--> ABSTRACT: Sequence and Seismic Stratigraphic Interpretation Methods Within Active Extensional Basins: Examples from the Norwegian Central Graben Region, North Sea, by Paul Spencer; #91020 (1995).
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Sequence and Seismic Stratigraphic Previous HitInterpretationNext Hit Methods Within Active Extensional Basins: Examples from the Norwegian Central Graben Region, North Sea

Paul Spencer

The Upper Jurassic succession of the Norwegian Central Graben Region has been subjected to several extensional tectonic phases and suffered extreme halokinesis.

The resultant complex distribution of the Upper Jurassic sediments in this region requires a full integration of sequence stratigraphy, regional tectonics and halokinesis to develop a realistic Previous HitinterpretationNext Hit.

Utilising the workstation-mounted Charisma 3.7TM Previous HitinterpretationNext Hit software, Candidate Correlative Surfaces (CCS's) are recognised on the basis of reflection terminations. CCS's have been use to delimit seismic packages, or sequences, which are defined purely on the basis of their internal reflection character, the nature of the bounding CCS's and their overall geometry. They have no sequence stratigraphic significance sensu Galloway (1989) and the Exxon Group (Payton, 1977) yet they allow the Previous HitinterpretationNext Hit of the region in a chronostratigraphic/seismo-stratigraphic manner. This Previous HitinterpretationNext Hit is independent of lithostratigraphic nomenclature a therefore, pre-Previous HitinterpretationTop bias based on published data.

Horizon flattening on the CCS's allows the recognition of thickening-away geometries adjacent to salt pillows and diapirs and divergent geometries into a grabens boundary fault. This facilitates the identification of the syn-halokinetic versus the pre-, syn- and post-rift intervals, therefore inferring which control dominated a basins depositional style.

This technique has been used in several spatially unrelated basins in the Norwegian Central Graben, and has been used to successfully identify and correlate regional-genetic events within sub-basins that are dominated by normal faulting and halokinesis respectively.

AAPG Search and Discovery Article #91020©1995 AAPG Annual Convention, Houston, Texas, May 5-8, 1995