Dykstra-Parsons coefficient

Megascopic Dispersivity. The megascopic scale is the full-aquifer dispersivity whose value determines the volumetric sweep in numerical simulation blocks. Figure 3 shows the behavior of (expressed as inverse Peclet number) as a function of time for miscible displacements in a two-dimensional stochastic permeability field. The parameter V is the Dykstra-Parsons coefficient, a dimensionless measure of the spread of the permeability distribution to which the flow field was conditioned. = 0 corresponds to a... 

The Dykstra-Parsons coefficient is a normalized measure of the spread of a permeability distribution that is bounded between zero and one. The formal definition is... 

Figure 18. Bias of Dykstra-Parsons coefficient estimator of heterogeneity as functions of number of samples and numerical value of V. Curves were theoretically derived from a single-population, log-iiormal distribution. (Reproduced from Ref. 5 )...

The reservoir has a Dykstra-Parsons coefficient of 0.6 and is assumed to be represented by five noncommunicating layers with properties given in Table 5.35. Relative permeability curves for oil/water and oil/polymer systems are represented by... 

Here,/is initial water cut value before the polymer flood 2 is the proportion of the channel sand body kd is permeability ratio Vk is Dykstra-Parsons coefficient of permeability variation m is well pattern density and 0 is a factor affected by the polymer-injection formula (that is to say, how much the effectiveness is affected by factors such as concentration, viscosity, and polymer-bank size). R is the oil recovery before polymer flood N is the connectivity factor between injectors and producers S is the proportion of wells with separate layers and B is the proportion of the wells that adopted the measures of profile modification. 

Dykstra-Parsons coefficient of permeability variation, fraction... 

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