... Implementation of the standard full waveform inversion (FWI) poses difficulties as the initial model offsets from the true model. The wavefield reconstruction inversion (WRI) was proposed to mitigate these difficulties by relaxing the waveequation constraint. In this abstract, working...

...: 11:00 AM Location: 351D Presentation Type: Oral reservoir characterization frequency selection relaxation optimization problem objective function waveform inversion artificial intelligence constraint conventional fwi wri upstream oil & gas initial model wavefield inversion...

... to consider the wave equation, not as a hard constraint, but as a soft constraint to be satisfied only approximately – a technique known as wavefield reconstruction inversion (WRI). WRI weakens wave-equation constraints by introducing wave-equation misfits as a weighted penalty term in the objective function...

... ABSTRACT Wavefield reconstruction inversion (WRI) is an improved full waveform inversion theory proposed in recent years. This method can expand the searching space by modifying the objective function, the model gradient is based on reconstructed wavefield which greatly improves the computing...

... is the number of receivers. P is the operator that restricts the wavefields onto the receiver locations. The discretized Helmholtz matrix has the form A v ( ) = ?2/v diag( m )+ L , where ? v is angular frequency and L is a discrete Laplacian. wavefield hessian wri frequency geophysics...