... in capturing small changes. However, all methods tend to suffer from the imperfect repeatability of the data acquisition and the weakness in FWI in focussing on the affected areas (i.e. the reservoir). Thus, we modify the subspace method and apply it to time-lapse elastic full waveform inversion. A soft mask...

... characterization seg seg international exposition annual meeting reference list multi parameter multi-parameter acoustic fwi multi-parameter inversion subspace method application geophysics waveform inversion upstream oil & gas case study model parameter inversion Kennett , B. L. N...

... Summary We propose an extended subspace method for reducing crosstalk when inverting geophysical data to infer models for two or more subsurface physical properties. Our algorithm uses gradients of an objective function as basis vectors for forming model updates. The extended set of basis...

... frequency components into waveform inversion without abandoning lower-frequency components. We construct the gradient for multi-frequency components in two ways; either by simply summing gradients from a single frequency, or by summing gradients weighted by the subspace method. Based on synthetic and real...

... reflectivity subspace method wavelet extraction wavelet application seismic data identification seismic wavelet reservoir characterization wavelet estimation seg seg denver 2010 curve represent model wavelet seismic trace noise subspace upstream oil & gas mixed-phase wavelet...

... Summary Dispersion estimation of propagating waves is extremely useful in borehole acoustics, in order to distinguish between different types of waves and to understand an Earth formation. By investigating several techniques for dispersion estimation we find subspace methods, based on data...

... ABSTRACT No preview is available for this paper. inverse problem instrumentation tuesday basement anomaly brazil upstream oil & gas reconcavo basin reservoir characterization equality constraint basement relief subspace method geophysics information basin equation...