The role of deformation in controlling depositional patterns in the south-central Niger Delta, West Africa

Hooper, Robert J.; Fitzsimmons, Roy; Grant, Neil; Vendeville, Bruno C.

doi:10.1016/s0191-8141(01)00122-5

Cited by 100 publications

(55 citation statements)

References 15 publications

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“…Bornhauser, 1959;Edwards, 1976;Thornburg et al, 1990;Ravnas and Steel, 1997;Morris et al, 1998;Soreghan et al, 1999;Anderson et al, 2000;Hodgetts et al, 2001;Hooper et al, 2002;Shaw et al, 2003). This means that fault-generated topographies occur at the depositional surface, and that the fill-to-the-top assumption may not always be valid.…”

Section: Introductionmentioning

confidence: 99%

Using T–Z plots as a graphical method to infer lithological variations from growth strata

Castelltort

Pochat

Driessche

2004

Journal of Structural Geology

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The 'T-Z plot' method consists of plotting the throw of sedimentary horizons across a growth fault versus their depth in the hanging wall. This method has been initially developed for the analysis of growth fault kinematics from seismic data. A brief analytical examination of such plots shows that they can also provide valuable information about the evolution of fault topography. When growth is a continuous process, stages of topography creation (fault scarp) and filling (of the space available in the hanging-wall) are related to non-dynamic (draping, mud-prone pelagic settling) and dynamic (sand-prone, dynamically deposited) sedimentation, respectively. In this case, the T -Z plot analysis becomes a powerful tool to predict major lithological variations on seismic profiles in faulted settings. q

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Section: Introductionmentioning

confidence: 99%

Using T–Z plots as a graphical method to infer lithological variations from growth strata

Castelltort

Pochat

Driessche

2004

Journal of Structural Geology

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“…No entanto, estudos sobre a modalidade de tectônica gravitacional envolvendo níveis superpressurizados ainda permanecem relativamente pouco numerosos (e.g. Bruce, 1973;Guimarães et al, 1989;Caldeira et al, 1991;Cohen & McClay, 1996;Morley & Guerin, 1996;Silva et al, 1999;Zalán, 1999;Wu & Bally, 2000;Hooper et al, 2002;Rensbergen et al, 2003;Vendeville & Gaullier, 2003;Rowan et al, 2004;Cobbold et al, 2004;Oliveira, 2005;Zalán, 2005;Mourgues & Cobbold, 2006a, b;Sultan et al, 2007;Lecomte & Vendeville, 2008). Na Bacia da Foz do Amazonas, a literatura científica faz referênciasà ocorrência de feições deformacionais decorrentes de tectônica gravitacional induzida por um nível basal móvel constituído por argilas superpressurizadas (shale tectonics ), que deforma as seqüências sedimentares marinhas da bacia, incluindo o Leque Submarino do Amazonas (Guimarães et al, 1989;Silva & Rodarte, 1989;Silva et al, 1999;Zalán, 1999;Cobbold et al, 2004;Oliveira, 2005).…”

Section: Introductionunclassified

O processo de colapso gravitacional da seção marinha da bacia da foz do Amazonas - margem equatorial brasileira

Perovano¹,

Reis²,

Silva³

et al. 2009

Rev. Bras. Geof.

