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Sedimentologically-based geomodeling approach: reducing geological uncertainties for oilfields in Western Siberia

Authors: S.V. Parnachev, E.A. Zhukovskaya, G.G. Kravchenko, A.V. Podnebesnykh, D.S. Mikhalchenko (TomskNIPIneft JSC), I.A. Sizikov (Tomskneft OJSC)
For Late Jurassic clastic reservoir of Krapivinskoye oilfield integration of sedimentology in geomodeling workflow is presented. For main Ю13 reservoir three facies groups of shallow-marine to transition zone sediments were interpreted recognizing predictable flow units succession in the reservoir volume. Petrophysical research suggested four rock types and determined the relationship between sedimentary and recognized petrophysical units. Mostly diagenetical character of excellent quality sandstones sporadically distributed along the reservoir top was established. Finally four rock types were used for geomodeling. Porosity and permeability distribution was modeled separately for each rock types with unique poroperm relationships while saturation model was created on the base of log and averaged by Leveret’s J-function lab data.
For Late Jurassic clastic reservoir of Krapivinskoye oilfield integration of sedimentology in geomodeling workflow is presented. For main Ю13 reservoir three facies groups of shallow-marine to transition zone sediments were interpreted recognizing predictable flow units succession in the reservoir volume. Petrophysical research suggested four rock types and determined the relationship between sedimentary and recognized petrophysical units. Mostly diagenetical character of excellent quality sandstones sporadically distributed along the reservoir top was established. Finally four rock types were used for geomodeling. Porosity and permeability distribution was modeled separately for each rock types with unique poroperm relationships while saturation model was created on the base of log and averaged by Leveret’s J-function lab data.


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