The Ravenscar Group: A coeval analogue for the Middle Jurassic reservoirs of the North Sea and offshore Mid-Norway
Published:January 01, 2005
N. Butler, M. A. Charnock, K. O. Hager, C. A. Watkins, 2005. "The Ravenscar Group: A coeval analogue for the Middle Jurassic reservoirs of the North Sea and offshore Mid-Norway", Recent Developments in Applied Biostratigraphy, A. J. Powell, J. B. Riding
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A palynostratigraphical study of the Middle Jurassic Ravenscar Group, Cleveland Basin, northern England involving the integration of miospore and microplankton data with sedimentary facies data has resulted in improvements in the stratigraphical resolution of offshore hydrocarbon-bearing strata in the North Viking Graben and Mid-Norway. The Dogger Formation is of ‘earliest’ Aalenian age and is correlative with the uppermost Dunlin Group, Drake Formation and Båt Group, Ror Formation. The overlying Aalenian Saltwick and Eller Beck formations correlate with the Brent Group, Broom-Rannoch-Etive-Ness and the Fangst Group, Ile-Not–‘lower’ Garn genetic packages. The Cloughton Formation is either unrepresented or condensed in the Brent Province and Mid-Norway due to a regional unconformity, which truncates lower Bajocian sediments. The Scarborough Formation is of ‘latest’ early to ‘earliest’ late Bajocian age and correlative with the older part of the Tarbert-Heather and the ‘upper’ Garn-Melke genetic packages. These interpretations contrast markedly with the majority of those published.
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Recent Developments in Applied Biostratigraphy
In recent years the application of biostratigraphy to hydrocarbon exploration and development has become increasingly important both scientifically and economically. The demand for higher stratigraphical resolution in field development studies has resulted in the utilization of new approaches. However, in under-explored areas with little reliable primary biostratigraphical data, conventional methods using relatively coarse biozonations still have relevance. The aim of this volume is to encourage an exchange of ideas and to seed new research initiatives particularly within integrated multidisciplinary teams. The papers are divided into four main themes which cover a broad range of modern applications of biostratigraphy. The first three themes are: UK North Sea field development; outcrop analogues; and international exploration and development. The final section discusses new methodologies, such as the application of correspondence analysis and multivariate correlation of wells, and palynological processing techniques applicable to the wellsite.