Abstract
Mature oilfields, especially some of the large onshore oilfields in the Middle East, may have hundreds of oil wells drilled, often on a regular grid. There may be detailed petrophysical and geological information known for each location. But this information is only valid over a short radius from the well bore. Therefore, uncertainty exists over the considerable distances between the well locations. Acquisition of high resolution, 3D seismic data, and the subsequent interpretation of the reservoir, improves the confidence of the reservoir engineer's structural and stratigraphic model of the reservoir.