GRRM/How To/Execution/Chemistry

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Applying the Methodology to Geothermal Projects




Execution Indices for Estimated Fluid Chemistry
Field Sampling | Laboratory Sampling | Alkalinity Titration

The following tables provide the content to differentiate and select the appropriate execution index values for the GRRM fluid chemistry attribute. For each technique used to estimate temperature, select the 1 - 5 index value of the category that most closely reflects the understanding of how the analytical method and technique were followed that collected the project's data.

Note: if more than 1 technique is used, select as many execution index values as the number techniques. If multiple sources of data are used (such as literature searches and independent sampling), record an execution index value for each source.

Field sampling Laboratory probe sampling Alkalinity titration
5
  • Gas and water phases measured; different phases were sampled with a mini-separator.
  • Temperature, conductivity, and pH probes used within recommended operating temperatures
  • All probes calibrated in lab daily prior to field work.
  • All probes operating well within detection limits.
  • Strict sampling protocols for rinsing and sealing bottles
  • All probes calibrated daily
  • Samples immediately acidified
  • pH probe calibrated immediately prior to titration
  • Supplemented and/or corrected using reservoir field pH measurements
  • Supplemented by charge balance (separate sample measurements of cation and anion concentrations)
4
  • Mini-separator has some leakage in capturing gas-liquid phase fractions, but issues are correctable and identifiable.
  • All probes calibrated at least once / week during field work.
  • All probes operating within detection limits for majority of sample locations.
  • Sampling protocols for rinsing and sealing bottles, implemented with some variation between researchers.
  • All probes calibrated at least once / week.
  • All probes operating within detection limits for majority of samples.
  • Samples titrated within 24 hours
  • pH probe calibrated immediately prior to titration
  • Supplemented by charge balance (separate sample measurements of cation and anion concentrations) for selected locations
3
  • Gas-water mini-separator does not always completely separate.
  • Temperature, conductivity, and pH probes used at top end of recommended operating temperatures
  • No known or regularly scheduled calibration schedule.
  • Probe detection limits are not sensitive to majority of sample chemistries.
  • No set sampling protocols for rinsing and sealing bottles specific to methods.
  • No known or regularly scheduled calibration schedule.
  • Probe detection limits are not sensitive to majority of sample chemistries.
  • Samples titrated at some point after 24 hours
  • pH probe not calibrated immediately prior to titration
  • No additional supporting data
2
  • Results taken from previous third-party studies of the area (either literature or contractors) with little or limited information on survey methods, replication, or error.
1
  • Assumed from studies of analogous geothermal settings, or extrapolated from studies of nearby areas.