A Variable Depth Cable Ghost Suppression Method Based on Boundary Value Inversion of Wave Equation

Abstract

The invention relates to a variable-depth cable ghost wave suppression method based on wave equation boundary value inversion. The method includes the following steps: 1) extracting a common-shot-point gather from seismic data collected by a variable-depth cable; 2) performing one-dimensional Fourier transform on the seismic data of a certain shot of the common-shot-point gather to obtain a frequency spectrum containing ghost wave seismic data; 3) calculating frequency domain seismic data U<AB> containing ghost waves corresponding to a certain frequency omega in the frequency spectrum; 4) calculating G1 and G2 according to detection point depth H<0><(2)>; 5) calculating frequency domain seismic data F<CD> after ghost wave suppression which are corresponding to the frequency omega according to U<AB>, G1 and G2; 6) performing steps 3) to 5) on all frequencies omega on the frequency spectrum in the common-shot-point gather to obtain frequency domain seismic data after ghost wave suppression; 7) performing steps 2) to 6) on other shots in the common-shot-point gather to obtain frequency domain seismic data after ghost wave suppression; and 8) performing inverse Fourier transform on frequency domain seismic data F<CD> after ghost wave suppression to obtain a common-shot-point gather after ghost wave suppression. The variable-depth cable ghost wave suppression method based on wave equation boundary value inversion can be used in the processing process of seismic data collected by a maritime variable-depth cable.

Description

technical field [0001] The invention relates to an exploration method for energy development, in particular to a method for suppressing variable-depth cable ghost waves based on wave equation boundary value inversion. Background technique [0002] Seismic exploration is an important means of oil and gas exploration, especially offshore oil and gas exploration. Because of its high drilling cost and few other data such as well logging and geology, seismic exploration plays a more important role in offshore oil and gas exploration. Broadband seismic data can be interpreted as basic data that can improve resolution and signal-to-noise ratio in middle and deep layers, and improve the accuracy and reliability of structural interpretation and reservoir prediction, which is one of the goals pursued by offshore seismic exploration. However, due to various constraints, this goal has not been well realized. In marine seismic exploration, it is generally necessary to place the seismic ...

AI Technical Summary

Problems solved by technology

With the development of oil and gas exploration, the main oil and gas formations to be explored are becoming more and more complex. For such complex underground media, the accuracy of the above method for suppressing ghost waves is reduced, and it is difficult to completely suppress ghost waves.

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