synchronous sources, data processing is extremely difficult. Using multi-source wave field separation technology to decompose multi-source seismic data into single-source seismic data, and then use the existing single-source processing technology to process it is the main method of existing multi-source seismic data processing, so the multi-source seismic data The effective separation of seismic data...

Claims

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Application Information

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IPC IPC(8): G01V1/28G01V1/36
Inventor 佘德平杨丽薛诗桂
Owner CHINA PETROLEUM & CHEM CORP
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