SHAARC - Seismic Harmonic Analysis And Reflectivity Computation

SHAARC is an interactive software package for computing acoustic impedance from seismic and well log data utilising a three-stage inversion process.

Acoustic impedance is used to produce more accurate and detailed structural and stratigraphic interpretations than can be obtained from seismic (or seismic attribute) interpretation. In many geological environments acoustic impedance has a strong relationship to petrophysical properties such as porosity, lithology, and fluid saturation.

The three stages of the inversion process are:

Stage 1. Well Log Acoustic Impedance Interpolation

A well log impedance model is created using the available well logs containing impedance data and several interpreted (digitized) seismic horizons. The resulting well log acoustic impedance is used to provide the low frequency component for the second stage of the inversion process.

Stage 2. Low Frequency Compensated Acoustic Impedance

 A series of wavelets are extracted from the seismic and log data one of which is chosen to de-phase the seismic reflectivity data.

The well log acoustic impedance model is then integrated with the seismic reflectivity in the frequency domain to produce the low frequency compensated acoustic impedance volume which is utilized in the third stage.

Stage 3. Constrained Sparse Spike Acoustic Impedance

A reflectivity dataset is generated from the low frequency compensated acoustic impedance. This reflectivity along with the horizon constraints is optimized using the constrained sparse spike inversion method and is used to compute the final sparse spike acoustic impedance.

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