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. It can be detected by decomposing the phase.

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

Such effect could happen 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 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 allow easily to separate thin and thick layers.

Wedge phase decomposition 90

## Original seismic |
---|

## Phase decomposition 0 |

## Phase Decomposition 90 |