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Gas-Oil Contact Determination in Horizontal Wells while Interpreting Lwd Data in Pokur FormationNormal access

Authors: I. Malikova, Y. Kosharnaya, A. Bokarev and M. Lavrentiev
Event name: Horizontal Wells 2019 Challenges and Opportunities
Session: У04. Петрофизика и керн в горизонтальных скважинах
Publication date: 27 May 2019
DOI: 10.3997/2214-4609.201901856
Organisations: EAGE
Language: Russian
Info: Extended abstract, PDF ( 1.05Mb )
Price: € 20

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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