DOI: 10.1306/01051009080
Scopus记录号: 2-s2.0-77957799244
论文题名: New insights into deformation mechanisms in the gravitationally driven Niger Delta deep-water fold and thrust belt
作者: Maloney D. ; Davies R. ; Imber J. ; Higgins S. ; King S.
刊名: AAPG Bulletin
ISSN: 0149-1911
EISSN: 1558-9641
出版年: 2010
发表日期: 2010
卷: 94, 期: 9 起始页码: 1401
结束页码: 1424
语种: 英语
Scopus关键词: Accommodation space
; Basal detachment
; Brittle process
; Deepwater
; Deformation mechanism
; Fold-and-thrust belts
; Niger Delta
; Seismic reflection data
; Synform
; Three-dimensional seismic reflection data
; Thrust faulting
; Sedimentology
; Seismic waves
; Seismology
; Shale
; Shear strength
; Tectonics
; Deformation
; brittle deformation
; data set
; deep water
; deformation mechanism
; displacement
; folding
; gravity field
; liquefaction
; sedimentary rock
; seismic reflection
; shale
; shear strength
; tectonics
; three-dimensional modeling
; thrust fault
; Niger Delta
; Nigeria
Scopus学科分类: Energy
; Earth and Planetary Sciences
英文摘要: We use two-and three-dimensional seismic reflection data from the deep-water Niger Delta fold and thrust belt to document evidence for two, discrete, postfaulting deformation mechanisms. An early phase of thrust-propagation folding is followed by folding caused by thickness changes within the basal shale detachment unit. The later phase of folding is caused by a lateral redistribution of the strata within the basal detachment unit. This example of late deformation occurred over a 4-5-m.y. period as a result of the displacement of approximately 590 km3 (∼370 mi3) of the underlying strata within the detachment unit. In another deformation event in the basal detachment unit, about 160 km3 (∼100 mi3) moved, laterally creating a synform in the overburden and parallel on-lap fill, indicative of the relatively rapid creation of accommodation space. On the basis of seismic reflection data from the delta and a consideration of the volumes and rates of movement of sedimentary rock, we conclude that the poorly imaged succession commonly referred to as mobile shale cannot deform solely by ductile mechanisms as interpretations of shale tectonic provinces have commonly suggested but instead by brittle processes that involve thickening by thrust faulting and sub-seismic accommodation structures. Processes such as liquefaction, where a complete loss of shear strength is observed, had a minimal function. Therefore, the term "mobile shale" in this setting is widely exaggerated. An awareness of postfaulting deformation mechanisms will be important for the successful exploration of gravitationally driven fold and thrust belts. Copyright © 2010. The American Association of Petroleum Geologists. All rights reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-77957799244&doi=10.1306%2f01051009080&partnerID=40&md5=1525d8c960c21cc7e1fcf306e3b2151d
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/13480
Appears in Collections: 过去全球变化的重建 影响、适应和脆弱性 科学计划与规划 气候变化与战略 全球变化的国际研究计划 气候减缓与适应 气候变化事实与影响
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Recommended Citation:
Maloney D.,Davies R.,Imber J.,et al. New insights into deformation mechanisms in the gravitationally driven Niger Delta deep-water fold and thrust belt[J]. AAPG Bulletin,2010-01-01,94(9)