MEASUREMENT OF TECTONIC AND EUSTATIC SIGNALS FROM STRATIGRAPHIC INFORMATION WITHIN AN INTRACRATONIC BASIN - APPLICATION TO THE LIAS OF THE PARIS BASIN

The objective was to discriminate at time-scales of 1 to 5 Ma, the rel ative importance of tectonism and eustatism using as example an intrac ratonic basin, the Paris Basin during Liasic time. This discrimination is based on a 3-dimensional measurement of the relative sea-level cha nge or accommodation, by correlation of 380 wells. Correlations are ba sed on high resolution sequence stratigraphy principles. The eustatic signal is the common value over the whole studied area, the tectonic s ignal is the space variable component. We propose a method for discrim ination of those two signals based on wavelength analysis. We show tha t cycles of 1-5 Ma duration record a cyclic, non-periodic, relative se a-level change of tectonic origin in response to intraplate deformatio n.