** Shares of CGG GEPH.PA plunge 19%, and on track for
their worst day since Nov. 3
** Q2 performance from its late sales business was below
expectations, says an analyst, who added the performance puts
co's cash-flow guidance in doubt
** "In late sales... clearly dynamic is not there," says a
Paris-based analyst, adding that the unit is normally a "cash
cow"
** The analyst adds that FCF guidance is now in doubt
** "It is more and more challenging for them to reach this
target in terms of net free cash flow neutral for the full-year"
** CGG said in a statement on Thursday it was confident in
achieving its 2023 targets
(Reporting by Olivier Sorgho)
((Olivier.Sorgho@thomsonreuters.com))