Gas Flow Through Water-Saturated Shear Zones: Field and Laboratory Experiments and Their Interpretation

Autor: R. Senger, E. Wyss, J. Croisé, U. Fischer, P. Marschall
Rok vydání: 1997
Předmět:
Zdroj: MRS Proceedings. 506
ISSN: 1946-4274
0272-9172
DOI: 10.1557/proc-506-741
Popis: Gas threshold pressure tests and gas tracer tests have been performed at the Grimsel Test Site to study two-phase flow processes in a shear zone. In addition, capillary pressure and gas permeability measurements were carried out in the laboratory on drillcore samples. The laboratory investigations were complemented by assessing the pore structure of the shear zone material. The interpretation of the field tests with numerical models indicated that the structural and two-phase flow parameters to be determined are highly correlated with one another and, consequently, the parameter estimates can be rather uncertain. The joint interpretation of field and laboratory results, however, led to a more stringent description of the two-phase flow processes, expressed by a better overall fit of the test data and smaller uncertainty ranges of the estimated parameters. The results showed that the gas mobility in the shear zone was very high even at high water saturation and gas flow was limited to the narrow zones of brittle deformation along the shear zone.
Databáze: OpenAIRE
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