GRRM/How To/ResourceGrade

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Applying the Methodology to Geothermal Projects




Resource Grade

The “grade” of a geothermal resource can be described as a combination of these intrinsic features of the geology that differentiate geothermal projects. The GRRM expands upon the concept of grade by considering not only the physical attribute ("character"), but also how the attribute is measured ("technique") and what is known about the quality of the data ("execution").

This section provides the details necessary to determine the GRRM values for each of these indices and attributes for individual projects.

Attributes of Geothermal Systems

The GRRM evaluates the features of geothermal systems through a combination of the following four "attributes":

Temperature:
the in-situ reservoir temperature of the geothermal fluid

Volume:
the size of the reservoir (both in terms of thickness and area/extent)

Reservoir:
the permeability and porosity of the reservoir formations, as well as fluid availability

Fluid Chemistry:
the background chemistry of the geothermal reservoir fluids as it pertains to the ability of the fluids to cause corrosion or scaling


Each of these attributes is assessed independently for each project - in other words, each project is assigned a total resource grade for temperature, volume, reservoir and fluid chemistry.
Character Index

Each project is assigned an overall character index value for each attribute that best represents the unique geologic features of that project area. Refer to these tables to determine what data is used for each of the character indices.

Technique Index

Each character index value for each attribute is assigned a technique index value that best represents the technique(s) used in the analysis. Refer to these tables to determine what techniques have already been indexed. If you are using a technique not listed here, contact us to have it added.

Execution Index

Each technique index value for each attribute is assigned an execution index value that best represents the diligence with which the best scientific method was followed. Refer to these tables to determine how data collection has been categorized for each of the techniques of the attribute technique indices. If you are using a technique not listed here, please contact us in order to add details on the methodology as an execution index.

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