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Diffracted wave separation processing method based on reflection wave layer leveling extraction and elimination

A technology of separation processing and diffracted waves, applied in seismic signal processing and other directions, can solve problems such as unfavorable pre-stack attribute extraction, and achieve the effect of overcoming low fidelity

Active Publication Date: 2012-11-14
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

This method is only applied to post-stack data, which is not conducive to research such as pre-stack attribute extraction.

Method used

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  • Diffracted wave separation processing method based on reflection wave layer leveling extraction and elimination
  • Diffracted wave separation processing method based on reflection wave layer leveling extraction and elimination
  • Diffracted wave separation processing method based on reflection wave layer leveling extraction and elimination

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Embodiment Construction

[0040] The present invention is further described below in conjunction with embodiment. The present invention includes but is not limited to the contents involved in these embodiments.

[0041] forward simulation

[0042] Such as figure 1 As shown, it is a physical model of a double-layer medium. The upper medium is a uniform medium with a velocity of 1500m / s, and the surrounding rock velocity of the lower medium is 2300m / s. Relatively low velocity (1800m / s, 1900m / s, 2000m / s s, 2100m / s), caves and cracks of different sizes and shapes.

[0043] The technical method of the present invention is used to process the physical model data (including in the process: data input, conventional preprocessing, velocity analysis, CDP gather sorting, superimposition, extraction horizon leveling time, dynamic and static correction, shot collection sorting , layer leveling shot records, median filtering to extract reflected waves, subtraction, extraction of diffracted wave records, reverse ...

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Abstract

The invention relates to a diffracted wave separation processing method based on reflection wave layer leveling extraction and elimination. The diffracted wave separation processing method comprises the following steps that (1) the processing is carried out; (2) the CDP (common depth point) gather record in the preprocessing is subjected to dynamic correction and static correction processing, and the shot gather record is generated according to trace header information; (3) the target level picking is carried out according to superposition data, the level leveling time quantum is extracted, and the level leveling time information is reflected onto each trace record in the prestack shot gather record according to the relationship of each trace record in the CDP and shot gather record; (4) the reflection wave layer leveling processing of the prestack shot record is carried out according to the level leveling time quantum; (5) the reflection wave layer leveling shot gather is recorded, reflection waves are extracted and are subtracted from original records, and the diffracted wave shot record is obtained; (6) the diffracted wave shot record is subjected to reverse leveling processing; (7) the shot gather record is withdrawn to the CDP gather record, and the superposition processing is carried out; and (8) the velocity field obtained through velocity analysis is subjected to migration processing, and diffracted wave migration imaging result data is obtained.

Description

technical field [0001] The invention relates to the field of geophysical exploration seismic data processing, in particular to a diffraction wave separation processing method based on reflection wave layer leveling, extraction and elimination. Background technique [0002] With the continuous deepening of seismic exploration work, the difficulty of the exploration targets that need to be solved is also getting higher and higher. In some exploration areas where fractured-vuggy carbonate reservoirs are the main geological targets, higher requirements are put forward for the ability to describe geological targets such as karst caves. It usually requires people to accurately characterize it through high-precision seismic exploration, diffraction wave imaging, etc., in order to finely explain details such as "beaded reflection", and then study its oil and gas. [0003] At present, both home and abroad are in the research stage of diffraction wave signal enhancement and imaging t...

Claims

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Application Information

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IPC IPC(8): G01V1/36
Inventor 邬达理袁联生赵群关达居兴国朱蓓蓓
Owner CHINA PETROLEUM & CHEM CORP
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