(19)

(11)

EP 3 304 136 A1

(12)

(43) Date of publication: 11.04.2018 Bulletin 2018/15 (21) Application number: 16736614.5 (22) Date of filing: 01.06.2016

(51) International Patent Classification (IPC):  G01V 1/38(2006.01) G01V 13/00(2006.01) (86) International application number: PCT/IB2016/000934 (87) International publication number: WO 2016/193825 (08.12.2016 Gazette 2016/49)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: MA MD (30) Priority: 02.06.2015 US 201562169599 P (71) Applicant: CGG Services SAS 91300 Massy (FR)	(72) Inventors: NI, Yuan 91300 Massy (FR) PAYEN, Thierry 91300 Massy (FR) (74) Representative: Petit, Maxime  Ipsilon Le Centralis 63, avenue du Général Leclerc 92340 Bourg-la-Reine 92340 Bourg-la-Reine (FR)