Hydraulic fracturing to determine

Hydraulic fracture initiation in vertical

well

Leako� test (mini-frac, FIT, XLOT)

© Cambridge University Press (Fig. 7.2, pp. 211)Zoback, Reservoir Geomechanics

from instantaneous shut-in pressure

© Cambridge University Press (Fig. 7.3, pp. 213)Zoback, Reservoir Geomechanics

© Cambridge University Press (Fig. 7.3, pp. 213)Zoback, Reservoir Geomechanics

Step-rate test

© Cambridge University Press (Fig. 7.5, pp. 216)Zoback, Reservoir Geomechanics

Be careful!

When integrate density logs

© Cambridge University Press (Fig. 7.4, pp. 214)Zoback, Reservoir Geomechanics

What about ?

so

or

Does it work?Consider a system with compressibility

Answer: Not very well.