Fluid Inclusion Analysis At Coso Geothermal Area (2004)

GEOTHERMAL ENERGY

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Exploration Activity: Fluid Inclusion Analysis At Coso Geothermal Area (2004)

Exploration Activity Details
Location	Coso Geothermal Area
Exploration Technique	Fluid Inclusion Analysis
Activity Date	2004
Usefulness	not indicated
DOE-funding	Unknown

Exploration Basis

1) To determine if analyses of fluid propene and propane species in fluid inclusions can be used to interpret fluid type, history, or process. 2) To evaluate the geology and thermal history of the East Flank, in order to better understand how the rocks will behave during hydro-fracturing.

Notes

1) Analyses were performed on drill cuttings at 20ft intervals from four Coso geothermal wells. Two wells are good producers, one has cold-water entrants in the production zone, and the fourth is a non-producer. The ratios show distinct differences between producing and the non-producing wells. Propane dominate fluids are associated with cool water entrants. 2) Fluid inclusion studies were implemented to separate different thermal events. Fluid inclusions were studied from three wells: 83-16, 38B-9, and core hole 64-16. Inclusions from calcite, quartz, feldspar, and epidote were studied. Quartz- and calcite-hosted inclusions from the upper 256m in 64-16 are characterized by salinities usually less than approximately 2 weight % NaCl equivalent and homogenization temperatures that differ by less than ~15 ⁰C from the down hole measurements.

References

Norman, D.I.; Dilley, L.; Moore, J.N.; Berard, B. (1 January 2004) GEOTHERMAL FLUID PROPENE AND PROPANE: INDICATORS OF FLUID

Kovac, K.M.; Moore, J.; McCulloch, J.; Ekart, D. (1 January 2004) GEOLOGY AND MINERAL PARAGENESIS STUDY WITHIN THE COSO-EGS PROJECT

Additional References