On conventional exploratory process, the interpretation project covers an area not too large and thus seismic 3D data are acquired and processed in a unique coordinate system. Nowadays there is a need to work with large areas, and a question arises: How can I load a 3D seismic data processed in a cartographic projection on an interpretation project created in another one? Recalling that a straight line in a projection becomes a curved line in another projection, the reprojection of seismic grid data can lead to a positional error of up to 400 meters. This paper aims to detail the problem to prevent new episodes and provide a solution that would minimize or avoid this type of occurrence, using the OpenWorks R5000 solution: data is stored in its original coordinate system, the interpretation project may use another cartographic system (large area fitted) and 3D data is handled in small parts.
