The generally accepted theory governing the effect of fluid content on seismic velocities is due to Biot and Gassmann, with further refinements proposed more recently. Most applications of the theory use its isotropic special case, and without these refinements (resulting in a well-known theoretical prediction for the fluid dependence of the longitudinal elastic stiffness). The present work concerns the extension of this theory to the case of anisotropy, and including these recent refinements. For thinly bedded (inhomogeneous) sequences, the theory as formulated for homogeneous formations requires special handling, in general. For the case of weak polar anisotropy, closed expressions are derived for the well-known anisotropy parameters delta, eta, and gamma. The most remarkable new result is that the anisotropy parameter eta is approximately independent of fluid content, and this applies to thinly bedded sequences without special handling.


Article metrics loading...

Loading full text...

Full text loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error