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ABSTRACT

A sequence stratigraphic framework has been established for the marine and continental Triassic series in the Paris Basin, France. It has been subdivided into one 1st-order major transgressive/regressive cycle, two 2nd-order transgressive/regressive facies cycles and eleven 3rd-order sequence cycles. This has been attained by well log correlation using gamma-ray-ray, sonic, neutron, density, resistivity, and SP wireline logs as the main correlation tools and calibrated core sections. Subsurface correlation was achieved by the stacking pattern analysis of genetic units recognized from well logs. Correlation with the Germany Triassic, the Southern Alps and the Dolomites has been carried out to improve accuracy in dating the succession in the Paris Basin. Each 3rd-order sequence has been subdivided into systems tracts and described with respect to its facies distribution, development and geometry. This framework has made an attempt to provide a chronostratigraphic subdivision for extensive thick fluvial sand deposits situated in the western part of the basin. By constructing a network of transects over the basin, thereby allowing three dimensional control on sequence architecture, it is possible to identify at least three stages in basin development. The depocenter migrated progressively to the west with time due to the progressive breakup of the supercontinent Pangea in the east and the subsequent opening of the Tethys seaway. The cycles are influenced by active tectonics linked to the these events. Subsidence analysis across the basin supports this theory and integrates the 2nd-order cycles defined into the basin evolution.

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