Method and device for eliminating multiple waves based on frequency division principal component analysis
A principal component analysis, multiple wave technology, applied in the field of geophysics, can solve the problem that the effective wave cannot be guaranteed not to be damaged.
Active Publication Date: 2018-06-22
TSINGHUA UNIV
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[0003] The predicted multiples in the prediction subtraction method have a certain phase amplitude difference with the real multiples. Therefore, although the prediction subtraction method can eliminate the multiples in the original data according to the predicted multiples, it cannot guarantee effective wave undamaged
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[0026] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.
[0027] In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or e...
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The invention discloses a multiple elimination method and apparatus based on a frequency division major component analysis. The method comprises the following steps: performing frequency division processing on multiples obtained through prediction to obtain multiple multiple frequency ranges; respectively extracting multiple features from each multiple frequency range; synthesizing the multiple features extracted from the multiple multiple frequency ranges; according to a synthesis result, reconstructing real multiples in actual data; and subtracting the real multiples from the actual data to obtain complete primary waves of the actual data. According to the invention, different base vectors are learned by use of the predicted multiples with different frequencies, remarkable features of each frequency of the multiples can be effectively extracted, and in a multiple subtraction process, the multiples can be subtracted as many as possible without damaging the primary waves.
Description
technical field [0001] The invention relates to the technical field of geophysics, in particular to a method and device for eliminating multiple waves based on frequency division principal component analysis. Background technique [0002] Seismic imaging often contains multiple waves, which greatly affects the interpretation of seismic data. Effectively removing multiple waves in seismic data can greatly improve the reliability of seismic data, which is of great significance to seismic exploration. At present, there are mainly two methods for multiple wave suppression, one is the filtering method, and the other is the prediction and subtraction method. The prediction subtraction method uses the wave equation to simulate the actual wavelength or inverts the seismic data to predict the multiples in the seismic data, and then subtracts the predicted multiples adaptively to obtain the final data after removing the multiples. Due to the remarkable effect of the prediction subtr...
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IPC IPC(8): G01V1/36G01V1/30
Inventor 陆文凯刘金林
Owner TSINGHUA UNIV