The Ravenscar Group: A coeval analogue for the Middle Jurassic reservoirs of the North Sea and offshore Mid-Norway

Butler, N.; Charnock, Mike; Häger, Kjell O.; Watkins, Connor

doi:10.1144/tms001.4

Cited by 17 publications

(13 citation statements)

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“…This biostratigraphic evidence is consistent with the sequence stratigraphic scheme and biostratigraphic calibration of Partington et al (1993) and who assigned the Ness Formation to the Lower Bajocian, J24 ( pars) sequence. These findings, however, conflict with those of Butler et al (2005) who placed the Ness Formation within the late Aalenian, thus pre-dating the Gristhorpe Member. The palynological evidence for this is based on the absence of Early Bajocian marker species Sentusidinum granulatum and Durotrigia filapicata from the Ness Formation, together with the presence of Nannoceratopsis triceras which ranges no younger than earliest Bajocian (Butler et al 2005).…”

Section: Biostratigraphic Relationship Of the Gristhorpe Member And Ncontrasting

confidence: 83%

“…These findings, however, conflict with those of Butler et al (2005) who placed the Ness Formation within the late Aalenian, thus pre-dating the Gristhorpe Member. The palynological evidence for this is based on the absence of Early Bajocian marker species Sentusidinum granulatum and Durotrigia filapicata from the Ness Formation, together with the presence of Nannoceratopsis triceras which ranges no younger than earliest Bajocian (Butler et al 2005). Neither Sentusidinum granulatum nor Durotrigia filapicata has been identified in the Ness Formation of 34/10-B-12.…”

Section: Biostratigraphic Relationship Of the Gristhorpe Member And Ncontrasting

confidence: 83%

“…Although comparative sedimentological studies have been undertaken, sometimes with palynological and other palaeontological input (e.g. Hancock & Fisher 1981;Butler et al 2005), no multidisciplinary research involving megaspores has been carried out previously. As a part of a regional review of the Brent Group, Statoil ASA has recently undertaken integrated palynological and megaspore/micropalaeontological evaluations of the Snorre, Oseberg and Gullfaks field areas of the northern North Sea.…”

Section: Regional Application Of the Mb/pa Model To The Brent Group mentioning

confidence: 99%

“…Although Butler et al (2005) documented Nannoceratopsis triceras in the Ness Formation of certain unspecified regions, indicating an Aalenian age, elsewhere it appears to be absent or has not been identified, as in 34/10-B-12 and in other Norwegian sector fields such as Oseberg and Veslefrikk (Morris, personal observation). This discrepancy can be explained partly by the highly diachronous nature of the progradational lower Brent Group, as exhibited at the top Rannoch-Etive/base Ness formations, locally as in the Oseberg Field (blocks 30/6-30/9, Horda Platform; Loseth & Ryseth 2003) and regionally from south to north across the North Viking Graben (see Helland-Hansen et al 1992).…”

Section: Biostratigraphic Relationship Of the Gristhorpe Member And Nmentioning

confidence: 99%

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Megaspores and associated palynofloras of Middle Jurassic fluvio-deltaic sequences in North Yorkshire and the northern North Sea: a biofacies-based approach to palaeoenvironmental analysis and modelling

Morris¹,

Batten

2016

Journal of Micropalaeontology

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Outcrops of the Early Bajocian, Gristhorpe Member (Ravenscar Group) in North Yorkshire have been subjected to a multi-disciplinary analysis which establishes a key reference section at Yons Nab. Eight micro-biofaces types (MBs) are defined based on counts of transitional marine microfaunas, megaspores and plant-derived debris. Associated palynofloral associations (PAs) are used to qualify the micro-biofacies defined to provide an integrated model for interpreting salinity-freshwater trends associated with deltaic progradation and retreat. Megaspore and small-spore trends within the delta-plain are shown to have been closely linked to peat-mires forming in topographic lows, with variations across the delta-plain attributable to the presence of the semi-permanent and seasonal water tables. A reconstruction of the floodplain-peat-mire depositional setting is proposed where the composition of host vegetation (e.g. ferns, lycopsids) varied in relation to groundwater levels. Biostratigraphic correlation within the Gristhorpe Member is attempted using the base of 'established' delta-plain deposition (megaspore dominant MBs/ spore-dominant PAs) and the top and base agglutinated foraminifera-dominant MBs (brackish). Using these criteria the Gristhorpe Member is modelled in terms of a southward progradation of delta-plain facies into a bay-fill sequence, which persisted at Yons Nab. With the delta-plain established, the MB/PA trends and sedimentology suggest a northward shift towards the higher delta-plain, with seasonal standing water only. The MB/PA model was tested on core samples from the coeval lower Brent Group from northern North Sea well 34/10-B-12 (Gullfaks Field); MB/PA trends are shown to compare closely with those of the Gristhorpe Member at Yons Nab, with the same megaspore/small-spore associations developed within similar lithofacies. On this basis transitional marine, bay-fill and delta-plain deposition are defined in the cored section. These comparative data suggest that the dispersal of megaspore and miospore host floras occurred effectively across the Mid North Sea High, and that they colonized the same niche habitats associated with bay-fill and delta-plain development.

