Foraminifera and dinoflagellate cyst zonation and stratigraphy of the Callovian to Volgian reference section in the Tyumenskaya superdeep well (West Siberia, Russia)
Published:January 01, 2005
Vera I. Ilyina, Boris L. Nikitenko, Larisa A. Glinskikh, 2005. "Foraminifera and dinoflagellate cyst zonation and stratigraphy of the Callovian to Volgian reference section in the Tyumenskaya superdeep well (West Siberia, Russia)", Recent Developments in Applied Biostratigraphy, A. J. Powell, J. B. Riding
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The Callovian to Volgian section in the Tyumenskaya superdeep well SDW-6 is very important for the development and improvement of Jurassic biostratigraphy in West Siberia. It was drilled with almost continuous recovery of core (about 200 m), which is characterized by rich assemblages of microfossils. In this paper the results of micropalaeonto-logical and palynological studies of the most complete Jurassic succession in the north of West Siberia are discussed, taking into consideration the problems of bio- and lithostratig-raphy of the region.
The comprehensive analysis of the stratigraphical distribution of the different micro-fossil groups (foraminifers, microforaminifers, ostracods, dinoflagellate cysts, acritarchs, prasinophytes, spores and pollen) allows the creation of a detailed zonation. For the first time, an almost continuous sequence of dinoflagellate cyst zones for the Callovian-Middle Volgian has been established in the north of West Siberia, providing the basis for development of the Jurassic dinoflagellate cystzonation in West Siberia.
Distinctive features of microbenthos communities and microphytoplankton associations reflecting biofacies have been studied. The pattern of distribution of microbenthic communities and microphytoplankton associations, depending on changes of transgressive-regressive events and palaeoenvironments in the Callovian to Volgian, has been established.
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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.