Geological Modelling — A Process Perspective

Peter Raymant
Geomodelling Services Ltd, Penryn, United Kingdom

At this time, Geological Modelling means different things to different people in Exploration & Production. To some it means only the modelling of rock properties or facies distribution, but increasingly the term is used to describe the process of creating a complete subsurface model or models (both structure and detailed geology) for prospect or field evaluation and development from basic seismic, well and other subsurface data.

In this context the term Geological Modelling includes not only 3D structural and property modelling but also volumetric assessment, uncertainty analysis and 2D modelling using maps and cross-sections (modelling before 3D computer methods) and even reservoir simulation.

This presentation takes the stand that the latter view of an all encompassing modelling process is the most appropriate and increasingly the most common, and attempts to demonstrate, using a process approach without reference to specific software tools or commercial processes, the key Geological Modelling activities within the context of integrated subsurface field evaluation work at appraisal or development stage.

The concepts are however easily extended to other areas. Using the process maps the role of common software offerings in the Geological Modelling area can also be easily identified, although this is not the role of this presentation.

The central role played by Geological Modelling, and the importance of integration with key subsurface disciplines and activities within an integrated team environment is also demonstrated. As production demands rise and field development becomes more complex, good Geological Modelling becomes paramount and this can only be achieved if it is properly understood and integrated with other subsurface activities.

AAPG International Conference and Exhibition, Cape Town, South Africa 2008 © AAPG Search and Discovery