HYDRO-MECHANICAL BEHAVIOUR OF SATURATED-UNSATURATED CLAY MATERIALS-EXPERIMENTAL AND NUMERICAL INVESTIGATIONS OF GAS MIGRATION
In dense clay-rich materials, the gas entry pressure depending on permeability/porosity, water saturation, and pore water pressure, plays an important role concerning gas migration processes. A two-phase-flow code including a swelling model (Rock Flow) was used to interpret the measured data. Experimental evidences in situ and numerical interpretation results indicate that the measured permeability is depending on pressure and time (gas saturation). In an area with high permeability, the measured permeability at high gas injection pressure (1 MPa) is half an order of magnitude higher than that under a low injection pressure (0.2 MPa). This may be explained by a change of the apertures of the micro-fissures or the pores affected by the injection pressure. In the area with low permeability, the permeability calculated by a one-phase-flow model is about one order of magnitude lower than that by using a two-phase flow-model. The latter takes the gas saturation and the gas entry pressure into consideration.
H.Shao T.Nowak Ch.Lege H.Kunz V.Brauer
Federal Institute for Geosciences and Natural Resources (BGR) Stilleweg 2, D-30655 Hanover, Germany
国际会议
南京
英文
312-321
2006-05-22（万方平台首次上网日期，不代表论文的发表时间）