FIELD: acoustics.
SUBSTANCE: invention relates to acoustic formation studies. Method of estimating fractures in an earth formation including: disposing an acoustic tool in a cased borehole in an earth formation, wherein the acoustic tool includes a multipole acoustic transmitter and an acoustic receiver; transmitting an acoustic signal into the borehole; measuring deep shear wave (DSW) signals generated from shear body waves reflected in the formation in a far-field region of the formation around the borehole; and estimating at least a location and an orientation of a fracture in the formation based on the DSW signals.
EFFECT: proposed is a method of estimating fractures in an earth formation.
15 cl, 6 dwg
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