Abstract
The P-wave reflection coefficient at an interface separating two media
is known to vary with angle of incidence. The manner in which it
varies is strongly affected by the relative values of Poisson's ratio
in the two media. For moderate angles of incidence, the relative
change in reflection coefficient is particularly significant when
Poisson's ratio differs greatly between the two media. Theory and
laboratory measurements indicate that high-porosity gas sands tend
to exhibit abnormally low Poisson's ratios. Embedding these low-velocity
gas sands into sediments having "normal" Poisson's ratios should
result in an increase in reflected P-wave energy with angle of incidence.
This phenomenon has been observed on conventional seismic data recorded
over known gas sands.
Users
Please
log in to take part in the discussion (add own reviews or comments).