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SIMMONS, MIKE, BP exploration, Stockley Park, Uxbridge, Middlesex, UK

ABSTRACT: Biofacies Characterisation of Previous HitSystemsNext Hit Previous HitTractsNext Hit in Cretaceous Carbonate Platforms

Biostratigraphy has an important role to play in sequence stratigraphic studies, beyond simply providing a chronostratigraphic framework. Recognition of Previous HitsystemsNext Hit Previous HittractsNext Hit is a powerful predictive tool for the exploration geoscientist -- an application of biostratigraphy to sequence stratigraphy is the characterization of Previous HitsystemsNext Hit Previous HittractsNext Hit in terms of their biofacies.

Previous HitSystemsNext Hit Previous HittractsNext Hit prograde, retrograde or aggrade, depending on their position during Previous HitseaNext Hit-Previous HitlevelNext Hit rise and fall. From the detailed study of biofacies, shallowing-up or deepening-up trends can be established, which indicate likely Previous HitsystemsNext Hit tract. Furthermore, it seems possible that for given environmental settings at given geological times, Previous HitsystemsNext Hit Previous HittractsNext Hit could be characterised by particular assemblages (i.e. the composition, diversity and density of assemblages and the morphology and size of individuals) that are themselves the response to relative Previous HitseaNext Hit-Previous HitlevelNext Hit change. Opportunistic taxa may characterize a transgressive system tract, whilst species diversification may take place during the highstand Previous HitsystemsNext Hit tract.

This study considers the biological response to system Previous HittractsTop development in Cretaceous carbonate platforms, using the early-mid-Cretaceous platforms of the Middle East as an example. In addition, the Cretaceous platform carbonates of Central Asia and the Mediterranean region are reviewed and their responses compared to those of the Middle East platforms.

AAPG Search and Discovery Article #90987©1993 AAPG Annual Convention, New Orleans, Louisiana, April 25-28, 1993.