Thursday, January 22, 2015

Instataneous Frequency Seismic Attribute

A lowering of instataneous frequency is often observed immediately under hydrocarbon accumulations. Such "low-frequency shadows" seem to be confined to a couple of cycles below (not at) accumulations.  No adequate explanation is available, proposed explanations generally involve either the removal of higher frequencies because of absroption or other mechanisms, or improper stacking because of erroneous velocity assumptions or raypath distortions.

(Sherrif. 1995. Exploration Seismology. )

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