FN Archimer Export Format
PT J
TI Seismic stratigraphy and depositional architecture of Neogene intraslope basins, offshore western Niger Delta
BT 
AF Chima, Kelvin I.
   Do Couto, Damien
   Leroux, Estelle
   Gardin, Silvia
   Hoggmascall, Nick
   Rabineau, Marina
   Granjeon, Didier
   Gorini, Christian
AS 1:1,2;2:1;3:3;4:4;5:5;6:6;7:7;8:1;
FF 1:;2:;3:PDG-REM-GM-LGS;4:;5:;6:;7:;8:;
C1 Sorbonne Université-ISTeP UMR 7193, Paris, France
   Alex Ekwueme Federal University, Ndufu-Alike Ikwo, Ebonyi State, Nigeria
   IFREMER, ZI Pointe du Diable, Plouzane, France
   Centre de Recherche en paléontologie Paris, UMR 7207, France
   Shell Petroleum Development Company, Lagos, Nigeria
   CNRS, UMR 6538, LGO (CNRS/UBO/UBS), Plouzane, France
   IFPEN, Rueil-Malmaison, France
C2 UNIV PARIS 06, FRANCE
   UNIV FED ALEX EKWUEME, NIGERIA
   IFREMER, FRANCE
   UNIV PARIS 06, FRANCE
   SHELL, NIGERIA
   CNRS, FRANCE
   IFPEN, FRANCE
SI BREST
SE PDG-REM-GM-LGS
UM LGO
IN WOS Ifremer UPR
   copubli-france
   copubli-univ-france
   copubli-int-hors-europe
   copubli-sud
IF 3.79
TC 17
UR https://archimer.ifremer.fr/doc/00503/61492/65302.pdf
LA English
DT Article
DE ;West Africa;Niger Delta;Seismic sequence stratigraphy;Filled ponded basins;Mass-transport deposits;Turbidite systems;Chronostratigraphy
AB Located on a divergent margin dominated by gravity tectonics above overpressured marine shales, the Niger Delta slope has been described as having a stepped profile characterized by ‘filled ponded basins’ that are prone to erosion and sediment bypass. Previous studies based on 3D seismic data have described the depositional architecture of the western Niger Delta's upper slope, but calibration of the seismic facies is lacking and the timing of major changes in sedimentary record remains elusive. In this study, seismic sequence-stratigraphy, 3D geomorphological analyses of high-resolution 3D seismic data, and bio/chronostratigraphic analyses from four boreholes, enabled the identification and characterization of the depositional architecture in Neogene ‘filled ponded basins’. Seven major seismic units were dated as Chattian, Burdigalian, Serravallian, Tortonian, Middle Pliocene and Middle Pleistocene to the present day. Major changes in the sedimentary record occurred in the Plio-Pleistocene, with the onset of erosive channel levee systems (CLSs) and mass-transport deposits (MTDs) generally capped by a hemipelagic drape. Amalgamated CLSs characterize the Tortonian-Late Miocene while erosive MTDs and CLSs characterize the Plio-Pleistocene units. Thick, laterally extensive MTDs are associated with regional slope instability, while active mobile shale triggered local spatially confined MTDs. Submarine channels evolved from moderate to highly sinuous. The degree of channel confinement generally decreases downstream where they are characterized by abandoned meander loops and avulsion resulting from levee breaching. Channel fills and levees/overbank deposits topped by hemipelagic drapes provide effective reservoir/seal (traps) for hydrocarbons. The alternation of channel deposits and hemipelagic layers indicate that eustasy controlled depositional patterns at a regional scale, while the spatio-temporal switches in submarine channel courses show that shale tectonics locally controlled deposition in intraslope basins. 
PY 2019
PD NOV
SO Marine And Petroleum Geology
SN 0264-8172
PU Elsevier BV
VL 109
UT 000490044500031
BP 449
EP 468
DI 10.1016/j.marpetgeo.2019.06.030
ID 61492
ER

EF