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2. Water (data page) - Wikipedia

   en.wikipedia.org/wiki/Water_(data_page)

   Hence they apply only to pure phases and need a correction factor for systems in which air is present. The values were not computed according formulas widely used in the US, but using somewhat more exact formulas (see below), which can also be used to compute further values in the appropriate temperature ranges.

3. Leverett J-function - Wikipedia

   en.wikipedia.org/wiki/Leverett_J-function

   In petroleum engineering, the Leverett J-function is a dimensionless function of water saturation describing the capillary pressure, [1] = / ⁡where is the water saturation measured as a fraction, is the capillary pressure (in pascal), is the permeability (measured in m²), is the porosity (0-1), is the surface tension (in N/m) and is the contact angle.

4. Petrophysics - Wikipedia

   en.wikipedia.org/wiki/Petrophysics

   As core samples are the only evidence of the reservoir's formation rock structure, the Core analysis is the "ground truth" data measured at laboratory to comprehend the key petrophysical features of the in-situ reservoir. In the petroleum industry, rock samples are retrieved from the subsurface and measured by oil or service companies' core ...

5. Petroleum geology - Wikipedia

   en.wikipedia.org/wiki/Petroleum_geology

   The reservoir is a porous and permeable lithological unit or set of units that holds the hydrocarbon reserves. Analysis of reservoirs at the simplest level requires an assessment of their porosity (to calculate the volume of in situ hydrocarbons) and their permeability (to calculate how easily hydrocarbons will flow out of them). [ 2 ]

6. Gas/oil ratio - Wikipedia

   en.wikipedia.org/wiki/Gas/oil_ratio

   Definition of formation volume factor Bo and gas/oil ratio Rs for oil. When oil is produced to surface temperature and pressure it is usual for some natural gas to come out of solution. The gas/oil ratio (GOR) is the ratio of the volume of gas ("scf") that comes out of solution to the volume of oil — at standard conditions.

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8. R-factor (crystallography) - Wikipedia

   en.wikipedia.org/wiki/R-factor_(crystallography)

   In the Cambridge Structural Database of small-molecule structures, more than 95% of the 500,000+ crystals have an R-factor lower than 0.15, and 9.5% have an R-factor lower than 0.03. Crystallographers also use the Free R-Factor ( R F r e e {\displaystyle R_{Free}} ) [ 3 ] to assess possible overmodeling of the data.

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