Q = water flow rate, K = constant of proportionality that is characteristic of the sand packĪ = cross-sectional area of the sand pack Manometers located at the input and output ends measured fluid pressures, which were then related to flow rates to obtain the following fundamental Darcy's law: Fractures have infinite permeability.ĭarcy's fundamental law is given below if water was allowed to flow downward through the sand pack contained in an iron cylinder. Commonly, permeability in the range of 100 to 500 md is a reasonable value for a petroleum reservoir rock. Permeability is measured in millidarcy (md) or Darcy (1000 md) of these narrow throats. The sand in the container has narrow pore throats between the large pores that allow fluid to pass from one pore to another. Permeability is a measure of the connectivity of pores in the subsurface. During the burial of this sand, compaction reduces this porosity substantially to where only a small percentage of porosity is left. If petroleum is present, it can also occupy this pore space. For example, well-sorted sand in a 300 ml container will hold about 100 ml of water in its pore space, or porosity of 33%. Porosity is a measure in percentage of pore volume or size of holes per unit volume of rock.
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