Seismic Attenuation for Characterization of Gas Hydrate Reservoir in Krishna-Godavari Basin, Eastern Indian Margin

Authors

  • Veligeti Jyothi
     CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad - 500 007
  • Kalachand Sain
     CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad - 500 007
  • Vivekanand Pandey
     CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad - 500 007
  • Ajoy K. Bhaumik
     Department of Applied Geology, IIT (ISM), Dhanbad - 826 004

DOI:

https://doi.org/10.1007/s12594-017-0713-9

Abstract

Gas hydrates have received global attention as a possible alternative non-conventional energy resource. Hence, the detection, characterization and quantification of gas hydrates are very important for evaluating the resource potential. Presence of gas hydrates in sediments above the bottom simulating reflector or BSR is associated with low attenuation or high quality factor (Q), whereas, free gas bearing sediments below the BSR exhibit high attenuation or low seismic Q. Here the logarithm spectral ratio (LSR) method is applied to marine seismic reflection data along two cross lines (18 and 46) in the Krishna-Godavari (KG) basin in eastern Indian margin, where gas hydrates have already been established by drilling/coring. The interval Qs is calculated for three sedimentary layers (A, B, and C) bounded by the seafloor, BSR, one reflector above and another reflector below the BSR at some common depth points (CDPs) to study the attenuation characteristics of sediments across the BSR. The estimated average interval Q (160) for the hydrate bearing sediments (layer B) is much higher than the average interval Q (80) for both the loose clayey sediments (Layer A) and underlying free gas saturated sediments (layer C). This demonstrates that estimation of seismic quality factor Q can be used for characterization of gas hydrate reservoir.

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Issue

Volume 90, Issue 3, September 2017 Pages (259-384)

Section

Research Articles

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Published

2017-09-01

How to Cite

Jyothi, V., Sain, K., Pandey, V., & Bhaumik, A. K. (2017). Seismic Attenuation for Characterization of Gas Hydrate Reservoir in Krishna-Godavari Basin, Eastern Indian Margin. Journal of Geological Society of India, 90(3), 261–266. https://doi.org/10.1007/s12594-017-0713-9
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