2018 SEG International Exposition and Annual Meeting,
Anaheim, California, USA
2018. Society of Exploration Geophysicists
4 in the last 30 days
50 since 2007
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Acoustic logging-while-drilling (LWD) is used to measure formation velocity/slowness during drilling. In a fast formation where the formation shear velocity is larger than the borehole fluid velocity, monopole logging can be used to obtain both formation compressional and shear velocities by measuring the corresponding refracted waves. In a slow formation where the shear velocity is less than the borehole fluid velocity, because of the missing of fully refracted shear wave, quadrupole logging has been developed and used for shear slowness measurement. Recently, it has been found that monopole LWD can generate a detectable transmitted shear wave in a slow formation. This nondispersive transmitted shear wave propagates at the formation shear velocity and thus can be used for measuring the shear slowness of a slow formation. In this paper, we study the shear slowness measurement derived from a monopole LWD dataset acquired in a slow formation and compare it with the result extracted from the quadrupole data recorded in the same logging run.
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