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Gas-Oil Contact Determination in Horizontal Wells while Interpreting Lwd Data in Pokur Formation
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Horizontal Wells 2019 Challenges and Opportunities, May 2019, Volume 2019, p.1 - 6
Abstract
Summary
Petrophysical interpretation of Triple-Combo LWD in horizontal wells for Pokur formation of oil/gas-condensate fields of Western Siberia is associated with several uncertainties. The reason is the reservoirs of Pokur formation are characterized with high shale volume and therefore with low-contrast formation resistivity. In this case traditional approach to Petrophysical Reservoir Estimation of LWD data based on resistivity cutoff will not work accurately and consistently and more to the point, will not allow to detect fluid contacts in horizontal wells. Furthermore Triple-Combo log data in conditions of shaly reservoir will not demonstrate qualitative indicators of gas saturation such Neutron-Density crossover. However advanced Wireline logs in pilot well will allow to build a volumetric litho-fluidal model for the similarly-named formation and afterwards, applying this model to LWD data in horizontal wells, will allow to solve a fluid contacts detection challenge.
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