Comparison Between Time Domain and Depth Domain Inversion to Acoustic Impedance
Geophysical reservoir characterization in a complex geologic environment
remains a challenge. Conventional amplitude inversion assumes reliable seismic
amplitudes. In a complex environment, inadequate illumination of the subsurface
due to complex geology or the acquisition geometry has detrimental effects on
the amplitudes and phase of the migrated image. Such effects are not
compensated for in conventional seismic inversion techniques. Consequently, an
imprint of various non-geological effects will manifest themselves in the
results of seismic inversion, leading to a less reliable estimation of the
resultant acoustic and elastic parameters.
The depth domain inversion workflow uses point spread functions to
capture the dip-dependent illumination effects due to acquisition geometry and
complex geology. The amplitude inversion is performed in the depth domain and
the output is an acoustic impedance volume corrected for illumination
This paper presents the results of a field data example with the
objective of comparing the results of the time domain inversion and the depth
domain inversion, identifying and explaining both differences and similarities.
This leads to an assessment of what should be expected from the depth domain
inversion approach, including key advantages and limitations.