| Summary: | This paper reviews various seismic inversion techniques (AVO, acoustic-, and elastic-impedance, pre-stack waveform inversion) for assessing elastic parameters of sediments and more specifically hydrate-bearing sediments. Several theoretical approaches are described and examples of the application of the inversion schemes to assess gas hydrate deposits in three different geological environments are compared. The first example is from a permafrost-related gas hydrate deposit at Mallik, the second example is from the Blake Ridge offshore Carolina (location of Ocean Drilling Program Leg 164), and the third example is from the Golf of Mexico (Atwater Valley and Keithley Canyon). The techniques used in these areas are band-limited acoustic impedance inversion (Mallik), post-stack elastic impedance inversion (Blake Ridge), and a hybrid inversion scheme utilizing pre-stack waveform inversion with post-stack AVO-inversion (Golf of Mexico).
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