3D seismic slope tomography based on depth weighting

TIAN Kun; WANG Chang-Bo; LIU Li-Bin; ZHANG Jian-Zhong

doi:10.11720/wtyht.2022.1586

2022 Vol. 46, No. 6

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TIAN Kun, WANG Chang-Bo, LIU Li-Bin, ZHANG Jian-Zhong. 2022. 3D seismic slope tomography based on depth weighting. Geophysical and Geochemical Exploration, 46(6): 1485-1491. doi: 10.11720/wtyht.2022.1586

Citation:

TIAN Kun, WANG Chang-Bo, LIU Li-Bin, ZHANG Jian-Zhong. 2022. 3D seismic slope tomography based on depth weighting. Geophysical and Geochemical Exploration, 46(6): 1485-1491. doi: 10.11720/wtyht.2022.1586

3D seismic slope tomography based on depth weighting

1. Geophysical Research Institute,Shengli Oilfield Branch Company of Sinopec,Dongying 257022,China；
2. College of Marine Geosciences,Ocean University of China,Qingdao 266000,China

Received Date: 01 November 2021

Revised Date: 20 December 2022

Publish Date: 03 January 2023

Abstract

Abstract

The seismic slope tomography is an effective method for building macro-velocity models using the travel time and slopes of locally coherent events of reflected waves.For data with low signal-to-noise ratios,the deep effective reflection wave data that can be picked are often far fewer than the shallow reflection wave data,resulting in a poor tomographic inversion effect of the velocity of the deep strata.Therefore,this study proposed a 3D seismic slope tomography method based on depth weighting.In the linear tomographic inversion equation of each iteration,the depth weighting was performed for the kernel function of the observed data on the node velocity of the discrete model.The weighting coefficient was determined according to the node depth of the discrete model and the reflection point depth of each shot-detection pair of the current iteration,increasing the constraining effect of deep reflection wave data on the deep velocity.Meanwhile,the shallow velocity was mainly constrained by the shallow reflection wave data.As a result,the inversion effect of deep velocity could be improved while maintaining the inversion precision of shallow velocity.The application and tests of both theoretical model data and actual data yielded satisfactory results,verifying the effectiveness of the method.
- velocity model /
- seismic reflection wave /
- slope tomography /
- depth weighting

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References

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