Interlayer multiple suppression method
A technology of interlayer multiple waves and wavelets, which is applied in the field of marine and land geophysical exploration, can solve the problems of "event fat" energy difference, the influence of interlayer multiple wave accuracy, and increase the accuracy, so as to improve the accuracy , Improving the imaging quality and improving the resolution effect
Active Publication Date: 2020-03-13
CHINA PETROLEUM & CHEM CORP +1
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[0006] The disadvantage of the existing inverse scattering series method is that since at least three wavelets are convoluted in the process of predicting interlayer multiples, the predicted interlayer multiple waveforms and amplitudes have changed greatly, and the event becomes "fat" and makes the energy difference larger, so the existence of wavelets has a great influence on the accuracy of interlayer multiple prediction
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[0044] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention. It should be noted that, as long as there is no conflict, each embodiment and each feature in each embodiment of the present invention can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.
[0045] In order to understand the present invention more clearly, the following first analyzes the existing physical mechanism of the inverse scattering series to predict interlayer multiple waves.
[0046] Scattering theory is a basic theory about the relationship between the scattering wavefield (the difference between the actual wavefield and the background wavefield) and the disturbed medium (the difference...
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The invention discloses an interlayer multiple suppression method. The method comprises the steps of performing wavelet removal on preprocessed seismic data, performing trace gathering on the seismicdata after wavelet removal to obtain full-wave field data, performing Fourier transform on the data to obtain frequency-wave number domain data, performing constant background speed offset on the datato obtain pseudo depth domain data, according to the pseudo depth domain data, performing interlayer multiple prediction by using an inverse scattering series method to obtain wavelet-removed interlayer multiple data, performing inverse Fourier transform on the data to obtain space-time domain data, carrying out wavelet compensation processing to acquire interlayer multiple data after wavelet compensation, and carrying out matching subtraction on the preprocessed seismic data and the interlayer multiple data after wavelet compensation to obtain seismic data after interlayer multiple suppression. The method can effectively improve the interlayer multiple prediction accuracy, thereby suppressing the interlayer multiples, improving the seismic data resolution, and improving the imaging quality.
Description
technical field [0001] The invention relates to the technical field of marine and terrestrial geophysical exploration, in particular to a method for suppressing interlayer multiple waves. Background technique [0002] In marine and land seismic exploration, due to the existence of strong reflection interfaces underground, seismic waves are reflected multiple times between strong reflection interfaces to form interlayer multiple waves, and interlayer multiple waves and primary waves are superimposed and interfere with each other, which seriously reduces the accuracy of seismic data. The resolution increases the difficulty of identifying effective waves, and affects the quality of seismic imaging and the authenticity and reliability of seismic interpretation. Therefore, attenuating or eliminating interlayer multiples is an important link in seismic data processing. [0003] In order to eliminate the interference of interlayer multiple waves and improve data resolution, the ge...
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Login to View More IPC IPC(8): G01V1/36
CPCG01V1/36
Inventor 杨金龙
Owner CHINA PETROLEUM & CHEM CORP