Patent ID: 8521433

Claim:
A method of processing acoustic waveform data relating to a subterranean formation, comprising: taking acoustic measurements through the subterranean formation at one or more depths of a borehole traversing a subterranean formation; deriving a complex and frequency dependent slowness of the formation based on wavefields in the acoustic measurements, wherein deriving the slowness comprises performing parametric inversion for the complex and frequency dependent slowness; modeling dominant wavefields in the acoustic measurements based on the derived formation slowness; iteratively minimizing the misfit between input and modeled waveforms by varying and determining a set of geometrical spreading and slowness parameters that minimize the misfit; generating dominant wavefields based on the set of geometrical spreading and slowness parameters; subtracting the dominant wavefields from the input waveforms for event signals, whereby the event signals are extracted from the acoustic measurements comprising reflected and/or refracted waveforms in the subterranean formation.