Phase Decomposition

for tuning effect elimination and HC contour highlight

Original Seismic

Phase decomposition for 90- degrees component

Phase decomposition for 0- degree component

Oil

Oil

Oil

Theory

Synthetic gather with linear phase shift from 0 to 90 degrees

Phase

decomposition for 0- degree component

Phase

decomposition for 90- degrees component

Thin layers and HC effects are often accompanied by phase anomalies. These can be detected by decomposing the phase.

 

On this slide we show Synthetic gather with linear phase shift from 0 to 90 degrees. This shift would normally be corrected by higher velocity or trim static correction.

Such feature could be due to fluid effect and seismic velocity should be picked on the 0 phase decomposed gather.

 

Phase decomposition 90 degree  gather emphasizes the fluid effect on the far offsets.

Wedge model

Wedge phase decomposition 0

The Wedge model (shown to the left here) illustrates tuning effect – bright amplitude in the moment of tuning.

 

Thin layers and HC effects are often accompanied by phase anomalies.

 

The Wedge phase decomposition 0 and 90 degrees allows easily the separation of thin and thick layers.

 

Wedge phase decomposition 90

Original seismic

Original seismic

Phase decomposition 0

Phase decomposition 0

Phase Decomposition 90

Phase Decomposition 90