Acoustic Properties of High Porosity North Sea Chalk Measured during Compaction and Waterflooding at Field Stress

G022 ACOUSTIC PROPERTIES OF HIGH POROSITY NORTH SEA CHALK MEASURED DURING COMPACTION AND WATERFLOODING AT FIELD STRESS 1 M.G. STAGE 1 T.G. KRISTIANSEN 2 AND H.F. CHRISTENSEN 1 1 Danish Geotechnical Institute (GE0) Maglebjergvej 1 PO Box 1 DK-2800 Lyngby Chalk especially high porosity chalk has proven to have an enormous compaction potential when water substitutes oil in the pore space in contrast to what is observed for sandstone. The potential compaction energy is only released when the fluid substitution occurs at a stress level which is close to or beyond pore collapse stress for the relevant formation. Most laboratory