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Sequence Stratigraphic Setting of Lower Carboniferous Black Shales in England and the Netherlands
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 75th EAGE Conference & Exhibition incorporating SPE EUROPEC 2013, Jun 2013, cp-348-00432
- ISBN: 978-90-73834-48-4
Abstract
Black shales are well-known from Lower Carboniferous units in the Northwest European Carboniferous Basin, but they are poorly understood in terms of sequence stratigraphy. The aim of the study was the creation of a sequence stratigraphic frame for Lower Carboniferous sediments in England and the Netherlands and to study the shale gas potential of black shales. The study is based on well logs, 2D-seismic data and bulk geochemical parameters. The Upper Dinantian basinal sediments in the Widmerpool Gulf display three TSTs separated by two HSTs. TOC contents reach up to 4%. The sequence stratigraphic subdivision of the Widmerpool Gulf cannot be transferred to the Stainmore Trough. This is a consequence of the narrow horst/graben configuration. Log facies and seismo-stratigraphic setting of the Namurian Upper Bowland Shale and the Lower Sabden Shale in Middle England show two general coarsening upward trends. TOC contents are up to 9% despite of partly high maturity. The Geverik Member in the Netherlands is a time-equivalent to the Upper Bowland Shale. It is also organic matter rich and lateral continuous. In contrast to the Upper Bowland Shale, the Geverik Member represents a TST. In general there is a close relationship between TOC contents and systems tracts.