A method for determining the take-off time of high-resolution tow-and-drop shallow profile multiples

Abstract

The present invention proposes a method for determining the take-off time of high-resolution drag-and-drop shallow-profile multiples, including: introducing system delays to determine the expression of multiples take-off times; setting the range of system delays, and comparing the results obtained according to different system delays Whether the multiple waves match the actual seismic data, by reducing the system delay range and refining the system delay time interval, until the multiple waves are determined to match, and then determine the target system delay, and realize batch processing of the remaining survey lines. This scheme obtains the analytical solution of the multiple wave take-off time by setting different system delay times, and determines the accurate system delay time by verifying whether the multiple wave reflection time matches. This method has strong operability and high efficiency, and can realize industrialization Process-based production avoids the time-consuming and labor-intensive manual picking and the inaccuracy of traditional multiple take-off time prediction, and has higher practical application value.

Description

technical field [0001] The invention relates to the field of seismic exploration data processing, in particular to a method for determining the take-off time of high-resolution drag-and-drop shallow profile multiple waves. Background technique [0002] The removal of multiples is the difficulty and focus of high-resolution shallow seismic data processing at present. At present, multiples are generally predicted according to the periodicity of multiples, and then removed by adaptive subtraction. Therefore, multiple The most basic and important work in wave removal is how to accurately predict the take-off time of multiple waves. [0003] The current multiple wave prediction generally simply uses 2 times the bottom time for prediction, or uses the manual picking method to pick up multiple waves. Multiple wave prediction with twice the seabed time often has inaccurate predictions. When processing a large amount of shallow profile data, repeated quality control is often require...

AI Technical Summary

Problems solved by technology

Multiple wave prediction with twice the seabed time often has inaccurate predictions. When processing a large amount of shallow profile data, repeated quality control is often required. For multiple wave times with large deviations, manual operations are required. Correction, this method is a semi-automatic method; manual picking can generally obtain better results, but the efficiency is too low, especially when picking up large quantities of shallow section data, the cost is often too high, for example, the current shallow section survey is about 2.5 meters per shot, There are about 800,000 points in the 2000km shallow profile data, and it takes nearly a week to complete it by manual picking, which is difficult to apply in large quantities in actual production. In addition, when the multiple waves are relatively weak, it is very difficult to pick them up solely by naked eye recognition

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