Title
A sporomorph ecogroup model for the Northwest European Jurassic - Lower Cretaceous II: Application to an exploration well from the Dutch North Sea
Author
Abbink, O.A.
van Konijnenburg-Van Cittert, J.H.A.
van der Zwan, C.J.
Visscher, H.
Publication year
2004
Abstract
Jurassic shallow marine to non-marine depositional sequences are among the most important economic targets in the North Sea. Detailed, 'high resolution' stratigraphy of these sequences has become a necessity in both predictive geological exploration models as well as in production reservoir models. In these paralic sequences, palynomorphs are the most abundant (micro) fossil group. Palynology is increasingly challenged to improve the biostratigraphic control, and to support the sequence stratigraphical framework. Based on a recently developed, conceptual Sporomorph EcoGroup model, the quantitative distribution patterns of terrestrial palynomorphs are grouped in six Sporomorph EcoGroups (SEGs), viz. Upland, Lowland, River, Pioneer, Coastal, and Tidally-influenced SEG. Application of the SEG model to data from a marginal marine, uppermost Callovian - Middle Oxfordian section of NAM well F17-4 from the southern part of the Central North Sea Graben allows the recognition of sea-level fluctuations and climate changes. A marked palaeoclimatic shift occurred in the earliest Middle Oxfordian. The relatively cool-subtropical, humid climate changed into a warmer, subtropical-tropical, drier climate. The sea-level reconstructions based on the SEG model are validated against a latest Callovian - Earliest Oxfordian depositional sequence.
Subject
Energy / Geological Survey Netherlands
Geological Survey Netherlands
Exploration geology
Late jurassic
Palaeoclimate
Palynology
Sea level
Sequence stratigraphy
hydrocarbon exploration
Jurassic
sequence stratigraphy
Atlantic Ocean
North Sea
oceanic regions
World
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http://resolver.tudelft.nl/uuid:ce4a0e5c-bb1b-4c47-8b57-dd1d38145228
TNO identifier
237823
ISSN
0016-7746
Source
Geologie en Mijnbouw/Netherlands Journal of Geosciences, 83 (83), 81-92
Document type
article