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Surface wave purification method and device based on in-phase axis morphological differences

A purification method and event technology, which is applied in the field of surface wave purification, can solve the problems of poor separation of wave fields, insufficient sparse representation coefficients of surface waves and interference waves, etc., and achieve the effect of reducing the interference of dispersive energy spectrum

Active Publication Date: 2019-03-15
INST OF GEOCHEM CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

The existing surface wave purification method is simply based on some mathematical transformations to separate the wave field in the transform domain, but because the representation coefficients of the surface wave and interference wave in the transform domain are not sparse enough, there are problems such as poor wave field separation effect

Method used

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  • Surface wave purification method and device based on in-phase axis morphological differences
  • Surface wave purification method and device based on in-phase axis morphological differences
  • Surface wave purification method and device based on in-phase axis morphological differences

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no. 1 example

[0063] see figure 2 , the present embodiment provides a surface wave purification method based on event shape difference, the method includes step S01 to step S50.

[0064] Step S01: Acquire raw seismic data.

[0065] The original seismic data y is obtained. In this embodiment, the original seismic data y refers to the recorded single-shot seismic data y. Generally, the single-shot seismic data y includes reflected wave data and surface wave data.

[0066] Step S10: For seismic reflection wave data y r to initialize.

[0067] The pair of seismic reflection data y r To initialize, that is to reflect the wave data y r Give the initial value, in this embodiment, let the reflected wave data y r =0.

[0068] Before the step S20, the method further includes a step S101.

[0069] Step S101: Let the loop variable k=k+1.

[0070] Since multiple iterative loop calculations are required, in this embodiment, a loop variable k is set, the number of iterations K is given, the init...

no. 2 example

[0108] This embodiment provides a surface wave purification device 200 based on event morphological differences, the surface wave purification device 200 based on event morphological differences is used to perform the surface wave purification based on event morphological differences provided in the first embodiment method.

[0109] It should be noted that the basic principles and technical effects of the surface wave purification device 200 based on the difference in event shape provided by this embodiment are basically the same as those of the surface wave purification method based on the difference in event shape provided in the first embodiment. Description, this embodiment will not be described in detail, and this embodiment does not introduce details, please refer to the relevant content in the first embodiment.

[0110] see Figure 5 , Figure 5 A schematic diagram of the functional units of the surface wave purification device 200 based on the event shape difference ...

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Abstract

The invention provides a surface wave purification method and device based on in-phase axis morphological differences, and relates to the technical field of seismic data processing. The method comprises the steps that reflected wave data yr is initialized; according to original seismic data y and the reflected wave data yr, a sparse representation coefficient of surface waves in a frequency domainhigh-resolution LRT conversion region is obtained, and surface wave data yg is reconstructed; according to the original seismic data and the reconstructed surface wave data yg, the sparse representation coefficient of reflected waves in the time-domain high-resolution HRT conversion region is reflected, and the reflected wave data yr is reconstructed; the reconstruction computation step is performed iteratively so as to solve the sparse optimization problem under an MCA frame, and the surface wave purification result is obtained. By performing repeated conversion and reconstruction on the surface waves and the reflected waves, when the frequencies and the apparent velocities of the surface waves and the reflected waves are close, the surface waves can still be effectively extracted, interference of the reflected waves for the surface wave frequency dispersion energy spectrum is lowered, and high-precision surface wave data is provided for frequency dispersion analysis.

Description

technical field [0001] The invention relates to the technical field of seismic data processing, in particular to a surface wave purification method and device based on event shape differences. Background technique [0002] Surface wave detection has the characteristics of small attenuation, high signal-to-noise ratio, and non-destructive detection. Its dispersion characteristics reflect the change of shallow shear wave velocity structure. It is widely used in the detection of surface geological structures and engineering detection. In order to accurately extract the surface wave dispersion curve, it is necessary to separate the wave field with the help of signal processing methods according to the characteristic difference between the surface wave and the interference wave. Different from the method of suppressing the surface wave in the reflection wave exploration, it is required that the surface wave cannot be affected before and after the surface wave exploration. wave di...

Claims

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Application Information

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IPC IPC(8): G01V1/32G01V1/36
CPCG01V1/325G01V1/362
Inventor 汪超邱新明王赟
Owner INST OF GEOCHEM CHINESE ACADEMY OF SCI