--> Abstract: Sequence Stratigraphy of the Jurassic: New Data from the Paris-London Basin Compiled on Well Logs, by C. M. Ponsot and P. R. Vail; #91004 (1991)
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Previous HitSequenceNext Hit Stratigraphy of the Jurassic: New Data from the Paris-London Basin Compiled on Previous HitWellNext Hit Logs

PONSOT, C. M., and P. R. VAIL, Rice University, Houston, TX

A Previous HitsequenceNext Hit stratigraphic Previous HitanalysisNext Hit of the Jurassic sedimentary succession in Paris basin is derived from an integration of subsurface Previous HitlogNext Hit correlations, field observations, and reinterpretations of field descriptions. The Previous HitanalysisNext Hit is presented on two Previous HitlogNext Hit sections, one crossing the basin from northeast to southwest and the other from northwest to southeast (approximately 80 logs).

A vast quantity of field data, collected all around the Paris basin (English Dorset, French Normandy, Manche, Ardennes, Lorraine, Bourgogne) allowed the sequences and system tracts boundaries to be traced and dated at the same time or prior to being recognized on Previous HitwellNext Hit Previous HitlogNext Hit data.

The Lias period (210-179 m.y.) includes 14 interpreted sequences boundaries: Hettangian: 211,202; Sinemurian: 199, 198, 194.5; Pliensbachian: 190.5, 188.5, 188.3, 188, 186.5; and Toarcian: 184?, 182.5, 181, 179.5. We consider the 211 m.y. Previous HitsequenceNext Hit boundary to fall within the Jurassic even if it is of Late Rheatian age. Frequently the Toarcian sediments experienced partial erosion in the study areas; some depositional sequences of that time may have been missed.

Fourteen Previous HitsequenceNext Hit boundaries recognized during Dogger time (179-152 m.y.) include: Aalenian: Aal, 177, 175; Bajocian: 169, 168, 165.3; Bathonian: 163, 161.8, 160.8, 159.5, 158.5; and Callovian: 156, 154.3, 152.5. As the producing reservoirs of the Paris basin were deposited during Dogger time, the sedimentary column is Previous HitwellNext Hit documented and Previous HitwellNext Hit dated on outcrops and Previous HitwellNext Hit logs. The sole exceptions are the Aalenian/Bajocian sediments that were either partly eroded or deposited as condensed intervals.

The eighteen Previous HitsequenceNext Hit boundaries interpreted for the Malm period (152-131 m.y.) include: Oxfordian: 151.5, 150.2, 149.5, 149, 148, 147.5, 146.5, 145.2?; Kimmeridgian: 144, 143, 142, 140, 139, 138.5; and Portlandian: 136, 134.5, 133.8, 131. The sedimentary column for this period is relatively Previous HitwellTop documented.

In comparison with the Haq et al. 1987 cycle chart, 16 new sequences have been added: three for the Lias, seven for the Dogger, and six for the Malm. Occasionally, ages of some of the already recognized sequences boundaries have been slightly modified to fit new biostratal data. These biostratal data were usually at the scale of the ammonite sub-zone and the actual given ages all tie with the 1987 Haq et al. chart time scale.

 

AAPG Search and Discovery Article #91004 © 1991 AAPG Annual Convention Dallas, Texas, April 7-10, 1991 (2009)