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| 3D seismic slope tomography based on depth weighting |
TIAN Kun1( ), WANG Chang-Bo1, LIU Li-Bin1, ZHANG Jian-Zhong2 |
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 |
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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.
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Received: 01 November 2021
Published: 03 January 2023
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Geometric relationship between model parameters and observation data
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Theoretical velocity model of buried hill
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Speed model slice with y=1 km
a—theoretical model;b—initial model;c—inversion model without depth weighting;d—inversion model with depth weighting
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Comparison between theoretical velocity and inversion velocity curves with depth
a—velocity curve with x=6 km;b—velocity curve with x=12 km
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Single shot seismic record after preprocessing
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Velocity model of slope tomography inversion
a—no depth weighting;b—with depth weighting
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figure 6AB line position)
a—no depth weighting;b—with depth weighting
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Slope tomography inversion velocity model slice along the measuring line y=9 km (figure 6AB line position)
a—no depth weighting;b—with depth weighting
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Prestack depth migration profiles using different velocity models
a—non depth weighted slope tomography of inversion model;b—depth weighted slope tomography inversion model
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