Seismis inversion

Post-stack vs. pre-stack

Similarities

• The stratigraphic interpretation is easier on impedance data because P-impedance is a layer property .
• High resolution of layers by reducing wavelet effects, side lobes, and tuning.

Differences

• P-impedance can be directly computed and compared to well data.
• Relation between porosity and acoustic impedance.
• Color inversion can be used with or without a well data and a background model.
• Post-stacking is cheap and easier to process .
• Pre-stacking is more efficient to identify lithology and fluid content .
• Pre-stacking identifies both acoustic impedance and shear impedance .
• Pre-stacking is the best method to estimate V_p/V_s ratio.
• Post-stacking uses a single seismic trace while Pre-stacking uses a linear model of AVO.
  

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