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  2. Kriging - Wikipedia

    en.wikipedia.org/wiki/Kriging

    In statistics, originally in geostatistics, kriging or Kriging (/ ˈ k r iː ɡ ɪ ŋ /), also known as Gaussian process regression, is a method of interpolation based on Gaussian process governed by prior covariances. Under suitable assumptions of the prior, kriging gives the best linear unbiased prediction (BLUP) at unsampled locations. [1]

  3. Regression-kriging - Wikipedia

    en.wikipedia.org/wiki/Regression-kriging

    In applied statistics and geostatistics, regression-kriging (RK) is a spatial prediction technique that combines a regression of the dependent variable on auxiliary variables (such as parameters derived from digital elevation modelling, remote sensing/imagery, and thematic maps) with interpolation of the regression residuals.

  4. Winterization of oil - Wikipedia

    en.wikipedia.org/wiki/Winterization_of_oil

    Winterization of oil is a process that uses a solvent and cold temperatures to separate lipids and other desired oil compounds from waxes.Winterization is a type of fractionation (also known as fractionate crystallization), the general process of separating the triglycerides found in fats and oils, using the difference in their melting points, solubility, and volatility.

  5. Inverse distance weighting - Wikipedia

    en.wikipedia.org/wiki/Inverse_distance_weighting

    is a simple IDW weighting function, as defined by Shepard, [3] x denotes an interpolated (arbitrary) point, x i is an interpolating (known) point, is a given distance (metric operator) from the known point x i to the unknown point x, N is the total number of known points used in interpolation and is a positive real number, called the power ...

  6. Variogram - Wikipedia

    en.wikipedia.org/wiki/Variogram

    One is thus making a distinction between the experimental variogram that is a visualization of a possible spatial/temporal correlation and the variogram model that is further used to define the weights of the kriging function.

  7. Naphthenic oil - Wikipedia

    en.wikipedia.org/wiki/Naphthenic_oil

    The differences between these different types of oils are not clear-cut, but mainly depend on the predominant hydrocarbon types in the oil. Paraffinic oil, for example, contains primarily higher alkanes, whereas naphthenic oils have a high share of cyclic alkanes in the mixture.

  8. Distillate (motor fuel) - Wikipedia

    en.wikipedia.org/wiki/Distillate_(motor_fuel)

    North American distillate is broadly described as a fuel with heavier molecular weight than gasoline, and similar to or lighter than kerosene or No. 1 fuel oil. However, both usage of the term and formulation of the product varied widely. Octane ratings varied similarly, between 33 and 45. [1] [2]

  9. Oil in place - Wikipedia

    en.wikipedia.org/wiki/Oil_in_place

    The oil in place is calculated as the product of the volume of porous oil-bearing rock, the porosity of the rock, and its saturation. [1] Correction factors have to be applied for the difference between the volume of the same mass of oil in the reservoir to its volume when brought to the surface, which is caused by the different physical ...