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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 77 (1993)

Issue: 2. (February)

First Page: 194

Last Page: 211

Title: Influence of Lithology and Neogene Uplift on Seismic Velocities in Denmark: Implications for Previous HitDepthNext Hit Conversion of Maps

Author(s): Peter Japsen (2)

Abstract:

A new Previous HitvelocityNext Hit parameter, the Previous HitvelocityNext Hit anomaly (dV), is defined as the deviation between a Previous HitvelocityNext Hit measurement and a linear Previous HitvelocityNext Hit-Previous HitdepthNext Hit function for a formation.

The variation of the Previous HitvelocityNext Hit anomaly of the lowermost Jurassic claystones in northern Denmark is interpreted as the combined effect of three types of uplift movements, and the magnitude of these are estimated. It is concluded that the pre-Quaternary surface in northern Denmark is an erosional surface, created by up to 1000 m of Neogene uplift and subsequent erosion. The Upper Cretaceous Danian Chalk Group and the Tertiary sequence must thus have been deposited far beyond their present extensions. Consequences of Neogene uplift for the source rock potential of the area are discussed.

In the Danish Central Trough, North Sea, the Previous HitvelocityNext Hit anomaly of the Lower Cretaceous is shown to reflect lithological variations related to differential subsidence and to characterize the geological regions better than the interval Previous HitvelocityNext Hit.

Since the primary influence of Previous HitdepthNext Hit on Previous HitvelocityNext Hit is removed, the Previous HitvelocityNext Hit anomaly is an expression of physical factors such as lithology, overpressure, and gas content as well as uplift and erosion. Contoured maps based on well data of the Previous HitvelocityNext Hit anomaly of a formation may thus be used to estimate the Previous HitvelocityNext Hit anomaly at arbitrary locations. The Previous HitvelocityNext Hit anomaly map, the seismic time maps, and the linear Previous HitvelocityNext Hit parameters for each layer constitute the input for Previous HitvelocityNext Hit-anomaly Previous HitdepthNext Hit conversion. This Previous HitdepthNext Hit-conversion method results in Previous HitdepthNext Hit maps with perfect well ties and geologically reasonable Previous HitdepthTop estimates away from wells.

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