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Capillary Pressure Model Application for Hydrocarbon Saturation Determination in Transition Zone with Adaptive Well Logging Technology
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 74th EAGE Conference and Exhibition incorporating EUROPEC 2012, Jun 2012, cp-293-00558
- ISBN: 978-90-73834-27-9
Abstract
In oilfields development process it is necessary to determine attitude of fluidal contacts performed by the deposit area on the base of geological, geophysical and petrophysical data integration add-in advanced well logging techniques. Hydrocarbon distribution in oil-water transition zone reflects total reservoir properties that characterize current fluid saturation value dependence on capillary pressure. Brooks-Corey power model is widely used for determination of the relation between water saturation and capillary pressure. Brooks-Corey model describes capillary pressure curves shape not accurately at low and high current water saturation levels which reflects on quality of the capillary pressure changes account in various ranges of permeability. To overcome this shortcoming we propose new model, controlled by a single parameter that is closely related to permeability. Model validation was performed for a representative core samples collection of fine-grained Jurassic sandstones with complex mineral composition. It is established that proposed model provides more accurate description of core laboratory data in comparison with the Brooks-Corey model. Developed model allows more accurate determination of the displaced fluid share at a given capillary pressure during drainage in comparison with known analogues.