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80 Applied Petroleum Geomechanics

where Dt s_ma is the shear transit time of the matrix; Dt s is the shear transit
time of the rock. Therefore, if well log data are available (porosity and
shear velocity or shear transit time), Biot’s coefficient can be obtained
from Eq. (2.94).
Fig. 2.31 displays an example using well log data and Eq. (2.94) to
compute Biot’s coefficient by assuming Dt s_ma ¼ 100 ms/ft.

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