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| Local tomographic velocity modeling of deep anhydrite-bearing rocks |
QI Peng( ) |
| Sinopec Geophysical Research Institute,Nanjing 211103,China |
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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.
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Received: 15 September 2021
Published: 17 August 2022
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The imaging results with low-speed ointment body
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The results of local tomography velocity modeling in low-speed ointment body
a—the initial velocity model of ointment body;b—the conventional grid tomography inversion results;c—the local tomography inversion results
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Comparison of the velocity update with conventional grid tomography (a) and local tomography
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Comparison of the velocity model before and after local tomography
a—the velocity model and imaging stack before local tomography;b—the velocity update of local tomography;c—the velocity model and imaging stack after local tomography
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Comparison of the CIGs before (a) and after (b) local tomography inversion
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The RTM imaging result before (a) and after (b) local tomography inversion
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Comparison of horizontal slice in the low-speed ointment body
a—conventional grid tomography;b—local tomography
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The RTM imaging result from the conventional grid tomography (a) and the local tomography (b)
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