Fidelity imaging method based on wave field extrapolation of scalar wave
An imaging method and wave field technology, applied in the field of seismic exploration data processing, can solve the problems of FWI+LS_RTM not achieving the application effect and the data requirements do not match, and achieve the elimination of low wavenumber noise, accurate imaging results, and accurate imaging results. Effect
An imaging method and wave field technology, applied in the field of seismic exploration data processing, can solve the problems of FWI+LS_RTM not achieving the application effect and the data requirements do not match, and achieve the elimination of low wavenumber noise, accurate imaging results, and accurate imaging results. Effect
CN108919352AActive Publication Date: 2018-11-30CHINA NAT OFFSHORE OIL CORP +1
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[0015] The present invention will be described in detail below in conjunction with the accompanying drawings. However, it should be understood that the accompanying drawings are provided only for better understanding of the present invention, and they should not be construed as limiting the present invention.
[0016] Such as figure 1 As shown, the fidelity imaging method based on scalar wave field extrapolation provided by the present invention includes the following contents:
[0017] 1. Assuming that the underground medium is isotropic, uniform, and constant density, according to Newton's second law and Hooke's law, the scalar wave equation describing the propagation law of the seismic wave field excited by the source in the underground medium is obtained:
[0018]
[0019] Among them, V is the propagation velocity of seismic wave in the ground, u(x,t) is the wave field at the underground position x at a certain time t, f(t) is the source function,▽ 2 is the Laplace op...
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The invention relates to a fidelity imaging method based on wave field extrapolation of scalar wave. The method comprises the following steps: deriving a scalar wave equation describing the propagation law of a seismic wave field excited by an earthquake source in an underground medium according to the Newton's second law and the Hooke's law by assuming the underground medium as isotropy, uniformness and constant density; solving the scalar wave equation by using a finite difference method after knowing the underground smooth background speed and a seismic source sub-wave function, thereby obtaining the wave field amplitudes of the wave field at underground different space points at any time, and recording the wave field amplitude at a boundary when the wave field is propagated to the boundary of the numerical simulation; solving the scalar wave equation by regarding wave field amplitude at the boundary as a boundary value condition, thereby recovering the seismic source point end wavefield; solving the scalar wave equation by regarding the wave field received by a surface wave detector as the boundary value condition, thereby constructing a wave detection point end wave field; and performing the fidelity imaging on the seismic source point end wave field and the wave detection point end wave field through the fidelity imaging formula based on the wave field extrapolation of the scalar wave, thereby obtaining a fidelity imaging result of an underground reflection coefficient.
Description
technical field [0001] The invention relates to a fidelity imaging method based on scalar wave field extrapolation, and relates to the technical field of seismic exploration data processing. Background technique [0002] Seismic wave imaging has now developed to the stage where the FWI (Full Waveform Inversion) + LS_RTM (LeastSquare Reverse Time Migration) method is the core; among them, FWI mainly uses the transmitted wave information to estimate the background velocity; LS_RTM is an imaging method based on the idea of inverse scattering , trying to estimate wave impedance perturbations or velocity perturbations at high wavenumbers. The FWI method essentially includes the LS_RTM method, which is theoretically a nonlinear inversion method that can estimate all components from background parameter changes to high wavenumber parameter changes. LS_RTM is a linearized inversion under the assumption that the background parameters are correct and known, and can be considered as...
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Patent Timeline
30 Nov 2018
Publication
CN108919352A
- IPC
- G01V1/30
- CPC
- G01V1/30; G01V2210/60
- Inventors
- 张金淼; 周阳