Labourdette, Richard¹, Philippe Crumeyrolle¹, Eduardo Remacha², Ferran Climent², Ferran Bolaño², Gemma Gual² 
(1) Total S.A, Pau, France 
(2) Universitat Autonoma de Barcelona, Spain

ABSTRACT: 3D Sedimentary Modeling of Turbidite Systems using GOSED and Object Modeling Tools (Ainsa Sub-basin, South Central Pyrenees, Spain)

Modern 3D seismic surveys reveal detailed reservoir architecture and provide higher lateral resolution of facies association variability and stratigraphic architecture which are of primary importance when dealing with deep offshore turbidite reservoirs. 
As a consequence, it was decided to go back to the rocks with the study of the Ainsa sub-basin turbidite outcrops with the aim of representing the 3D architecture of several channelised turbidite systems. 
The 3D architectural model representing the turbidite systems of the Ainsa sub-basin was built using the GOSED software, which provides intuitive and familiar tools for sedimentologists to work effectively within the reservoir modelling workflow by allowing the integration of sedimentological data and concepts directly into the 3D modelling environment. 
The final models have a realistic appearance and are constrained by well data, cross-sections or by outcrop sedimentological observation. 
But facies association modeling, can not provide very fine scale facies variations which complicate the reservoir characteristics These very fine-scale heterogeneities, often below seismic resolution, are rarely represented in the initial reservoir models designed for the field. 
The second step was object-based simulations to capture those heterogeneities according to field observations. 
The sinuosity of each single channel, filling the fairways of Ainsa turbiditic systems are reproduced, allowing sedimentologists to fill each channels with there knowledge concepts and observations. 
The integration of the large scale sedimentary geological 3D model with the structural model furnish new insights on how small and large scale turbidite stages and substages facies distribution architecture evolves in 3D.

AAPG Search and Discovery Article #90026©2004 AAPG Annual Meeting, Dallas, Texas, April 18-21, 2004.