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Post-stack seismic inversion and attribute analysis in shallow offshore of Krishna-Godavari basin, India

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Journal of the Geological Society of India

Abstract

Seismic attributes such as: amplitude envelope, instantaneous phase and cosine of instantaneous phase of 2D post-stack seismic data facilitates structural and stratigraphic interpretation of shallow marine offshore, Krishna-Godavari basin. Two seismic sections namely, X and Y oriented N-S passing through wells W-1 andW-2 respectively are considered for seismic attribute analysis and porosity prediction. The gamma ray log trend indicates deposition of cleaning upward sediment. Coarsening upward, clayey-silty-sandy bodies, making a series of about 50-60 m thickness, have been evidenced from the gamma ray log. An extensional structural style comprising growth faults is associated with the progradational style of deposition. Four seismic zones have been distinguished. These zones differ in amplitude, frequency and continuity of the reflectors. Channel sands of Cretaceous age of Raghavapuram shale are identified in well log, seismic section and its acoustic impedance section. Major stratigraphic horizons along with faults extending to basement are marked with the help of attribute analysis. Porosity is mapped from transformation of acoustic impedance. The shales/unconsolidated sediments measure a high porosity with low impedance and the more porous sands are in an intermediate range. The predicted impedance and porosity values may be erroneous beyond the drilled depth because of non availability of well log data for calibration.

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Authors and Affiliations

  1. Dept. of Applied Geophysics, Indian School of Mines, Dhanbad, 826 004, India

    Baisakhi Das, Rima Chatterjee & Rajan Kumar

  2. Banaras Hindu University, Varanasi, 221 005, India

    Dip Kumar Singha

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  1. Baisakhi Das
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  2. Rima Chatterjee
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  3. Dip Kumar Singha
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  4. Rajan Kumar
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Correspondence to Rima Chatterjee.

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Das, B., Chatterjee, R., Singha, D.K. et al. Post-stack seismic inversion and attribute analysis in shallow offshore of Krishna-Godavari basin, India. J Geol Soc India 90, 32–40 (2017). https://doi.org/10.1007/s12594-017-0661-4

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