Local tomographic velocity modeling of deep anhydrite-bearing rocks

QI Peng

doi:10.11720/wtyht.2022.1512

2022 Vol. 46, No. 4

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QI Peng. 2022. Local tomographic velocity modeling of deep anhydrite-bearing rocks. Geophysical and Geochemical Exploration, 46(4): 982-987. doi: 10.11720/wtyht.2022.1512

Citation:

QI Peng. 2022. Local tomographic velocity modeling of deep anhydrite-bearing rocks. Geophysical and Geochemical Exploration, 46(4): 982-987. doi: 10.11720/wtyht.2022.1512

Local tomographic velocity modeling of deep anhydrite-bearing rocks

QI Peng

Sinopec Geophysical Research Institute,Nanjing 211103,China

Received Date: 15 September 2021

Revised Date: 20 August 2022

Publish Date: 17 August 2022

Abstract

Abstract

The deep parts of complex prospecting areas such as piedmont zones and ultra-deep strata are usually accompanied by anhydrite-bearing rocks,leading to great challenges to velocity modeling and affecting the final imaging quality and reliability.It is difficult for the conventional grid tomography method to adapt to the severe lateral velocity changes of special geological bodies.To this end,this study introduced a local tomographic velocity modeling method for deep anhydrite-bearing rocks.By constructing a new tomographic objective function for velocity anomalies,the local remaining residuals below the rocks were converted into the velocity update amount of the special lithologic bodies through tomography in order to further improve the accuracy of the velocity model and effectively improve the quality of imaging below the rocks.The actual data processing results have verified the effectiveness of the local tomography method,which will provide effective technical support for oil and gas prospecting in complex prospecting areas.
- local tomography /
- velocity modeling /
- gypsum-salt /
- special lithological body

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References

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