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Exploration Geostatistics

Competency Statement:

Use statistical methods to describe the characteristics of the hydrocarbon-bearing system. Validate the description by comparing data with reservoir analogs. Establish supporting trends for predicting properties in both drilled and non-drilled areas. Characterize dependence among multiple variables. Describe risk and uncertainty using probabilistic distributions.

Learning Objective:

  • Apply preliminary statistical analysis methods to geological data.
  • Apply conventional techniques to validate reservoir data and trend maps.
  • Demonstrate an understanding of risk and uncertainty in probabilistic distributions. 
  • Build single model variograms for simple reservoir properties.
  • Apply basic Kriging techniques to generate representative reservoir parameter maps.

Assignment Instruction:

Beta Petroleum has drilled a wildcat (Gama 1) and three delineation wells (Gama 2, Gama 3, and Gama 4) on a structure in the New Basin. All of the wells have been logged and a whole core taken of the reservoir in Well # 3 and conventional core analysis undertaken on 10 plugs. A facies Scheme has been developed.

You are to:

  1. Extend and extrapolate the well data across the field, by creating maps of petrophysical properties, for the purpose of developing a static reservoir model
  2. Assist in the refinement of the facies model, by investigating possible scenarios consistent with the data and interpretation, to provide a framework for the properties;
  3. Using this model (properties and geometrical framework) to predict likely bounds on the oil in place
  4. Extend this work to the development of a preliminary dynamic model, including fluid flow characteristics