FN Archimer Export Format
PT J
TI Initiation of gas-hydrate pockmark in deep-water Nigeria: Geo-mechanical analysis and modelling
BT 
AF RIBOULOT, Vincent
   SULTAN, Nabil
   IMBERT, P.
   KER, Stephan
AS 1:1;2:1;3:2;4:1;
FF 1:PDG-REM-GM-LAD;2:PDG-REM-GM;3:;4:PDG-REM-GM-LAD;
C1 IFREMER, Inst CARNOT EDROME, Ctr Brest, Brest, France.
   TOTAL, Pau, France.
C2 IFREMER, FRANCE
   TOTAL, FRANCE
SI BREST
SE PDG-REM-GM-LAD
   PDG-REM-GM
IN WOS Ifremer jusqu'en 2018
   copubli-france
IF 4.409
TC 39
UR https://archimer.ifremer.fr/doc/00301/41215/40643.pdf
LA English
DT Article
CR ERIG 3D
BO Pourquoi pas ?
DE ;pockmarks;gas hydrates;VHR seismic data;piezocone;numerical modelling;Niger Delta
AB A review of recent literature shows that two geomorphologically different types of pockmarks, contribute to gas seepage at the seafloor. Type-1 pockmarks are defined as seafloor craters associated to fluid seepage and are the most classical type referred to as “pockmarks” in the literature. In contrast, Type-2 pockmarks reveal a complex seafloor morphology that may result from the formation/decomposition of gas hydrates in underlying sedimentary layers.  Interpretation of very-high-resolution seismic data, sedimentological analyses and geotechnical measurements acquired from the Eastern Niger Submarine Delta reveal that Type-2 pockmarks are associated to the presence at depth of a conical body of massive gas hydrates. Based on acquired data, theoretical analysis and numerical modelling, it was possible to propose a novel geo-mechanical mechanism controlling the irregular seafloor deformations associated to Type-2 pockmark and to show that pockmark shapes and sizes are directly linked to the initial growth and distribution of sub-seafloor gas hydrates. The study illustrates the role of gas hydrates formation in the fracturation, deformation of the subsurface sediment and the formation of Type-2 pockmarks.
PY 2016
PD JAN
SO Earth And Planetary Science Letters
SN 0012-821X
PU Elsevier Science Bv
VL 434
UT 000368870500024
BP 252
EP 263
DI 10.1016/j.epsl.2015.11.047
ID 41215
ER

EF