Method for eliminating deep water interlamination multiple
A multiple wave and water layer technology, applied in the field of oil and gas exploration, can solve problems such as application, difficult seismic data processing, and large amount of calculation
Active Publication Date: 2015-01-14
CHINA NAT OFFSHORE OIL CORP +1
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However, the calculation amount of this algorithm is very large, and it is difficult to be applied in the actual seismic data processing at present.
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[0127] The essence of the above description is the process of accurately predicting the interlayer multiples. After the interlayer multiples are predicted, they need to be further eliminated. Therefore, as a complete implementation of eliminating interlayer multiple waves, it should specifically include the following steps:
[0128] 1. Use conventional methods to decompile, denoise, and eliminate free surface multiples of the original seismic data;
[0129] 2. Use conventional methods to establish the observation system, and extract the gathers from the original data to obtain the common midpoint (CMP) gather;
[0130] 3. Collect the CMP data obtained by sampling Perform two-dimensional Fourier transform to obtain frequency-wavenumber domain data D ‾ ( k s , k g ; ω ) , ...
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The invention relates to a method for eliminating deep water interlamination multiple. The method is applied to oil-gas exploration seismic data processing and comprises the following steps of: 1, eliminating multiple on a free surface; 2, sorting original data; 3, performing two-dimensional Fourier transformation on the sorted data (xs and xg; t) so as to acquire frequency-wavenumber domain data (ks and kg; w); 4, deducting n-order scattered wave field Dn by using a back scattering stage number and the frequency-wavenumber domain data D (ks and kg; w); 5, obtaining a wave field D0 in which the multiple associated with the free surface is eliminated according to Dn; 6, iteratively calculating Vn according to two restraining conditions of the interlamination multiple formed in the scattered wave field under the condition that the depth Zg of a downlink scattering point is less than the depths Zg, and Zg,, of two adjacent scattering points, and obtaining a stage number item of the relevant interlamination multiple; 7, performing reverse Fourier transformation on the back scattering stage number item and obtaining d1(xs and xg; t); and 8, subtracting d(xs and xg; t) and d1(xs and xg; t) in a data matching manner so as to obtain a corrugated metal pipe (CMP) sort subjected to interlamination multiple elimination. Based on a scattering theory of the quantum mechanics, a deep water interlamination multiple elimination technology is provided, so the blank of seismic data deep water interlamination multiple elimination is filled up.
Description
technical field [0001] The invention relates to the field of oil and gas exploration, in particular to a method for eliminating multiple waves between deep water layers in seismic acquisition of ocean oil and gas exploration. Background technique [0002] In the seismic acquisition of oil and gas exploration, the acquired seismic records contain reflection waves and multiple waves. The current seismic processing technology is based on the imaging theory of reflected waves. Multiple waves are regarded as noise and eliminated. Eliminating multiple waves without destroying effective waves is the difficulty of multiple wave elimination technology. Multiples can be divided into surface-related multiples and interlayer multiples. The multiple wave elimination technology in current oil and gas exploration seismic data processing theory can only eliminate surface-related multiples, but cannot eliminate interlayer multiples. waves, especially deep water interlayer multiples cannot b...
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IPC IPC(8): G01V1/36
Inventor 张金淼刘伊克陈宝书常旭汪小将
Owner CHINA NAT OFFSHORE OIL CORP