Fluid flow through marble; the relationship between permeability and pore fluid chemical saturation. Annual report. Appendix A
Fluid flow experiments have been conducted on split cylindrical samples of Vermont marble using distilled water as the pore fluid. The permeability and pore fluid chemical composition were monitored over time. The equilibrium saturation of Calcite and high Mg calcite in distilled water, initial P/sub CO/sub 2// = 10/sup -3.5/ and pH = 5.6, at 60 MPa is calculated and compared with the experimental results. Permeability and chemical composition data indicate that a distinction can be made between the first run after surface polishing and successive runs without additional surface preparation. Samples run immediately following surface polishing reach steady state permeability values at the same time they reach steady state chemical concentrations, about 48 hours after initial loading. The steady state chemical concentrations are super-saturated for the system at 25 C and 60 MPa. Experiments run without surface preparation show steady state chemical concentrations which are lower and initial concentrations which are the same or higher than those for experiments run just after surface preparation. Permeability changes for experiments without surface preparation are a factor of 10 or more lower than for experiments just after surface preparation. The permeability and chemical response of the system also show a dependence on whether the sample has experienced initial loading from 0 to 60 MPa. 11 refs., 7 figs.
- Research Organization:
- Columbia Univ., Palisades, NY (USA). Lamont-Doherty Geological Observatory
- DOE Contract Number:
- AC02-76ER04054
- OSTI ID:
- 6338054
- Report Number(s):
- DOE/ER/04054-T2; ON: DE86003831
- Country of Publication:
- United States
- Language:
- English
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