3D seismic interpretation of slump complexes: examples from the continental margin of Israel

Basin Research - Tập 17 Số 1 - Trang 83-108 - 2005
Jose Frey Martinez1, Joe Cartwright1, Ben Hall2
13DLab, School of Earth, Ocean and Planetary Sciences, Cardiff University, Cardiff, UK
2BG-Group, Thames Valley Park Drive, Reading, UK

Tóm tắt

AbstractThis paper uses three‐dimensional (3D) seismic data from the continental margin of Israel (Eastern Mediterranean) to describe a series of slump deposits within the Pliocene and Holocene succession. These slumps are linked to the dynamics of subsidence and deformation of the transform margin of the eastern Mediterranean. Repeated slope failure occurred during the post‐Messinian, when a clay‐dominated progradational succession was forming. This resulted in large‐scale slump deposits accumulating in the mid‐lower slope region of the basin at different stratigraphic levels. It is probable that the slumps were triggered by a combination of slope oversteepening, seismic activity and gas migration.The high spatial resolution provided by the 3D seismic data has been used to define a spectrum of internal and external geometries within slump deposits. Importantly, we recognise two main zones for many of the slumps on this margin: a depletion zone and an accumulation zone. The former is characterised by extension and translation, and the latter by complex imbricate thrusts and fold systems. Volume‐based seismic attribute analysis reveals transport directions within the slump deposits, which are predominately downslope, but with subtle variations particularly at the lateral margins. Basal shear surfaces are observed to ramp both up and down stratigraphy. Slump evolution occurs both by retrogressive upslope failure, and by downslope propagation (out‐of‐sequence) failure. Slump anatomy and the combination of factors responsible for slump failure and transport are relatively poorly understood, mainly because of the limited 3D of outcrop control; hence, this subsurface study is an example of how improved understanding of the mechanisms and products can be obtained using this 3D seismic methodology in unstable margin areas.

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Basin Research

Tập 17 Số 1

83-108

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