Method for fast predicting 3D surface-related multiples
A prediction method and multiple wave technology, applied in the direction of seismic signal processing, etc., can solve problems such as large amount of calculation and ineffective adaptation
Active Publication Date: 2016-01-20
CHINA UNIV OF PETROLEUM (EAST CHINA)
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2DSRME cannot effectively adapt to the situation where the subsurface medium has an inclination angle in the direction of the transverse line or the streamer acquisition has feather angle drift (Dragoset, B., E. Verschuur, I. Moore and R. Bisley, 2010, Aperspective on 3D surface-related multiple elimination: Geophysics, 75, 75A245-75A261.)
When the iterative reweighted least squares algorithm predicts the multiple waves in each channel, it needs to perform a matrix-matrix multiplication and matrix inversion operation for each frequency value in each iteration, which requires a large amount of calculation.
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[0064] The basic idea of the present invention is: characterize the event vertex estimation problem of the cross-survey line MCG as a mixed frequency-time domain parabola sparse inversion problem, construct a corresponding mathematical model, perform Radon positive and negative transformation in the frequency domain, and construct a method for each A curvature parameter, an optimization problem that imposes sparse constraints along the time and space directions of event vertices, and introduces a fast iterative shrinkage threshold algorithm to reduce the computational complexity of solving the optimization problem.
[0065] Specifically, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments:
[0066] combine figure 1 As shown, the fast 3D free surface multiple wave prediction method includes the following steps:
[0067] a extrapolate the missing near-offset distance of the 3D seismic data, and...
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The invention belongs to seismic signal processing field in seismic prospecting technology and specifically discloses a method for fast predicting 3D surface-related multiples. The method estimates the seismic event apex position of a cross-line MCG by using hybrid frequency-time domain parabolic sparse inversion in order to achieve 3D surface-related multiple predictions. For each curvature parameter, the method may apply sparse constraint along the time and space direction of a seismic event apex. In the known cross-line MCGs with the same position, the hybrid frequency-time domain parabolic sparse inversion method based on a fast iteration shrinkage threshold algorithm just computes matrix inversion for one time for each frequency value. Compared with a conventional method for predicting 3D surface-related multiples based on frequency-domain parabolic sparse inversion, the method may further improve multiple prediction precision while reducing computing amount.
Description
technical field [0001] The invention belongs to the field of seismic signal processing in seismic exploration technology, in particular to a fast 3D free surface multiple wave prediction method based on mixed frequency-time domain parabola sparse inversion. Background technique [0002] SRME (SurfaceRelatedMultipleElimination) is widely used to suppress free surface multiple waves in marine seismic exploration. 2DSRME cannot effectively adapt to the situation where the subsurface medium has an inclination angle in the direction of the transverse line or the streamer acquisition has feather angle drift (Dragoset, B., E. Verschuur, I. Moore and R. Bisley, 2010, Aperspective on 3D surface-related multiple elimination: Geophysics, 75, 75A245-75A261.). Considering the 3D propagation characteristics of the seismic wavefield, 3DSRME can predict the travel time of free surface multiples better than 2DSRME. However, the direct application of 3DSRME requires a sufficiently large sam...
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Inventor 李钟晓李振春
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)