Downward hydrocarbon migration predicted from numerical modeling of fluid overpressure in the Paleozoic Anticosti Basin,eastern Canada

The Anticosti Basin is a large Paleozoic basin in eastern Canada where potential source and reservoir rocks have been identified but no economic hydrocarbon reservoirs have been found. Potential source rocks of the Upper Ordovician Macasty Formation overlie carbonates of the Middle Ordovician Mingan Formation, which are underlain by dolostones of the Lower Ordovician Romaine Formation. These carbonates have been subjected to dissolution and dolomitization and are potential hydrocarbon reservoirs. Numerical simulations of fluid‐overpressure development related to sediment compaction and hydrocarbon generation were carried out to investigate whether hydrocarbons generated in the Macasty Formation could migrate downward into the underlying Mingan and Romaine formations. The modeling results indicate that, in the central part of the basin, maximum fluid overpressures developed above the Macasty Formation due to rapid sedimentation. This overpressured core dissipated gradually with time, but the overpressure pattern (i.e. maximum overpressure above source rock) was maintained during the generation of oil and gas. The downward impelling force associated with fluid‐overpressure gradients in the central part of the basin was stronger than the buoyancy force for oil, whereas the buoyancy force for gas and for oil generated in the later stage of the basin is stronger than the overpressure‐related force. Based on these results, it is proposed that oil generated from the Macasty Formation in the central part of the basin first moved downward into the Mingan and Romaine formations, and then migrated laterally up‐dip toward the basin margin, whereas gas throughout the basin and oil generated in the northern part of the basin generally moved upward. Consequently, gas reservoirs are predicted to occur in the upper part of the basin, whereas oil reservoirs are more likely to be found in the strata below the source rocks. Geofluids (2010) 10 , 334–350     

CONTRIBUTION DES TECHNOLOGIES D'INFORMATION ET DE COMMUNICATION AU DÉVELOPPEMENT

L'évaluation réalisée pour l'Union Européenne de 25 applications de technologies d'information et de communication, a permis de tirer des leçons sur la contribution des TIC au développement rural. Les résultats de cette évaluation mettent en évidence l'importance du contexte économique, social et culturel dans lequel se situe l'introduction de la technologie, ainsi que celle d'autres facteurs dans la réussite ou l'échec d'une application. Ils montrent également que la centralité de la technologie est variable selon les projets. Enfin, ils identifient les différents modes de développement qui sont impulsés.
Lessons have been learned from an evaluation of 25 telematic applications, undertaken for the European Union, on the contribution of TIC to rural development. Evaluation results show the importance of the economic, social, and cultural context and the presence of other factors for the success (or failure) of an application. These results also show that the importance of the technology varies from one project to the next. Finally, these applications lead to different development types.     

INTERNET ET LA RECOMPOSITION TERRITORIALE DES RELATIONS DANS L'AGRICULTURE SUISSE

L'agriculture et l'industrie agro-alimentaire suisses se transformed très rapidement. À un monde industrial fonctionnant à l'échelle nationale et basé sur des normes techniques succède un monde domestique basé sur l'identité régionale et les relations interpersonnelles. L'utilisation d'Internet devrait participer à la recomposition des relations entre producteurs et consommateurs et refléter les transformations territoriales qu'elles impliquent. Or les sites Internet de promotion des produits agricoles ne reflètent pas ces changements. Un processus d'apprentissage qui porte sur la maîtrise des techniques et leurs possibilitès d'utilisation est en cours.
The agriculture and food industry of Switzerland is undergoing rapid changes. An industrial world functioning on the national scale is being succeeded by a domestic world based on regional identity and person-to-person relationships. The use of the Internet should contribute to the restructuring of relations between producers and consumers and should reflect the territorial transformations which they imply. However, Internet sites advertising agricultural products do not reflect these changes. A learning process — related to the control of techniques and their opportunities — is currently underway.