Fig. 6

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Reservoir “Dalle Nacrée”: Variations of velocity and acoustic impedance explain POROSITY variations on Sonic log (a), 2D seismic profile (b) and 3D vibro-seismic horizon slice (c), Variations of POROSITY on an inverted seismic section (d) – PICOREF project made in 1991–1993 by DHYCA to promote oil exploration in the Paris Basin [4].