Types of fluid-related features controlled by sedimentary cycles and fault network in deepwater Nigeria
| Autor: | T. Marsset, L. Ruffine, A. Gay, S. Ker, E. Cauquil |
|---|---|
| Přispěvatelé: | Unité de recherche Géosciences Marines (Ifremer) (GM), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Géosciences Montpellier, Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Université des Antilles (UA)-Centre National de la Recherche Scientifique (CNRS), Total E&P |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
010504 meteorology & atmospheric sciences
Lineament [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] Stratigraphy Methane-derived carbonate Clathrate hydrate Sedimentary cycles Fault (geology) Fault network 010502 geochemistry & geophysics Oceanography 01 natural sciences chemistry.chemical_compound Petrology Geomorphology 0105 earth and related environmental sciences geography geography.geographical_feature_category Continental shelf Pockmark Geology 15. Life on land Turbidite Geophysics chemistry Fluid flow Carbonate Economic Geology Sedimentary rock Niger delta Gas hydrates |
| Zdroj: | Marine and Petroleum Geology Marine and Petroleum Geology, Elsevier, 2018, 89, pp.330-349. ⟨10.1016/j.marpetgeo.2017.10.004⟩ Marine And Petroleum Geology (0264-8172) (Elsevier Sci Ltd), 2018-01, Vol. 89, N. Part.2, P. 330-349 |
| ISSN: | 0264-8172 |
| Popis: | The seismic characteristics of focused fluid-related features such as pockmarks and carbonate build-ups on the Nigerian continental slope have been investigated using complementary seismic data sets (reprocessed 3D exploration data and 2D Very High Resolution hull-mounted and near-bottom seismic data) coupled with the results of previous studies (sedimentological, geotechnical and geochemical analyses). The results show different types of fluid-related features within the hemipelagic phase of long duration (∼1 Myr) Turbidite/Hemipelagic cycles. They are the product of the disturbance of the hosting sediments following two main distinct processes: (1) no or low sediment deposition caused by fluid escape associated with seafloor settlement (benthic fauna, carbonate precipitation, gas hydrate formation) and (2) post-depositional erosion, caused either by fluid release (dewatering from underlying features such as channels and upward migration from a deep source) or by collapse (destabilisation of gas hydrates). The temporal evolution reveals a decrease in fluid flow during the hemipelagic deposition as witnessed by the decrease in methanogenic activity and by gas hydrate destabilisation. The spatial distribution of fluid-related features seems to be controlled by the type of fault (small fault or structural lineament). |
| Databáze: | OpenAIRE |
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