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• W2178185367 abstract "We have developed a method of nonstationary sparse reflectivity inversion (NSRI) that directly retrieves the reflectivity series from nonstationary seismic data without the intrinsic instability associated with inverse [Formula: see text] filtering methods. We have investigated the NSRI performance in the presence of input error (e.g., the phase shift and the peak frequency of the wavelet), which determined that NSRI results are reasonable in the case of moderate error. NSRI was then applied to data collected from a laboratory physical model made of highly attenuating media, for which true reflectivities were known, but the wave propagation and the [Formula: see text] filtering mechanism were not. Analysis of data from the physical model, therefore, represented a blind test for evaluating the effectiveness and accuracy of NSRI. The physical model had a specified spatial scale of 1:5000 (relative to the field scale) and an approximate 1:1 velocity scale. Because the [Formula: see text] input is required by NSRI, attenuation of the P-wave was measured in the laboratory at ultrasonic frequencies with a pulse transmission technique and the spectral ratio method. Although multiples, side reflections from the model boundaries, diffractions, and other event types were clearly observed from the raw data, no preprocessing was done to avoid affecting the [Formula: see text] filtering effects. Results from the physical modeling data demonstrated that the derived formula for an attenuated seismogram was correct and estimated [Formula: see text] values were reliable. The functions and advantages of NSRI were confirmed. The [Formula: see text] compensated seismogram generated by NSRI was superior to that generated using gain-limited inverse [Formula: see text] filtering. We have also investigated NSRI’s capabilities in analyzing a marine data set from the Gulf of Suez. These examples provided a basis for discussing assumptions and limitations of NSRI." @default.
• W2178185367 created "2016-06-24" @default.
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• W2178185367 date "2016-01-01" @default.
• W2178185367 modified "2023-09-25" @default.
• W2178185367 title "Reflectivity inversion for attenuated seismic data: Physical modeling and field data experiments" @default.
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• W2178185367 doi "https://doi.org/10.1190/geo2015-0250.1" @default.
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