Computations of effective elastic moduli of porous/cracked rocks have been performed by using three distinct theories. The first one, the differential scheme, accounts at best for fluid content, crack interactions and connectivity. When compared with the second one (poroelasticity), it gives consistent results for round pores. For a crack porosity, there is also a good agreement for the bulk modulus, but not for the shear modulus. The differential scheme shows that this last modulus depends on fluid properties. The third theory is a semi-empirical model (Bound Averaging Method) which can be calculated explicitly from the differential scheme.

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