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ABSTRACT. Gravitational deformation affects the entire marine sequences of the Foz do Amazonas basin, including the sedimentary successions of the Amazon Fan.Associated gravity-driven structures, imaged by 2D multichannel seismic profiles, were driven by gravity in a linked extensional-contractional system gliding on weak levels, and driven by sedimentary loading and by the bathymetric slope. Sliding of the sedimentary section took place along distinct décollement surfaces and, apparently, at different stages of the margin's evolution. At least three main stratigraphic levels have acted as décollement surfaces, at either regional or local scale. Gravity-driven deep-water fold-and-thrust belts stand as the most remarkable structures along the margin. Their geometry and structural complexity vary along strike, owing to lateral changes in the development of the Amazon fan's depocenters. These structures are significantly more complex along the Northwestern Compartment, where the major margin's depocenters are located, exhibiting evidence of long-lasting deformation from multiple partially-overlapping fronts. In the South-eastern Compartment, the system is restricted to a pair of active reverse faults causing no major sea-bottom relief (inactivated belt). At local scale, antithetic normal growth faults detach on an upper décollement level and exert structural control on the segmentation of the fan's depocenters.Keywords: gravity tectonics, gravitational fold-and-thrust belts, Amazon Deep-sea Fan, Brazilian equatorial margin. RESUMO.As seqüências marinhas da Bacia Foz do Amazonas são deformadas pela tectônica gravitacional, incluindo aquelas do Leque do Amazonas. As estruturas associadas ao colapso gravitacional, imageadas por sísmica multicanal 2D, foram formadas pelo deslizamento gravitacional da cobertura sedimentar sobre níveis basais móveis, induzido pela sobrecarga sedimentar e pelo gradiente do talude. O deslizamento gravitacional ocorreu ao longo de distintas superfícies de descolamento e, aparentemente, em diferentes estágios evolutivos da margem. Ao menos três níveis estratigráficos principais atuaram como superfícies de descolamento, em escala regional ou local. Cinturões de dobramento e cavalgamento emáguas profundas são as estruturas mais notáveis deste arcabouço; sua geometria e complexidade variam ao longo da margem em repostaà variação lateral do desenvolvimento dos depocentros do Leque do Amazonas. Estas estruturas são mais complexas no Compartimento Noroeste onde os principais depocentros estão presentes, formando múltiplas frentes compressivas devido ao mais intenso encurtamento da cobertura sedimentar. No Compartimento Sudeste, o sistemaé menos desenvolvido e se limita a um cinturão parcialmente inativo, caracterizado apenas por um par de falhas reversas ativas com menor impacto morfológico. Localmente, falhas normais lístricas antitéticas se ancoram sobre a superfície de descolamento mais superior, exercendo um controle estrutural sobre a segmentação dos depocentros do próprio leque.Palavras-chav...

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“…The resulting succession of deltaic, inters lope and abyssal plain deposits has reached a thickness of approximately 12 km [1]. Deltaic growth faults and associated strata record the interaction between sedimentary processes and fault movements, and as such they are good for detailed studies of the interaction of tectonics and sedimentation [8][9][10][11][12]. Structure and depositional systems have migrated with the progradation of the delta through time.…”

Section: Introductionmentioning

confidence: 99%

Structural Deformation and Depositional Processes: Insights from the Greater Ughelli Depobelt, Niger Delta, Nigeria

Obiadi¹,

Cm²

2016

Oil Gas Res

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The growth and development of the structural and depositional systems in the hydrocarbon rich Niger Delta, off the Atlantic Coast of Nigeria, West Africa, involves a complex interaction of extension, contraction and subsidence such that at any given point in time up-dip extensional system are kinematically linked to down-dip contractional systems via a transitional zone. On the regional tectonostratigraphic zonation are local structural and depositional systems associated with individual extensional faults and thrust-cored folds, local subsidence and withdrawal associated with shale diapir growth. The research is a case study of growth faults and associated deltaic sedimentation in the Greater Ughelli Depobelt of the Niger Delta. Using 3D seismic, a range of well log suites and biostratigraphic data, a regional sequence stratigraphic framework of the study area was produced. Six Maximum Flooding Surfaces MFS's and five Sequence Boundaries SB's were defined within the confines of available data. With the aid of these regional horizons/markers (MFSs and SBs) and events pattern in the seismic volume, a structural interpretation model and framework for the study area was also undertaken. Structural analysis show that fault activity began well before 31.3 Ma and continued beyond 20.7 Ma, and has greatly influenced the creation of accommodation space and sediment accumulation. Generally, due to structural deformation and structurally induced accommodation creation, stratigraphic thickness is observed to have increased in the basin ward direction, and at different stages in the structural evolution of the study area, 'local depocenter' have migrated to the NW (29.3 Ma-22.2 Ma) and then to the SE (22.2 Ma-20.7 Ma) resulting also in lateral changes in stratigraphic thicknesses in these directions.

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The role of deformation in controlling depositional patterns in the south-central Niger Delta, West Africa

Cited by 100 publications

References 15 publications

Using T–Z plots as a graphical method to infer lithological variations from growth strata

Using T–Z plots as a graphical method to infer lithological variations from growth strata

O processo de colapso gravitacional da seção marinha da bacia da foz do Amazonas - margem equatorial brasileira

Structural Deformation and Depositional Processes: Insights from the Greater Ughelli Depobelt, Niger Delta, Nigeria

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