Ichnofabric Mapping and Interpretation of Jurassic Reservoir Rocks of the Norwegian North Sea

Bockelie, Johan Fredrik

doi:10.2307/3514902

Cited by 41 publications

(19 citation statements)

References 4 publications

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“…Given the need of the oil and gas industry for improved reservoir characterisation, the ichnofabric concept has been developed over the last 20 years in close association between academics and industry (Bromley and Ekdale, 1986;Bockelie, 1991). An ichnofabric includes all aspects of the texture and internal structure of a sedimentary unit that result from bioturbation at all scales (Bromley and Ekdale, 1986).…”

Section: Methodsmentioning

confidence: 99%

Characterisation of a Campanian deep-sea fan system in the Norwegian Sea by means of ichnofabrics

Knaust

2009

Marine and Petroleum Geology

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Section: Methodsmentioning

confidence: 99%

Characterisation of a Campanian deep-sea fan system in the Norwegian Sea by means of ichnofabrics

Knaust

2009

Marine and Petroleum Geology

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“…Using ichnological data in core-based studies Among ichnologists working with the petroleum industry, two main approaches have been used in core-based studies, one based on an updated version of the ichnofacies concept of Seilacher (1964) (see Frey et al 1990, andrecent reviews by McIlroy 2004a;MacEachern et al 2005) and the second based upon the creation of ichnofabric schemes on a case-by-case basis (e.g. Bockelie 1991;Taylor & Goldring 1993;McIlroy 2004a). Spatially complex ichnofabric models have been created, either deterministically (e.g.…”

Section: Naming Ichnofabricsmentioning

confidence: 99%

“…Spatially complex ichnofabric models have been created, either deterministically (e.g. Bockelie 1991) or conceptually, through integration of sedimentary facies and the facies models that arise from them with ichnofabric studies (e.g. Goldring et al 1991;Martin & Pollard 1996;McIlroy 2004b).…”

Section: Naming Ichnofabricsmentioning

confidence: 99%

Lateral variability in shallow marine ichnofabrics: implications for the ichnofabric analysis method

McIlroy

2007

JGS

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Ichnological analysis, commonly undertaken both in the field and in core studies, is generally carried out in vertical logged successions. This work documents the results of a detailed ichnofabric study of two highly bioturbated sandstone beds separated by a mudstone, within the thick, Lower Jurassic succession of the Yorkshire coast, UK. The two sandstone beds contain relicts of hummocky cross-stratification and rare bioclasts of bivalves and belemnites. Bioturbation of the beds is intense and the diversity of trace fossils is considerable. Trace fossils present include Teichichnus rectus , Teichichnus isp. A, Thalassinoides isp., Palaeophycus heberti , Diplocraterion parallelum , Rhizocorallium , Rosselia socialis , Schaubcylindrichnus isp., Chondrites isp., Planolites isp. and Phycosiphon incertum . Ichnofabrics were studied at 5 m intervals parallel to the modern cliff-line, which is parallel to the inferred Jurassic palaeo-coastline. The results demonstrate that there is considerable patchiness to ichnofabric even in a comparatively simple depositional setting such as a storm-influenced shelf. This observation is in line with studies of the modern sea floor. The implications of patchiness in ichnofabric are broad-ranging, but most importantly suggest that caution is needed in the use of ichnofabric analysis for intra-regional correlations.

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“…The contribution of ichnology in studies of marine siliciclastic deposits is particularly welldocumented. Ichnofossils have been used at various levels to distinguish the various lithofacies that develop along or within foreshore-tooffshore transects (e.g., Easthouse and Driese, 1988;Bockelie, 1991;MacEachern et al, 1992;Pemberton et al, 1992a). Similarly, the utility of ichnology in recognizing marginal-marine, brackish-water faciès has been demonstrated (e.g., Pemberton and Wightman, 1992).…”

Section: Introductionmentioning

confidence: 98%

Ichnofabrics, ichnocoenoses, and ichnofacies implications of an upper cretaceous tidal‐inlet sequence (Eutaw formation, central Alabama)

Savrda

Locklair

Hall

et al. 1998

Ichnos

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A siliciclastic tidal-inlet sequence within the Tombigbee Sand Member of the Upper Cretaceous Eutaw Formation, central Alabama, is composed of two subfacies distinguished primarily on the basis of form, scale, and orientation of cross-stratification. These subfacies record spatial and temporal variations in net-sedimentation rate, frequency of reworking, and relative importance of slack-water stages, most of which were governed by variations in tidal-current asymmetries and associated hydrodynamic regimes. The dominant ichnocoenosis in both subfacies is characterized by, in general order of decreasing abundance: (1) Macaronichnus, produced by vagile, deep deposit-feeding polychaetes;(2) Conichnus, produced as temporary dwellings or during equilibrium/ escape movements of anemone-like animals; (3) a branched form of Skolithos, attributed to depositfeeding worms; and (4) Dactyloidites, a subsurface feeding structure made by worms or worm-like organisms. Relative abundances of these ichnotaxa, and degree of bioturbation in general, vary within and between subfacies, in a manner consistent with variations in reworking and net-sedimentation rates. Ophiomorpha defines a subordinate ichnocoenosis that developed only during relatively rare, extended slackwater periods associated with subfacies 2. Assignment of the dominant ichnocoenosis to the Skolithos ichnofacies, which usually typifies highenergy nearshore sands, is inappropriate. Bioturbation by sessile suspension-feeders was apparently limited or precluded altogether by persistently high energy and sedimentations rates, and, consequently, by narrow colonization windows. Instead, the tidal-inlet ichnocoenosis of the Eutaw, and analogous ichnocoenoses in comparable deposits, may be more appropriately assigned to the ill-defined Curvolithus ichnofacies or, alternatively, to a new environmentally restricted ichnofacies.

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Ichnofabric Mapping and Interpretation of Jurassic Reservoir Rocks of the Norwegian North Sea

Cited by 41 publications

References 4 publications

Characterisation of a Campanian deep-sea fan system in the Norwegian Sea by means of ichnofabrics

Characterisation of a Campanian deep-sea fan system in the Norwegian Sea by means of ichnofabrics

Lateral variability in shallow marine ichnofabrics: implications for the ichnofabric analysis method

Ichnofabrics, ichnocoenoses, and ichnofacies implications of an upper cretaceous tidal‐inlet sequence (Eutaw formation, central Alabama)

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