Print this page3D-Models from Outcrop Analogues. Fluvial 3D Architecture of the Escanilla Fm., Spanish Pyrenees
NAESS, ARVE, FALT, LARS-MAGNUS, JORDI CORREGIDOR, and LAEGREID, ULF
A dataset consisting of 15 large-scale, closely spaced, 2D vertical
cross-sections from the fluvial Escanilla Fm. (Spanish Pyrenees) has been used
to create a 3D model of channel architecture within a volume of 2500 x 1500 x
100 m{3}.
Each 2D-section has been assigned appropriate map-coordinates and each channel sandbody has been correlated on the basis of stratigraphic relationships and paleocurrent information. Conventional modeling tools are not suitable for describing channel geometries, and as an alter native a specially designed stochastic model builder has been adopted to model the 3D geometry of each channel. Outcrop data provide numerous control points for the model builder. The location of the different channel sandbodies is, therefore, highly constrained, producing an approximately "deterministic" model for each channel. The 41 individual channels are then merged together to produce a very heterogeneous 3D model with a channel proportion of 0.3.
Statistical parameters derived from the 3D model show that the channel width and orientation are more variable than normally used in stochastic modeling studies. The result is a model where connectivity is significantly higher than previously assumed.
In addition to providing input to stochastic modeling, the "deterministic" 3D model has also been used to improve our understanding of fluid flow and seismic response real, heterogeneous fluvial reservoirs.