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Section: Biostratigraphic Relationship Of the Gristhorpe Member And Ncontrasting

confidence: 83%

Section: Biostratigraphic Relationship Of the Gristhorpe Member And Ncontrasting

confidence: 83%

Section: Regional Application Of the Mb/pa Model To The Brent Group mentioning

confidence: 99%

Section: Biostratigraphic Relationship Of the Gristhorpe Member And Nmentioning

confidence: 99%

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Megaspores and associated palynofloras of Middle Jurassic fluvio-deltaic sequences in North Yorkshire and the northern North Sea: a biofacies-based approach to palaeoenvironmental analysis and modelling

Morris¹,

Batten

2016

Journal of Micropalaeontology

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“…He recognized 11 dinoflagellate cyst taxa in the Aalenian and drew attention to the fact that dinoflagellate cysts provided a much higher stratigraphical resolution than sporomorphs. Butler et al (2005) described dinoflagellate cyst assemblages from the lower Middle Jurassic of Yorkshire, UK, as a coeval analogue for the Middle Jurassic reservoirs of the North Sea and off-shore Mid-Norway. The assemblages are characterized by high numbers and a high diversity of dinoflagellate cysts assigned to the family Phallocystaceae (=Heterocapsaceae in this study), but only little detailed occurrence data were provided.…”

Section: Previous Work On Earliest Middle Jurassic Dinoflagellate Cysmentioning

confidence: 99%

Dinoflagellate cyst biostratigraphy of the Opalinuston Formation (Middle Jurassic) in the Aalenian type area in southwest Germany and north Switzerland

Feist-Burkhardt

Pross

2010

LET

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Feist‐Burkhardt, S. & Pross, J. 2010: Dinoflagellate cyst biostratigraphy of the Opalinuston Formation (Middle Jurassic) in the Aalenian type area in southwest Germany and north Switzerland. Lethaia, Vol. 43, pp. 10–31. In order to provide a detailed dinoflagellate cyst stratigraphy of the Lower Aalenian Opalinuston Formation from the Aalenian type area, 68 samples from four boreholes and one outcrop section were analysed. The sample localities are Hausen an der Fils and Wittnau in southwest Germany, Weiach in north Switzerland and Mont Russelin in the Swiss Jura Mountains. Dinoflagellate cyst assemblages were recovered from the Late Toarcian Aalensis Zone to the Late Aalenian Murchisonae Zone. The samples yielded rich, well‐preserved and diverse assemblages with 51 dinoflagellate cyst taxa identified in total. The dinoflagellate cyst distribution data obtained from this study allow a high‐resolution biostratigraphical subdivision of the lowermost Middle Jurassic Opalinuston Formation into four palynostratigraphical units. First and last occurrences, acmes and consistent presence of the species Batiacasphaera sp. A, Evansia cf. granochagrinata, Kallosphaeridium praussii, Nannoceratopsis triangulata, Phallocysta? frommernensis and Wallodinium laganum were selected as the criteria for defining these units. The obtained high‐resolution palynostratigraphical scheme provides a basis for establishing and further refining early Middle Jurassic biostratigraphy in the Boreal and Tethyan realms. □Aalenian, biostratigraphy, dinoflagellate cysts, Germany, Jurassic, Switzerland, Toarcian.

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Multi-spheric interactions driven differential formation and accumulation of hydrocarbon resources in the North Sea Basin

Zhu,

Zhang,

Wang

et al. 2024

Sci. China Earth Sci.

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The Ravenscar Group: A coeval analogue for the Middle Jurassic reservoirs of the North Sea and offshore Mid-Norway

Cited by 17 publications

References 0 publications

Megaspores and associated palynofloras of Middle Jurassic fluvio-deltaic sequences in North Yorkshire and the northern North Sea: a biofacies-based approach to palaeoenvironmental analysis and modelling

Megaspores and associated palynofloras of Middle Jurassic fluvio-deltaic sequences in North Yorkshire and the northern North Sea: a biofacies-based approach to palaeoenvironmental analysis and modelling

Dinoflagellate cyst biostratigraphy of the Opalinuston Formation (Middle Jurassic) in the Aalenian type area in southwest Germany and north Switzerland

Multi-spheric interactions driven differential formation and accumulation of hydrocarbon resources in the North Sea Basin

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