Abstract: Subsurface Multiscale Architectures of Bathonian-Callovian Carbonate Reservoirs Across the Paris Basin and Adjacent Basins of Eastern France

F. Gaumet, J.-P. Garcia, G. Dromart, P. Allemand, F. Guillocheau, G. Sambet

The Middle Bathonian - Middle Callovian carbonate lithologies are the stratigraphic record of a major transgressive hemi-cycle (i.e. aggrading-backstepping depositional sequences). This interval is made-up of lagoonal fine-grained, ramp and barrier oolitic/skeletal, and offshore shaley carbonate sediments.

Lithological and sedimentological data have been collected through well-log and core inspection. Biostratigraphic information (ammonites and brachiopod marker-beds) come from nearby outcrops and from cores samples. The architectures have been delineated through the correlation of the stratigraphic cycles that are the genetic sequences and the genetic-sequence sets. Three transects have been reconstructed with different extent, well-spacing, and time resolution:

(1) local East-West/Burgundy-Loire (80 km, 8 km, 20-100 ka);

(2) regional East-West/Burgundy-Maine (350 km, 27 km, 0.5-1 Ma);

(3) inter-regional North-South/Ardennes-Burgundy-Ardeche (700 km, 14 km, 0.5-1 Ma).

The objectives of the study are the following:

(1) to test the influence of the stratigraphic control upon carbonate factories (nature and productivity);

(2) to define the platform/basin carbonate volumetric partitioning;

(3) to measure the critical dimension of basement blocks that controlled carbonate factories and architectures

(4) to evaluate the 2D geometries robustness through time- and space-scale changes.

AAPG Search and Discovery Article #90956©1995 AAPG International Convention and Exposition Meeting, Nice, France