Mechanical Properties Card Options (EOR-BO)

Geologic media in STOMP-EOR-BO is considered to be slightly compressible.  Compressibility is considered to be an intrinsic property of a rock/soil type.  Compressibility can be specified via three options: 1) specific storage, 2) pore compressibility, or 3) bulk compressibility.  Specific storage is converted to bulk compressibility via the specified diffusive porosity and an standard compressibility of water.  Bulk compressibility is the change in the bulk rock volume with respect to change in pressure at constant temperature:

Pore compressibility is the change in pore volume with respect to change in pressure at constant temperature:

Bulk and pore compressibility can be related as:

Specific storage is  the amount of water that a portion of an aquifer releases from storage, per unit mass or volume of aquifer, per unit change in hydraulic head, while remaining fully saturated.  Specific storage can be expressed in terms of water density, porosity, water compressibility and bulk rock compressibility as:

References