Marine Seismic Dithering Sequence for Deblending

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Solution Overview

Problem

Existing deblending algorithms in marine seismic data acquisition struggle to perfectly separate overlapping seismic waves due to clustering of random dithering times and insufficient clean record lengths, leading to suboptimal data processing.

Innovation Solution

A novel dithering sequence is generated with all odd or even members shot at zero dithering times and the rest with random dithering times, ensuring a minimum range greater than a preset value, to enhance the clean record length and improve deblending efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If random dithering times are applied to seismic sources for deblending, then overlapping seismic waves can be separated, but the random dithering times cluster leading to insufficient clean record lengths

Engineering Contradiction:

Improvedeblending qualityVSAvoidclean record length

Core Design Contradiction:

ReliabilityVSDuration of action of moving object

Solution Approach 1:

The patent changes the parameter distribution of dithering times from uniform random to a structured pattern where odd members are zero and even members are uniformly distributed. This parameter transformation eliminates clustering while maintaining deblending effectiveness, thereby extending the clean record length without sacrificing separation quality.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces a periodic structure to the dithering sequence by alternating between zero dithering (odd members) and uniform random dithering (even members). This periodic pattern ensures sufficient temporal separation between sources while maintaining the randomness needed for effective deblending, thus resolving the contradiction between separation quality and record length.

Inventive Principle:

Principle #19Periodic action

2Quantity of substance

If multiple seismic sources are used to increase crossline sampling, then data density improves, but temporal shot spacing decreases leading to more overlapping waves

Engineering Contradiction:

Improvecrossline sampling densityVSAvoidtemporal shot spacing

Core Design Contradiction:

Quantity of substanceVSLoss of time

Solution Approach 1:

The patent applies different dithering strategies to different sources based on their position in the shooting sequence. Odd members receive zero dithering while even members receive uniform random dithering. This localized differentiation allows multiple sources to operate simultaneously with improved temporal separation, maintaining high crossline sampling density while reducing overlap through targeted temporal modulation.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11009618B2System and method for generating dithering sequences with minimum value for seismic exploration

Publication Date: 2021.05.18 SERCEL SAS

AI summary

System and method for shooting plural seismic sources Si in a marine acquisition system with a deblending-designed dithering sequence DSnew. The method includes generating the deblending-designed dithering sequence DSnew to include random dithering times Di, a range of the dithering times Di being larger than a preset, non-zero, minimum value pmv; selecting a shooting sequence SS for the plural seismic sources Si; and shooting the plural seismic sources Si with the deblending-designed dithering sequence DSnew, based on the shooting sequence SS. All odd or all even members of the shooting sequence SS are shot with zero dithering times.