What is variable permeability?
Variable head permeability test is one of several techniques by which the permeability of soil is determined. It is used to evaluate the permeability of fairly less previous soil. Permeability is the measure of the ability of soil to allow water to flow its pores or voids.
What is degree of homogeneity in reservoir engineering?
The degree of homogeneity of a reservoir property is a number that characterizes the departure from uniformity or constancy of that particular measured property through the thickness of the reservoir.
How is Lorenz coefficient calculated?
The Lorenz coefficient Lc is two times the area enclosed between the Lorenz curve ABC in the figure and the diagonal AC. The range of the Lorenz coefficient is 0 ≤ L c ≤ 1 . For a homogeneous reservoir, the Lorenz coefficient satisfies the equality Lc = 0.
What is Dykstra Parsons coefficient?
The coefficient of variation, or Dykstra–Parsons coefficient (VK), is another measure of heterogeneity. It is a dimensionless measure of sample variability or dispersion [77]. It is defined as the ratio of the sample standard deviation(s) to the mean.
What is meant by permeability?
Definition of permeability 1 : the quality or state of being permeable. 2 : the property of a magnetizable substance that determines the degree in which it modifies the magnetic flux in the region occupied by it in a magnetic field.
What is heterogeneity in reservoir?
Reservoir heterogeneity refers to the uneven changes in spatial distribution and internal properties of oil and gas reservoirs due to the influence of sedimentary environment, diagenesis, and tectonic processes during the formation process. Such changes are called reservoir heterogeneity.
What is the difference between Gini index and Gini coefficient?
The Gini index is the Gini coefficient expressed as a percentage, and is equal to the Gini coefficient multiplied by 100. (The Gini coefficient is equal to half of the relative mean difference.) The Gini coefficient is often used to measure income inequality.
What is permeability and permittivity?
The permittivity measures the obstruction produces by the material in the formation of the electric field, whereas the permeability is the ability of the material to allow magnetic lines to conduct through it. The permittivity is represented by ε whereas μ represents the permeability.
What is heterogeneity in oil and gas?
Reservoir heterogeneity refers to the uneven changes in spatial distribution and internal properties of oil and gas reservoirs due to the influence of sedimentary environment, diagenesis, and tectonic processes during the formation process.
What is meant by Gini coefficient?
The Gini index, or Gini coefficient, measures income distribution across a population. Developed by the Italian statistician Corrado Gini in 1912, it often serves as a gauge of economic inequality, measuring income distribution or, less commonly, wealth distribution among a population.
What is meant by Gini index?
The Gini index measures the extent to which the distribution of income or consumption among individuals or households within an economy deviates from a perfectly equal distribution. A Gini index of 0 represents perfect equality, while an index of 100 implies perfect inequality. Long definition.
What are the 2 types of permeability?
Absolute permeability is the measured permeability when the medium is fully saturated with one fluid only. Relative permeability describes the ability of a particular rock to allow the flow of a particular fluid.
What is difference between porosity and permeability?
More specifically, porosity of a rock is a measure of its ability to hold a fluid. Mathematically, it is the open space in a rock divided by the total rock volume (solid and space). Permeability is a measure of the ease of flow of a fluid through a porous solid.
What is Gini coefficient and Lorenz curve?
The Gini coefficient is equal to the area below the line of perfect equality (0.5 by definition) minus the area below the Lorenz curve, divided by the area below the line of perfect equality. In other words, it is double the area between the Lorenz curve and the line of perfect equality.
What is Darcy law of permeability?
Darcy’s law governs flow of oil, water, and gas in porous media. Darcy’s law says that the flow rate at any point in the reservoir is given by the fluid pressure gradient, the viscosity of the fluid, and its effective fluid permeability.
What is the difference between permeability and hydraulic conductivity?
Hydraulic conductivity of soil is a measure of the its ability to transmit water when submitted to a hydraulic gradient. The coefficient of permeability (k) represents the soil’s ability to transmit and drain water.