Azimuthal anisotropy characterization with multicomponent virtual shear sources at Rulison Field, Colorado

Prajnajyoti Mazumdar, Albena Mateeva, Andrey Bakulin
2008 SEG Technical Program Expanded Abstracts 2008   unpublished
We apply a new method for birefringence analysis at depth to a tight gas reservoir in Rulison Field, Colorado. The new method is based on a multicomponent version of the virtual source method in which VSP receivers are turned into virtual shear sources in the zone of interest. This allows accurate detection of even small amounts of azimuthal anisotropy under complex overburden where traditional methods fail. We used the new method to measure shear wave splitting of less than 1% in a reservoir
more » ... 1% in a reservoir under significantly anisotropic overburden. That was enough to infer fracture orientation, which turned out to be close to the orientation interpreted from FMI logs.
doi:10.1190/1.3059402 fatcat:l74yavh7gbestdygjoar6oods4