Simultaneous Inversion of Layered Velocity and Density Profiles Using Direct Waveform Inversion (DWI): 1D Case

To better interpret the subsurface structures and characterize reservoir, a depth model quantifying P-wave velocity together with additional rock’s physical parameters such as density, S-wave velocity, anisotropy is always preferred by geologists engineers. Tradeoffs among different can bring extra challenges to seismic inversion process. In this study, we propose test Direct Waveform Inversion (DWI) scheme simultaneously invert for 1D layered density profiles, using reflection waveforms recorded on surface. The data includes primary reflections interbed multiples. DWI implemented in time-space domain then followed wavefield extrapolation downward continue source receiver. By explicitly enforcing causality, recursively determine structure local layer-by-layer fashion both sharp interfaces properties of layers, from shallow deep depths. layer stripping methods frequency domain. not requiring global initial model, also avoids many nonlinear optimization problems, minima or need an accurate most waveform schemes. Two numerical tests show validity serving new strategy multi-parameter inversion.