The core of any reservoir modeling workflow includes five steps: gathering the data, structural and stratigraphic modeling, three-dimensional (3D) grid building, facies modeling and petrophysical modeling (Figure 1). This chapter gives an overview of each step and some ideas on how the team’s members contribute to such work, either in providing input data or in defining what the model is needed for. The team members’ contributions will be detailed starting with the third chapter. One key element of reservoir modeling is left aside at this time: geostatistics. Geostatistics give a powerful set of mathematical tools to interpolate any type of properties, using diverse constraints. These tools will be described in the second chapter.

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