geothermal_fluidinclusions_wells

analysis of continuous fluid inclusion - gas analysis data from geothermal wells

COSO Fluid Inclusion Gas Analysis

Source files are located at gdr.openei.org

Hosted data

These are files worth looking at in the data folder:

• raw_collated.csv is a combined csv of all the samples downloaded from the above link. This is useful if you want to do anything with all of the sampled fluid inclusions, as from source.
• cleaned_types.csv is a cleaned version of raw_collated.csv. This corrects some missing and incorrect data.
• located_wells.csv has the latitude and longitude of a portion of the wells associated. This will be of use if you want to do any analysis involving geospatial distributions and such. It covers has 6896 of the 9712 rows present in raw_collated, and uses that as a base.
• fi_wells.gpkg is a geopackage version of located_wells.csv rebuilt using cleaned_types.csv. This should be droppable into whichever GIS software you favour. It is also possible to build a shapefile version, but it will truncate the column headers.
• well_locations.gpkg is a geopackage of the wells present in the Coso field. There are more of these than fi_wells.gpkg, but many of these do not have fluid inclusion data associated with them.

Reference: Fluid Stratigraphy and Permeable Zones of the Coso Geothermal Reservoir. Dilley, L. M., Norman, D.I., Moore, J., and McCulloch, J. Geothermal Resource Council Transactions, Vol. 30. 2006

Fluid inclusions gaseous species in drill cuttings by mass spectrometry analyses

• N2 = AMU28
• Ar = AMU40
• CO2 = AMU44
• CH4 = AMU16
• propane = AMU43
• propene = AMU39

Reservoir fluids

• N2/Ar (mass 28/mass 40) > 200
• CO2/CH4 (mass 44/mass 16) > 4,
• R1 = (N2/Ar (mass 28/mass 40)+ CO2/CH4)/(propane/propene (mass 43/mass 39))
• R2 = (N2/Ar (mass 28/mass 40)+ CO2/N2 (mass 44/mass 28))

Shallow Meteoric Fluids

N2/Ar < 200, CO2/CH4 < 4, propane/propene >1, 1/R1 > 0.5

Permeable zones

Relative change in the CO2/N2

References

A reference to the process undertaken: link

Identifying fractures types: link

Natural fracture dataset for some wells: link

Mud logs for some wells: link

Mass spectrometry: link