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• W4379796966 abstract "The marine controlled-source electromagnetic technique is employed both in large-scale geophysical applications as well as within the exploration of hydrocarbons and gas hydrates. Because of the diffusive character of the EM field, only very low frequencies are used, leading to inversion results with low resolution. In this paper, we calculated the resolution matrix associated with the inversion and derived the corresponding point-spread functions. The PSFs provided information about how much the actual inversion was blurred. Using a space-varying deconvolution can thus further improve the inversion result. The actual deblurring was carried out using the nonnegative flexible conjugate gradient least-squares (NN-FCGLS) algorithm, which is a fast iterative restoration technique. To attain completeness, we also introduced the results obtained using a blind deconvolution algorithm based on the maximum likelihood estimation with unknown PSFs. The potential of the proposed approach has been demonstrated using both complex synthetic data and field data acquired at the Wisting oil field in the Barents Sea. In both cases, the resolution of the final inversion result was improved and showed greater agreement with the known target area." @default.
• W4379796966 created "2023-06-09" @default.
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• W4379796966 date "2023-06-07" @default.
• W4379796966 modified "2023-10-14" @default.
• W4379796966 title "Resolution enhancement of 2D controlled-source electromagnetic images by use of point-spread function inversion" @default.
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• W4379796966 doi "https://doi.org/10.3389/feart.2023.1101228" @default.
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