Deconvolution

Ahmed El_Sayed Hamza4th level Geophysics

Geology Department_SCU

*A step in seismic signal processing to recover high frequencies, attenuate multiples, equalize amplitudes, produce a zero-phase wavelet or for other purposes that generally affect the wave shape.

*Objective: 1-Increase the vertical resolution of the data.

2-Increasing the vertical resolution of the data increase our ability to see subsurface layers.

3-Attenuate periodic multiple energy

Before Deconvolution

After Deconvolution

*Types of Deconvolution:1. DBS & DAS• DBS: is Deconvolution before stack (standard process applied to all data)DBS removes any short multiples & reverberations (relatively short200-400ms)• DAS: is Deconvolution after stack (mainly used in marine data)DAS removes long period multiple

2. Spike Deconvolution & Predictive Deconvolution:• Spike Deconvolution: used for sources as air gun & Dynamite (used before stack).• Predictive Deconvolution: used for sources as Weight drops (which doesn’t generate many high frequencies)

Outcomes

Positive• Improved Resolution• Multiple Energy Attenuated

Negative· Increased B/W can boost

random noise· Non Deterministic Process

Thanks