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Seismic slope tomography method based on depth weighting

A tomographic imaging and slope technology, applied in seismology, seismic signal processing, geophysical measurement, etc., can solve the problems of inability to establish accurate deep velocity field, low signal-to-noise ratio, and poor inversion velocity effect, and improve the speed Model quality, the effect of improving the modeling effect

Active Publication Date: 2022-05-20
OCEAN UNIV OF CHINA
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Problems solved by technology

[0003] For the actual seismic data, on the one hand, due to the spherical diffusion of seismic waves and the absorption and attenuation of the medium, the energy of seismic waves from deep formations is weak; on the other hand, the information of deep seismic data from areas with complex and diverse geological structures and large velocity changes The noise ratio is often relatively low, such as the concealed buried hill under the control of multiple stages of Mesozoic-Paleozoic tectonic movements, and the event axis inside the buried hill is not clear and very messy
Therefore, the travel time and slope data of deep effective reflected waves that can be picked up are often less, resulting in insufficient ray coverage in deep formations and poor inversion speed effect
For seismic data with less effective deep reflection data, the current slope tomography method cannot establish an accurate deep velocity field, especially when the difference between the initial velocity and the real velocity is large, the accuracy of the established depth velocity field is very low, and cannot meet the velocity requirements. mold requirements

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  • Seismic slope tomography method based on depth weighting
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  • Seismic slope tomography method based on depth weighting

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Embodiment 1

[0044] In the following, the theoretical model test of the present invention will be explained and described in conjunction with specific implementation methods.

[0045] In order to further illustrate the realization idea and implementation process of this method and prove the effectiveness of the method, a theoretical model is used to test and compare with the results of the non-depth-weighted seismic slope tomography method.

[0046] S1: Use the theoretical speed model as the real speed model. The true velocity model has a lateral width of 14km and a depth of 4km. A square unit grid is used for discretization, the grid size is 50m, see figure 2 , for the convenience of comparison, the theoretical velocity model is smoothed, see image 3 .

[0047] S2: Observation system: evenly distribute the scattering points on each velocity interface, from each scattering point to The directions of 10°, 20°, 30° and 35° are emitted towards the surface, and the ray is traced to the ...

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Abstract

The invention relates to a depth-weighted seismic slope tomographic imaging method, which belongs to the technical field of velocity modeling for seismic data processing. It solves the problem of poor deep velocity modeling effect due to weak deep reflection events and few effective signals in complex structural areas, and improves the inversion accuracy of deep formation velocity while ensuring the accuracy of shallow velocity. The invention includes the following steps: preprocessing the seismic data; picking up the travel time and slope of the reflected wave to form observation data; establishing an initial velocity model and initial ray segment parameters to form a model space; joint inversion of ray segment parameters and velocity models; Quality control is performed on the inversion results. If the inversion results do not converge, the inversion iterations are continued. If the inversion results are converged, the velocity model and ray segment parameters are output.

Description

technical field [0001] The invention relates to a depth-weighted seismic slope tomographic imaging method, which belongs to the technical field of velocity modeling for seismic data processing. Background technique [0002] Seismic slope tomography was proposed by Frédéric Billette in 1998. This method combines the travel time of reflected waves and the slope information of local coherent events to establish a subsurface velocity model and estimate the position of reflection points. Compared with reflection wave traveltime tomography, slope tomography introduces slope information to constrain the ray propagation path, which helps to reduce inversion ambiguity; at the same time, this method does not need to establish a one-to-one correspondence between continuous reflection events and subsurface interfaces relationship, only the traveltime and slope of the local coherent event need to be picked up, which is more suitable for low signal-to-noise ratio data processing in comple...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/282G01V1/30Y02A90/30
Inventor 张倩锋张建中杨华臣
Owner OCEAN UNIV OF CHINA
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