Permeability and alteration within the Soultz granite inferred from geophysical and flow log analysis

The 1993 stimulation tests carried out in well GPK1 at Soultz, Alsace, France, showed that out of the thousands of fractures cross-cutting the granite, only a limited number of natural fractures contributed to fluid flow. A comparison between the petrophysical properties of the rock and the interpre...

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Bibliographic Details
Published in:Geothermics 2006-10, Vol.35 (5), p.544-560
Main Authors: Sausse, Judith, Fourar, Mostafa, Genter, Albert
Format: Article
Language:English
Subjects:
Alteration
Engineering Sciences
France
Gamma-ray spectral
Granite
Logging
Permeability
Soultz-sous-Forêts
Statistics
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Summary:The 1993 stimulation tests carried out in well GPK1 at Soultz, Alsace, France, showed that out of the thousands of fractures cross-cutting the granite, only a limited number of natural fractures contributed to fluid flow. A comparison between the petrophysical properties of the rock and the interpretation of the hydraulic test results is proposed as a means of determining the distribution of the natural permeable fractures. Gamma-ray spectral logs and other geophysical logs (caliper, bulk density, P-wave slowness, and photoelectric factor) revealed some petrographical variations within the Soultz massive granite, as well as altered/fractured zones that act as preferential pathways for fluid flow as indicated by flow logs. Fluid losses during circulation tests have been estimated on the basis of statistical analysis of gamma-ray readings, and of potassium and thorium contents.
ISSN:0375-6505
1879-3576
DOI:10.1016/j.geothermics.2006.07.003