... condition (no horizontal movement), is: Reservoir Characterization reservoir geomechanics Upstream Oil & Gas Biot depletion Rock mechanics variation Teufel MPa differential stress Poisson equation 13 dynamic value petroleum dynamic biot Ekofisk chalk differential pressure...

... rocks the principal strain orientations calcu- lated from ASR data can be assumed to be aligned with the principal in-situ stresses (Teufel 1983a). Comparisons between the orientation of the in- situ stresses gathered from ASR measurements with several other methods like: doorstopper, P- and S-wave...

... the borehole, strain and stress ellipsoids calculated from the measurements would enable estimates of the principal in situ stress magnitudes and directions to be made. Teufel (1983) argued that these microcracks are aligned primarily by the directions of the principal stresses and that the total microcrack...

... reservoir geomechanics Upstream Oil & Gas piezoelectric transducer velocity anisotropy microcrack acoustic emission relaxation anelastic strain recovery Sandstone Core Teufel velocity measurement relaxation microcrack Warpinski expansion deep borehole strain relaxation Magnitude...