Abstract

Experiments with synthetic seismograms from two wells let us confirm a conclusion of O'Doherty and Anstey that seismic attenuation due to layering alone arises from a combination of the transmission losses through the interfaces of a layered subsurface and the generation of intrabed multiple reflections. Transmission losses lower the amplitudes uniformly at all frequencies. Intrabed multiples tend to raise the amplitudes at the low-frequency end of the spectrum and lower those at the high-frequency end. For the wells studied, intrabed multiples higher than fifth order (10 msec delay) were unimportant. Attenuation due to layering accounted for 1/3 to 1/2 of the total frequency dependent attenuation estimated from field seismograms at the well locations.

This content is PDF only. Please click on the PDF icon to access.

First Page Preview

First page PDF preview
You do not currently have access to this article.