Sound wave reverse time migration method based on Higdon third-order boundary condition

A technology of reverse time migration and boundary conditions, applied in the field of seismic exploration migration imaging, which can solve the problems of multi-noise in the central wave field, reduced wave field calculation efficiency, and large amount of calculation.

Inactive Publication Date: 2016-01-13
OCEAN UNIV OF CHINA
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Problems solved by technology

Commonly used wave field storage strategies are boundary storage technology based on PML and boundary storage technology based on random boundary conditions, but both methods have shortcomings
The boundary storage technology based on PML, due to the large amount of calculation of the PML boun

Method used

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  • Sound wave reverse time migration method based on Higdon third-order boundary condition
  • Sound wave reverse time migration method based on Higdon third-order boundary condition
  • Sound wave reverse time migration method based on Higdon third-order boundary condition

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Embodiment 1

[0038] A method of acoustic wave reverse time migration based on Higdon's third-order boundary condition, the medium model of the specific embodiment includes such as figure 1 A simple model of a two-layer homogeneous medium is shown and as Figure 7 Marmousi model shown. When using the acoustic wave equation to realize finite-difference reverse-time migration with 2N (N=10)-order precision in time and space, the range of the central wave field area is determined according to the information of the observation system, and a network with a thickness of N layers is used outside the central wave field. The Higdon third-order absorbing boundary condition of the grid point, the wave field structure with the Higdon third-order boundary condition is as follows figure 2 As shown, wave field continuation can be carried out based on this wave field structure. The specific process is as follows:

[0039] (1) In the continuation stage of the positive time wave field of the reverse tim...

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Abstract

The invention relates to a sound wave reverse time migration method based on a Higdon third-order boundary condition, and belongs to the field of seismic exploration migration imaging. The sound wave reverse time migration method has the specific steps of: step 1, carrying out continuation of a correct time wave field by taking seismic wavelets as correct time disturbance, saving central wave field values at the last two moments, and calculating and saving a wave field value in a boundary region based on the Higdon third-order boundary condition; step 2, carrying out continuation of a reverse time wave field by taking seismic records as reverse time disturbance, and reconstructing a central wave field value of the correct time wave field by utilizing the saved central wave field values and the wave field value of the boundary region; step 3, and multiplying a correct time wave field value and a reverse time wave field value at each point, regarding the result as an imaging value of the point, and adding the imaging values of all moments to obtain a final imaging value of the point. The sound wave reverse time migration method eliminates boundary reflection by utilizing the Higdon third-order boundary condition, achieves the reconstruction of the correct time wave field based on boundary storage of the boundary condition, can effectively reduce memory consumption of conventional reverse time migration, and has higher imaging precision.

Description

technical field [0001] The invention belongs to the field of seismic exploration migration imaging, in particular to an acoustic wave reverse time migration method based on Higdon's third-order boundary condition. Background technique [0002] The basic idea of ​​reverse time migration is to calculate the time extension of the forward wave field and the reverse time wave field through the numerical simulation of the wave equation, and perform imaging at the corresponding time. Because it is based on the two-way wave equation and is not limited by the dip angle, it is considered to be one of the best migration methods for imaging complex structures in current seismic exploration. Conventional acoustic reverse time migration mainly includes the following three steps: [0003] (1) Timing wavefield continuation, starting from the zero moment, using the acoustic wave equation finite difference numerical simulation method to simulate the seismic wave propagation process generated...

Claims

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Application Information

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IPC IPC(8): G01V1/28
Inventor 张晓波钟梦轩谭昊宋鹏谭军李金山夏冬明姜秀萍赵波李沅衡
Owner OCEAN UNIV OF CHINA
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