Wave field purification treatment method

Abstract

The invention provides a wave field purification treatment method, belonging to the field of earthquake information processing of geophysical prospecting. The method disclosed by the invention comprises the following steps of converting a shot-gather processing region into a common offset processing region according to an objective principle that reflection forms of noises reflected in different regions are different, and converting noises of a stacked shot interference phase in a record into random noises; and then, utilizing FX deconvolution in the common offset processing region to suppress a stacked shot record. With the adoption of the method disclosed by the invention, high-quality data can be obtained and the quality of a processing result is greatly improved. The method disclosed by the invention can be applied to two-dimensional information and can also be applied to three-dimensional information. The method disclosed by the invention can keep previous wave group characteristics and lays a good foundation for subsequent extraction of pre-stack attributes and oil-gas possibility researches. The method disclosed by the invention has good application prospects on aspects of improving the quality of the result and the interpretability.

Description

technical field [0001] The invention belongs to the field of seismic data processing in geophysical exploration, and specifically relates to a wave field purification processing method, which can be applied to the processing of overlapping shot records that occur in intensive excitation in vibrator seismic exploration, and can also be applied to other seismic sources Handling of overlapping guns, machinery, etc. interference in exploration records. Background technique [0002] Pre-stack denoising of seismic data is one of the key steps in seismic data processing for exploration. In vibrator seismic surveys, dense firing for efficiency results in a large number of overlapping shots in the record. Since the overlapping shots in the original seismic records are usually mixed with the normal reflection wave records in the form of coherent noise, their energy and frequency are similar, and the wave groups have no obvious rules to be found, so it is difficult to suppress the ove...

AI Technical Summary

Problems solved by technology

Since the overlapping shots in the original seismic records are usually mixed with the normal reflection wave records in the form of coherent noise, their energy and frequency are similar, and the wave groups have no obvious rules to be found, so it is difficult to suppress the overlapping shot records

[0003] In order to prevent the overlapping shot records from having an excessive impact on the processing results, the current existing technology adopts the following method: when collecting, the shooting time of different excitation points will be separated for a period of time, and the deep overlapping shot records will not be targeted during processing. The processing is only to use superimposition to suppress it, so as to ensure that the signal of the main target layer will not be seriously affected; in individual cases, for overlapping shot records that appear in the shallow and middle parts, partial removal is generally adopted, but this is It is not conducive to the extraction of pre-stack attributes and oil and gas research

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