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Book Chapter

Chapter 23: Estimation of Chalk Heterogeneity from Stochastic Modeling Conditioned by Crosshole GPR Traveltimes and Log Data

By
Lars Nielsen
Lars Nielsen
University of Copenhagen, Department of Geography and Geology, Copenhagen, Denmark.
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Majken C. Looms
Majken C. Looms
University of Copenhagen, Department of Geography and Geology, Copenhagen, Denmark.
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Thomas M. Hansen
Thomas M. Hansen
Technical University of Denmark, Department of Informatics and Mathematical Modeling, Lyngby, Denmark.
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Knud S. Cordua
Knud S. Cordua
Technical University of Denmark, Department of Informatics and Mathematical Modeling, Lyngby, Denmark.
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Lars Stemmerik
Lars Stemmerik
University of Copenhagen, Department of Geography and Geology, Copenhagen, Denmark.
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Published:
January 01, 2010

Abstract

Rocks from the Chalk Group host important reservoirs of groundwater onshore Denmark and oil and gas in the North Sea. Fine-scale heterogeneity of rocks from the Chalk Group is investigated by stochastic modeling conditioned by first-arrival crosshole GPR traveltimes and lithology data from boreholes. The water-saturated carbonate-dominated rocks contain sharp contrasts among highly porous low-velocity carbonate, thin intercalations of flint, and hardened low-porosity carbonate of higher velocity. The stochastic simulation algorithm can model the contrasting lithologies effectively. It is found that bimodal distributions produce geologically plausible representations of the subsurface. Moreover, the variety of tested stochastic models that honors the specified data uncertainties and prior information provide a good overview of possible subsurface scenarios that the combined data set allows for. Results motivate future GPR-based tracer tests and time-lapse studies for generation of new knowledge of the dynamics of Chalk Group fluid flow.

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Contents

Geophysical Developments Series

Advances in Near-surface Seismology and Ground-penetrating Radar

Society of Exploration Geophysicists
Volume
15
ISBN electronic:
9781560802259
Publication date:
January 01, 2010

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