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9th Biennial International Conference and Exposition on Petroleum Geophysics on 16-18 February, 2012

3D Converted Wave Data Processing A case history

Published in GEOHORIZONS - 2012

N. B. R. Prasad, ONGC

Abstract


In recent years, there has been a growing interest in shear- wave exploration for hydrocarbons as it facilitates to extract additional information such as Vp/Vs and other rock characteristics that include lithology, porosity, porefluid etc., In view of the benefits of shear wave data, an attempt is made to assess the utility of converted wave data by processing of converted wave data that was recorded along with vertical component by using 3C receivers. Also, an endeavor is made to understand the intricacies involved in converted wave data processing while paying more attention to some key issues such as rotation of data from (X,Y,Z) domain to (R,T,V) domain, estimation of Shear wave statics, binning and correction to compensate anisotropy. In the present case, anisotropy analysis could not be attempted as the input data contains narrow azimuth distribution. During the processing, PS data was compared to the equivalent PP data and observed that the PS data is corroborating with PP data in revealing the structural aspects of the subsurface. Also, it is observed that the Poisson

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