Interactive interpretation of a submarine fan, offshore Ireland: A case history

Macurda, Donald B.; Nelson, H. Roice

doi:10.1190/1.1439444

Cited by 3 publications

References 1 publication

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Early Tertiary submarine fan deposits in the Porcupine Basin, offshore Ireland

Shannon¹

1992

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The Porcupine Basin, offshore western Ireland, contains up to 10 km of Mesozoic and Cenozoic sediments. Seismic sequence analysis of the Palaeocene-Eocene strata on the southwestern and southeastern margins of the basin reveals a mounded and draped geometry. Four seismic sequences are defined and are coeval with a series of deltaic deposits in the northern and central parts of the basin. In the southwestern area these are interpreted as stacked submarine fan deposits. In the southeastern area the lower two sequences are interpreted as shelf-slope deposits which are overlain by two submarine fan complexes. Funnelling of the sediment was controlled by erosive channelling through interfan topographic lows. The seismic response indicates that the fans are dominated by lower fan sheet sand deposits with minor amounts of upper fan channellized sandstones. They probably developed in response to an interplay of eustatic sea level changes, tectonic uplift on the basin margins, and thermal subsidence towards the basin centre.

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Early Tertiary submarine fan deposits in the Porcupine Basin, offshore Ireland

Shannon¹

1992

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Using multi-attribute neural networks classification for seismic carbonate fades mapping: a workflow example from mid-Cretaceous Persian Gulf deposits

Baaske

Mutti

Baioni

et al. 2007

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Seismic facies mapping in large seismic surveys can be time consuming, even if only a basic overview of the facies distribution is needed. Therefore this study outlines an approach for the use of volume-based seismic attributes from 2D surveys for automated seismic facies mapping within carbonate settings. The study area is located in the central Persian Gulf, offshore Iran. The interval of interest is the mid-Cretaceous Sarvak Formation, which is part of the extensive Cretaceous shallow-water carbonate platform of the eastern Arabian Plate. A set of nine volume-based seismic attributes, calculated from time, amplitude and frequency information of post-stacked 2D seismic data, was chosen to characterize geological information within the interval of interest. The volume-based attributes were supplemented by two grid-based attributes to highlight structural elements. The geological significance of each attribute was evaluated by comparing it with results of seismic sedimentological/geomorphological studies. Furthermore, statistical methods were applied to highlight direct relationships amongst the attributes. The results of these tests were then used to choose a limited set of attributes for neural network-based multi-attribute classifications. The results show that seismic attributes derived from 2D surveys can be used to map basic seismic facies types in carbonate settings and that the outlined, general approach might be applied in other studies.

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Beyond curvature — volumetric estimates of reflector rotation and convergence

Marfurt

Rich

2010

SEG Technical Program Expanded Abstracts 2010

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While amplitude-based 'attributes' such as RMS amplitude, coherent energy, AVO, and impedance inversion are routinely used to identify lithology, porosity, and fluid product, geometric attributes such as coherence and curvature are more commonly used to map structural deformation and (coupled with principals of geomorphology) depositional environment. Geometric attributes are most effectively used by combining them with conventional seismic amplitude data using modern 3D visualization tools. Coherence often illuminates faults, collapse features, and channel edges, while curvature images folds and flexures, subseismic antithetic faults that appear as drag or folds adjacent to faults, diagenetically altered fractures, karst, and differential compaction over channels. In spite of the advantages, neither of these two attribute families provide much value in enhancing classic seismic stratigraphy analysis which was based primarily on stratigraphic terminations. Such workflows were one of the earliest implemented in 3D interpretation workstations and the subject of many short courses (e.g. Macurda and Nelson, 1988). In this paper, we reexamine some of the objectives of seismic stratigraphy and examine how we can better use our volumetric dip volumes to address them.

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Interactive interpretation of a submarine fan, offshore Ireland: A case history

Cited by 3 publications

References 1 publication

Early Tertiary submarine fan deposits in the Porcupine Basin, offshore Ireland

Early Tertiary submarine fan deposits in the Porcupine Basin, offshore Ireland

Using multi-attribute neural networks classification for seismic carbonate fades mapping: a workflow example from mid-Cretaceous Persian Gulf deposits

Beyond curvature — volumetric estimates of reflector rotation and convergence

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