High-resolution sequence stratigraphy as a controller for facies simulation.
in: Proc. 27th Gocad Meeting, Nancy
Abstract
The genetic stratigraphy concepts state that the distribution of sedimentary bodies is controlled both by
the accommodation rate and by the sediment supply. The main rule introduced by this stratigraphic approach
is known as the A/S ration concept, describing the different stratigraphic system tracts. For instance, transgressions
are identified by an A/S ratio greater than 1 while regressions corresponds to a ratio lower than 1.
Based on this concept, we propose a methodology for the modeling of the paleotopography, by accounting
for stratigraphic records, well data and sedimentological rules. From the paleotopography, facies probabilities
are then deduced using facies occurrence rules. As a corollary of the A/S ratio concept, the sediment
volumetric partitioning rule states that the sediments are better preserved in the distal pole during regressions
and in the proximal pole during transgressions. If transgressions and regressions are well identified
on the chronostratigraphic correlations, the lateral gradient of the sediment thickness provides an indicator
of the distality vector. Using DSI interpolation of membership functions constrained by trend vectors, we
propose to compute a second probability field accounting for the distality. The advantage of this additional
probability field is to better capture information about the facies distribution in case of confinement, like
for instance in lagoon systems. By combining these facies probabilities, the suggested solution provides
a more complete description of the sedimentary system and gives more realistic facies simulations. This
methodology implemented in the Thalassa plug-in is illustrated on clastic and carbonate reservoirs.
Download / Links
BibTeX Reference
@inproceedings{P310_Kedzierski,
abstract = { The genetic stratigraphy concepts state that the distribution of sedimentary bodies is controlled both by
the accommodation rate and by the sediment supply. The main rule introduced by this stratigraphic approach
is known as the A/S ration concept, describing the different stratigraphic system tracts. For instance, transgressions
are identified by an A/S ratio greater than 1 while regressions corresponds to a ratio lower than 1.
Based on this concept, we propose a methodology for the modeling of the paleotopography, by accounting
for stratigraphic records, well data and sedimentological rules. From the paleotopography, facies probabilities
are then deduced using facies occurrence rules. As a corollary of the A/S ratio concept, the sediment
volumetric partitioning rule states that the sediments are better preserved in the distal pole during regressions
and in the proximal pole during transgressions. If transgressions and regressions are well identified
on the chronostratigraphic correlations, the lateral gradient of the sediment thickness provides an indicator
of the distality vector. Using DSI interpolation of membership functions constrained by trend vectors, we
propose to compute a second probability field accounting for the distality. The advantage of this additional
probability field is to better capture information about the facies distribution in case of confinement, like
for instance in lagoon systems. By combining these facies probabilities, the suggested solution provides
a more complete description of the sedimentary system and gives more realistic facies simulations. This
methodology implemented in the Thalassa plug-in is illustrated on clastic and carbonate reservoirs. },
author = { Kedzierski, Pierre AND Mallet, Jean-Laurent AND Clark, M. S. AND Caumon, Guillaume },
booktitle = { Proc. 27th Gocad Meeting, Nancy },
title = { High-resolution sequence stratigraphy as a controller for facies simulation. },
year = { 2007 }
}