8 Module Variogram Models; M. Makkawi, PhD

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Semivariogram Models• It is a mathematical expression that results from

curve fitting a function to the experimental variogram.

• Models are used to determine variogram parametersthat are necessary in both estimation (kriging) and conditional simulation procedures.

• Model variograms can be classified according to the presence or absence of sill into two groups:

• Models with sill (transition models)• Models without sill (drift or trend models)

8 Module Variogram Models; M. Makkawi, PhD

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Semivariogram Models

8 Module Variogram Models; M. Makkawi, PhD

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Models with Sill

8 Module Variogram Models; M. Makkawi, PhD

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Models with Sill

8 Module Variogram Models; M. Makkawi, PhD

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Models without Sill

8 Module Variogram Models; M. Makkawi, PhD

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Models without Sill

8 Module Variogram Models; M. Makkawi, PhD

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Types of ContinuityContinuous Variogram

8 Module Variogram Models; M. Makkawi, PhD

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Types of ContinuityLinear Variogram

8 Module Variogram Models; M. Makkawi, PhD

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Types of ContinuityNugget Variogram

8 Module Variogram Models; M. Makkawi, PhD

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Types of ContinuityRandom Variogram

8 Module Variogram Models; M. Makkawi, PhD

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Zone of InfluenceVariogram Ranges

8 Module Variogram Models; M. Makkawi, PhD

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Zone of InfluenceGeologic Structure Ranges

8 Module Variogram Models; M. Makkawi, PhD

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AnisotropyGeometric Anisotropy

8 Module Variogram Models; M. Makkawi, PhD

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AnisotropyZonal Anisotropy