It is well
known that fracture properties are Fractal
by Nature. So in terms of scale, we have
and Image logs provide the small scale
features of the reservoir
seismic provides some large scale features.
of these are direct observations ... We can put our finger on these features.
is important and gives part of the
overall fracture picture.
production is not controlled only by
these end members.
it were, our reservoir models and fluid simulations would be perfect.
So how do
we fill this gap?
-Modeling has traditionally been used to fill this gap.
as geomechanical modeling to reconstruct paleo-strain fields.
But I propose that anisotropy is the logical candidate
are smaller than the seismic wavelength
So we dont
see the individual fractures but we get an average
leads to a directionally dependent
response, i.e. it is azimuthally anisotropic.
measure anisotropy at borehole with VSPs and with P-wave surface seismic
But I want to
focus on PS-waves.