FLOW OF FORMATION WATER IN THE JURASSIC OF THE PARIS BASIN AND ITS EFFECTS

The Jurassic of the Paris Basin is a major target for oil and geotherm al exploitation. Interpretation of data from numerous wells reveals th at the spatial distribution of fluid and reservoir parameters is heter ogeneous with correlated anomalies for temperature and geochemistry. T he multidisciplinary approach used to describe these typical character istics shows that hydrodynamics provides the key to explain observed d eviations from the usual correlations with depth. As a consequence of the coupling between hydrodynamics and fluid properties, the analysis of induced effects is a calibration criterion which can be used to imp rove the numerical simulation of the regional flow path. Compared to t he results of the constant density approach, the new computer flow sch eme, both gravity and density driven, is more consistent with the ther mal and chemical anomalies observed. The refined analysis, including d ensity effects, confirms the existence of a confined area and a mixing zone around Paris, previously identified by geochemical investigation s.