Quantitative comparison between dipole log and VSP in anisotropic rocks from Cymric Oil Field, California
Conference
·
OSTI ID:542815
- and others
Multicomponent VSP and seismic measurements are traditionally used to measure shear-wave birefringence in anisotropic rocks. Crossed-dipole shear logs measure flexural mode birefringence which, at low frequencies, should be identical to shear-wave birefringence in the absence of borehole related phenomena such as alteration, stress-relief, ellipticity, etc. A quantitative comparison between a multicomponent VSP and crossed-dipole logs in rocks previously reported to exhibit large shear-wave birefringence and depth-variable fast shear-wave polarization azimuths is made. It is found that the crossed-dipole measurements agree quantitatively with the VSP measurements with respect to the fast and slow shear-wave transit times and the fast shear-wave polarization direction. The crossed-dipole measurements reveal significant vertical variability of the anisotropy parameters.
- OSTI ID:
- 542815
- Report Number(s):
- CONF-951013--
- Country of Publication:
- United States
- Language:
- English
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