From Open Energy Information

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Other Resource Reporting Systems

Types of Systems

The basis for the content of the GeoRePORT System is a prior literature review of types of classification systems. This review found that geothermal systems are typically grouped by the following three areas:

  • Play Type: also called "occurence model," these systems categorize by the geologic setting
  • Grade: these systems categorize natural resources by a quality scale
  • Project Progress: these systems organize projects by delineating stages of exploration and development
  • Economic Viability: these systems delineating stages of exploration and development based on whether the resource can be sold with a higher residual value than the costs of extraction

Further details on these literature sources can be found on the Related References page.

Classification by Play Type

Although research on classifying geothermal systems by play type has been done by many, the GeoRePORT System primarily looked into the following three examples for context:

In these three systems, the categorization is based on how the reservoir properties (such as permeability and porosity, fluid circulation, and/or fault distribution) control heat transport.

Classification by Grade

To date, no classification exists for geothermal systems based on a holistic concept of resource grade. The nearest system to the GeoRePORT System concept of grade is in the form of temperature classifications; in fact, the Sanyal temperature classification was used as the basis for the GeoRePORT temperature character index. However, as shown in the table below, the concepts of grade vary significantly between resources:

Resource Quality System Comparable Unit Bounds Component
WIND Wind Power Class Unit-less Value (1 to 7) W/m2 Includes:
  • Wind speed and air density (adjusted for elevation, pressure, and temperature)
  • Qualitatively evaluated/adjusted for effects/evidence of topographic features
SOLAR Insolation kW/m2 none Includes:
  • Hourly radiance images from weather satellites
  • Daily snow cover data
  • Averages of atmospheric water vapor, trace gases, and the amount of aerosols in the atmosphere
Radiation kW/m2 none Includes:
  • Solar radiance
URANIUM ORE Grade Terminology
(low to extra high grade)
Lbs eU3O5/ton and/or percent Includes:
  • Volume of ore (area and thickness)
  • Specific density of ore
COAL Grade: degree of impurities and calorific value Terminology
(standard to ultra-high)
Percent weight carbon Includes:
  • Useful heat value
  • Ash + moisture content (from measured moisture, ash yield, mineral matter, total sulfur content), and/or
  • Gross calorific value (from heat of combustion)
Rank: degree of maturation (metamorphism or coalification) Terminology (lignite to anthracite) Multi-factor:
  • % fixed carbon
  • % volatile matter
  • BTU/lb or MJ/kg
  • Carbon content (adjusted to remove moisture and mineral matter content)
  • % volatile matter (adjusted to remove moisture and mineral matter content)
  • Gross calorific value (adjusted to remove mineral matter)
CRUDE OIL Terminology
(heavy to light)
API gravity Includes:
  • Oil density
(sour to sweet)
% sulfer content Includes:
  • Sulfur content

Further details on these literature sources can be found on the Related References page.

Classification by Project Progress

The Geothermal Energy Association's project phases are a widely-known US standard for describing the stages of project development. These categories include criteria for an understanding of the resource, the feasibility of transmission, and external development requirements such as financing and permit status.

Classification by Economic Viability

Looking internationally, natural resource standards primarily categorize projects by a combination of project progress and economic viability. The following table highlights concepts from this analysis's literature review of standards covering minerals, uranium, oil and gas, and geothermal.

Summary of Resource Reporting Standards
Reporting Standard Title Author Locality Mandatory Financial Standard?
MINERALS (Coal, Industrial Minerals, Gemstones)
International Reporting Template Committee for Mineral Reserves International Reporting Standards (CRIRSCO) International: Australia, Canada, Chile, Europe, Russia,

South Africa, United States

All except US
SME Guide for Reporting Exploration Results, Mineral Resources, and Mineral Reserves2 (2007, 2014-draft) Society for Mining, Metallurgy and Exploration (SME) United States No – SEC Industry Guide 7
Uranium - Resources, Production and Demand “Red Book” International Atomic Energy Association – OECD Nuclear Energy Agency (NEA) International No
Petroleum Resource Management System (PRMS) Society of Petroleum Engineers (SPE)
American Association of Petroleum Geologists (AAPG)
World Petroleum Council (WPC)
Society of Petroleum Evaluation Engineers (SPEE)
Society of Exploration Geophysicists (SEG)
International No - SEC Industry Guide 2
Classification of Oil and Gas Fuel Reserves and Resources5 Russian National Resource Ministry Russian Federation Yes
Geothermal Reporting Terms and Definition for Reporting Resource Development Progress and Results Geothermal Energy Association (GEA) United States No
Australian Code for Reporting Geothermal Resources and Reserves Australian Geothermal Energy Group (AGEG)
Australian Geothermal Energy Association (AGEA)
Australia No
Canadian Geothermal Code Canadian Geothermal Energy Association (CanGEA) Canada No
Geo-Elec Methodology of Resource Assessment Intelligent Energy Europe (IEE) Europe No