The development of the eastern Orpheus rift basin, offshore eastern Canada: A case study of the interplay between rift-related faulting and salt deposition and flow

Hanafi, Bari R.; Withjack, Martha Oliver; Durcanin, Michael A.; Schlische, Roy W.

doi:10.1016/j.marpetgeo.2022.105629

Cited by 5 publications

(1 citation statement)

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“…In some cases, the ability to distinguish the internal deformation of an evaporite sequence is limited by the quality of the available seismic data, with halite-dominated | 1653 EAGE evaporitic sequences often described as having a chaotic or transparent appearance (e.g. Hanafi et al, 2022;Jones & Davison, 2014). However, improvements in the seismic processing of evaporite sequences are leading to coherent reflectivity within these formations, potentially leading to an evolution in the interpretation of evaporite sequences' internal structural heterogeneity.…”

Section: Introductionmentioning

confidence: 99%

Characterising the internal structural complexity of the Southern North Sea Zechstein Supergroup Evaporites

2023

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The internal structure and architecture of evaporite sequences is often overlooked, with attention frequently concentrating on the external geometries that salt bodies form. The availability of extensive 3D seismic data affords the opportunity to interpret the internal structures within these evaporite sequences and comprehensively characterise the different structural facies over large areas. This paper concentrates on the Zechstein Supergroup evaporite deposits within the Southern North Sea of the United Kingdom's Continental Shelf. This analysis of the internal structural complexity and stratigraphic heterogeneity utilises 26,000 km2 of 3D seismic data together with over 96 wells from the Southern North Sea. Characterisation of the different structural facies present was undertaken alongside mapping their spatial distribution to understand the relationship they have with one another and the structural evolution that may have been taken. This work has (1) characterised and mapped six different internal structural facies present within the Zechstein with increasing levels of deformation; (2) shown the internal lithological heterogeneity is indicative of variations in the vertical strength profile of layered evaporite sequences; (3) discontinuous high‐amplitude reflections within the Zechstein are as a result of the geometries being too steeply dipping for the seismic data to image; and (4) the ability to possibly predict the internal heterogeneity of areas of poorly imaged salt, such as within large diapiric salt structures, from surrounding structural facies. These findings suggest that there is significant internal complexity even within areas of the basin with minor mobilisation to the external salt geometry.

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Section: Introductionmentioning

confidence: 99%