Many “classical” oilfields in West Siberia represent low- relief structures with long transition zones and presence of moveable water above official oil-water contacts (OWC′s). Development of such “undersaturated” accumulations is complicated by difficulties in prediction of rate potentials for new wells and risks of high initial production watercuts.

Salym Petroleum Development (SPD) company (a 50/50 JV of Shell and Sibir Energy) is successful in developing such fields in the South of West Siberian oil province. This business success is based in part on building an effective and reliable petrophysical model of reservoir rock and fluid distribution.

This was achieved through integration of core, log an production data. At the core of the algorithm is a capillarypressure based model of transition zone interlinked with algorithms of traditional and special log evaluation as well as with models of fluid phase mobilities.

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