In situ sampling and characterization of Callovo-Oxfordian pore water
The geochemical composition of pore water is one of the elements required for characterizing the confining properties of the Callovo-Oxfordian argillaceous formation. For this purpose, an innovative device for sampling of the pore water has been implemented in the Andra URL. A vertical ascending borehole was drydrilled, using N2 gas only and aseptic tools to avoid rock oxidation and microbiological perturbation. Equipment with a 5 meter long test interval at its far end was installed, and an Ar gas circulation was established. After a few weeks, due to the hydraulic gradient between the test interval and the rock formation, the water flows freely at a rate of 0.5 to 1.3 liters per month in the borehole and it is sampled. Collected water samples show a very low level of chemical perturbation. The chemical composition of this water is close to a theoretical composition deduced from core analyses and thermodynamic modelling.
A.Vinsot J.Delay
Andra, Laboratoire de recherche souterrain de Meuse/Haute-Marne, Bure, France
国际会议
第十二届水-岩相互作用国际研讨会(P0roceedings of the 12th International Symposium on Water-Rock Interaction)
昆明
英文
663-666
2007-07-31（万方平台首次上网日期，不代表论文的发表时间）