Manual Page for Command >> COMPRESSIBILITY
This command selects as a parameter the pore space compressibility c
(TOUGH2 variable COM(NMAT)) of a certain rock type.
It is suggested to estimate the logarithm of c. Under fully liquid-saturated
conditions, pore space compressibility estimates c can be converted to a
specific storage coefficient S [1/m] as follows:
Ss = phi*rho*g*(cl + c)
where phi is porosity, rho is density of water, g is gravitational
acceleration, and cl = 4.4E-10 [1/Pa] is water compressibility.
Similarly, estimation of c for grid blocks representing a well or borehole
is useful for the determination of a dimensionless wellbore storage
coefficient Cbh :
Cbh = phibh *rho*g*Vbh*(Sl* cl + Sg * cg + c)
where phibh and Vbh are the porosity and volume of the grid block representing
the well, Sl and Sg are the liquid and gas saturation, and cg is gas
compressibility which is approximately 1/p.
>> pore space COMPRESSIBILITY
>>> MATERIAL: BOREH
>>>> ANNOTATION: Wellbore storage
>>>> RANGE : -10.00 -7.0
>>> MATERIAL: SKIN_ ROCK_ BOUND
>>>> ANNOTATION: Storativity
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Page updated: July 29, 1997