Basin scale evolution of formation waters: a diagenetic and formation water study of the Triassic Chaunoy Formation, Paris Basin

Worden, Richard H.; Coleman, Max; Matray, Jean-Michel

doi:10.1016/s0016-7037(99)00121-0

Cited by 47 publications

(52 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…We show that the arrival of brines in the Keuper sandstone aquifer during the Tertiary, as calculated by the model, actually represents the first real salinisation of the system during its geologic history. These results are consistent with the evolution of salinity inferred from fluid inclusions in the Keuper as proposed by Worden et al [1999].…”

Section: Thermo-haline Evolutionsupporting

confidence: 91%

3-D modelling of salt and heat transport during the 248 m.y. evolution of the Paris basin : diagenetic implications

Gonçalvès

Violette

Robin

et al. 2003

Bulletin De La Société Géologique De France

View full text Add to dashboard Cite

Abstract. -A 3-D model of the Paris basin was constructed to reconstitute its 248 m.y. geologic history from the Trias to the present. The model is based on detailed stratigraphic and lithographic data from about 1,100 petroleum drillings. Its scale is regional and it covers a surface area of 700,000 km 2 , which exceeds the present extent of the basin in order to allow the paleogeographic evolution of the European plate to be taken into account. The geological history is simulated with the numerical model NEWBAS from the Ecole des Mines de Paris.The model simulates sedimentation, erosion, compaction, fluid flow and processes of solute and heat transport. The objective of this article is to demonstrate the value of this type of modelling for estimating and quantifying the role of fluid circulation in geological processes. Studies of diagenetic cements in the Dogger and Keuper aquifers in the Paris basin have often led their authors to consider the involvement of regional fluid circulation. These studies provide estimates of paleotemperature and paleosalinity which impose constraints on the modelling but the latter may, in turn, contribute to date the events and estimate the relevant processes. By reconstructing heat and salt transport, as proposed in this article, it is therefore possible to define the influence of hydrodynamics on these processes. The history of heat and salt in the basin is shown at various stages on a representative NW-SE cross-section of a present-day flow line which is also valid for Tertiary times. We demonstrate that the role of hydrodynamics may be predominant for salt transport by gravity-driven flow, which explains the salinity increase in the Keuper aquifer and the role of the Bray fault in the salinisation of the Dogger. Although the heat transport is dominated by the conductive component, it is also influenced by the hydrodynamics with a possible convective cooling effect when the head in the aquifers increased at the end of the Tertiary erosion period. This may partly explain the higher temperatures, deduced from fluid inclusions in the Keuper, at the end of the chalk deposition as compared to present ones. According to our simulations, the early Tertiary is the period most compatible with the diagenetic observations for thermal (maximum burial and convective cooling effect) and chemical reasons (topography allowing migration of brines in the Keuper and the Dogger). Résumé. -Un modèle de bassin 3D a été développé sur le bassin de Paris, reconstituant ses 248 Ma d'histoire géolo-gique depuis le Trias jusqu'à l'actuel. Cette modélisation s'appuie sur une base de données stratigraphique et lithologique détaillée constituée d'environ 1100 forages pétroliers. Ce modèle, d'échelle régionale, couvre un domaine de 700 000 km 2 , plus vaste que l'extension actuelle du bassin, afin de prendre en compte l'évolution paléogéographique de la plaque européenne. Cette histoire géologique est simulée à l'aide du modèle numérique NEWBAS de l'Ecole des Mines de Paris.Le modèle simule la sédimentation...

show abstract

Section: Thermo-haline Evolutionsupporting

confidence: 91%

3-D modelling of salt and heat transport during the 248 m.y. evolution of the Paris basin : diagenetic implications

Gonçalvès

Violette

Robin

et al. 2003

Bulletin De La Société Géologique De France

View full text Add to dashboard Cite

show abstract

“…However, for all of these waters sampled in the oilbearing fields in the centre of the Paris Basin, we observe that the SiO 2 -Quartz (Fournier and Rowe 1966) or Chalcedony ), Na/K (Michard 1979), Na/K/Ca/Mg (Fournier and Potter 1979) and Na/Li (Fouillac and Michard 1981) geothermometers give similar temperature values between 80 and 100°C (Table 4). These temperatures are in agreement with the evolution curves of both the subsidence and the temperature of the Paris Basin through time reported by Worden et al (1999). They also imply that the Triassic fluids are at equilibrium, under the current temperature conditions, with the minerals constituting the reservoir rocks.…”

Section: Waters From Chaunoy Champotran and La Torche (Saline Waters)supporting

confidence: 89%

“…The saturation indices calculated at 100°C for the Chaunoy waters (Table 5) suggest that the Triassic brines are also in equilibrium with various clays (muscovite, which can be thermodynamically considered to be the pure end-member of K-illite, montmorillonite, Rosenberg andKittrick 1990, Sanjuan et al 2003), carbonate minerals (calcite, disordered dolomite and strontianite) and sulphate minerals (anhydrite and barite). These results are in good agreement with the petrographical and mineralogical observations made on the diagenetic cements of the Triassic reservoirs, which are characterized by a single diagenetic sequence (Matray et al 1989, Azaroual et al 1997, Worden et al 1999. This diagenetic sequence is constituted mainly of dolomicrite and dolosparite cement, quartz, anhydrite cement and, in places, reprecipitated anhydrite, plagioclase and dissolved K-feldspar and several stages of neoformed illite, which are observed, in places, as the last diagenetic episode.…”

Section: Waters From Chaunoy Champotran and La Torche (Saline Waters)supporting

confidence: 89%

“…This is in agreement with our results and the saturation state of these waters with respect to quartz and chalcedony at 100°C calculated in this study (Table 5) using the EQ3NR code (Wolery 1995). In addition, the good results obtained using the Na/K geothermometer, at relatively low temperature (100°C), may be explained by the calculated saturation of these waters with respect to K-and Na-feldspar, which are two mineral phases also observed in diagenetic cements related to the basin evolution (Azaroual et al 1997, Worden et al 1999). The saturation indices calculated at 100°C for the Chaunoy waters (Table 5) suggest that the Triassic brines are also in equilibrium with various clays (muscovite, which can be thermodynamically considered to be the pure end-member of K-illite, montmorillonite, Rosenberg andKittrick 1990, Sanjuan et al 2003), carbonate minerals (calcite, disordered dolomite and strontianite) and sulphate minerals (anhydrite and barite).…”

Section: Waters From Chaunoy Champotran and La Torche (Saline Waters)supporting

confidence: 68%

“…Matray et al (1994) investigated Dogger formation waters in the Paris Basin and suggested a possible exchange of groundwaters in the Dogger and Triassic aquifers by the migration of brine from the Triassic to the Dogger formation. Other exchanges between Jurassic and Triassic aquifers are discussed by Worden et al (1999), in particular for the "Chaunoy Sandstones Formation". These authors suggested that waters from the Triassic Chaunoy formation might migrate towards the Dogger formation to compensate for the meteoric contribution.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations