Seismic energy attenuation in miocene succession in the Area East Gharib, Gulf of Suez, Egypt

Abstract EN

The aucnuarion of seismic energy in Miocene succession has been investigated in a deep borehole of East Gharih.

GulfofSuez.

This has been done through the spectral analysis of the available successive downgoing waves of vertical seismic profiling.

The related amplitude spectra of Miocene succession arc then treated in order to differentiate the individual and cumularivc attcnuations of seismic cnergy in this thick succession (9100 ft) .

11 has hccn found that thc seismic energy has attenuation values of 0.53 db/lOOHz.

100ft and D.75 dh/lOOllz .

100ft in the upper and lower parts of Miocene succession.

rcspccuvcly.

These attenuations Can be attributed to the cyclic nature of the evaporitic upper parI of succession.

and to the cxisrenee of low velocity saudstoncs which arc repeated alternatively with shales in its lower part.

Comparison of the result, obtained from this work with those from simila r studies in the surrounding area at Ras Budran, further north.

shows that the Miocene succession has approximately the same attenuation charactcrist ics all over the central part of the Gulf of Suez.-