Full-waveform inversion method is used to estimate subsurface velocity structure. This method directly utilizes observed waveform data that could deform by the change in the properties of subsurface materials. In general, the difference between the observed and the modeled waveforms are minimized to estimate the subsurface properties in terms of seismic velocities. In contrast to the existing FWI applications, our research focuses directly on the properties in the hydrocarbon reservoir to estimate the fluid distribution and alteration. We solve the elastic problem with FWI, updating P-wave velocity distribution. One parameter full-waveform inversion based on conjugate gradients algorithm for the synthetic model give us reconstruct the model similar to the true, separated-layer model.


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