Abstract

We perform the post stack acoustic impedance inversion along a 2D seismic line passing through site NGHP-01-9A in the Mahanadi offshore with a view to deriving reservoir properties such as the porosity that can be used for the estimation of gashydrates. We have used the density derived porosity ranging from 50% to 75%, in the depth interval of 1935 to 2258 m, as an input for porosity inversion from post-stack seismic data, where BSR (marker for gas-hydrates) are observed. A very good correlation (0.8) between the acoustic impedance and porosity is observed. The lateral extent of porosity along the 2D seismic line varies from 52% to 68% for water bearing silt/clay sediments below the sea floor; 55% to 68% for gas-hydrates zone; and maximum of 70% for gas bearing sediments below the BSR.