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• W2754295634 startingPage "726" @default.
• W2754295634 abstract "ABSTRACT Reverse‐time migration has become an industry standard for imaging in complex geological areas. We present an approach for increasing its imaging resolution by employing time‐shift gathers. The method consists of two steps: (i) migrating seismic data with the extended imaging condition to get time‐shift gathers and (ii) accumulating the information from time‐shift gathers after they are transformed to zero‐lag time‐shift by a post‐stack depth migration on a finer grid. The final image is generated on a grid, which is denser than that of the original image, thus improving the resolution of the migrated images. Our method is based on the observation that non‐zero‐lag time‐shift images recorded on the regular computing grid contain the information of zero‐lag time‐shift image on a denser grid, and such information can be continued to zero‐lag time‐shift and refocused at the correct locations on the denser grid. The extra computational cost of the proposed method amounts to the computational cost of zero‐offset migration and is almost negligible compared with the cost of pre‐stack shot‐record reverse‐time migration. Numerical tests on synthetic models demonstrate that the method can effectively improve reverse‐time migration resolution. It can also be regarded as an approach to improve the efficiency of reverse‐time migration by performing wavefield extrapolation on a coarse grid and by generating the final image on the desired fine grid." @default.
• W2754295634 created "2017-09-25" @default.
• W2754295634 creator A5005237932 @default.
• W2754295634 creator A5019188324 @default.
• W2754295634 creator A5019657497 @default.
• W2754295634 date "2018-03-09" @default.
• W2754295634 modified "2023-09-27" @default.
• W2754295634 title "Increasing resolution of reverse-time migration using time-shift gathers" @default.
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• W2754295634 doi "https://doi.org/10.1111/1365-2478.12574" @default.
• W2754295634 hasPublicationYear "2018" @default.
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