Abstract

In tight liquid-rich shale formations, fast and accurate techniques to determine reservoir key parameters, such as oil and water end-point saturations, capillary pressures, relative permeabilities, and pore-size distribution (PSD) are of great interest. In this paper, we use centrifuge and nuclear magnetic resonance (NMR) to determine these parameters for several Bakken cores. First, we measured helium porosity and Klinkenberg permeability of clean and dry Middle Bakken core plugs. After saturating these core plugs with brine, we performed drainage measurements using a high-speed centrifuge. Before and after centrifuge experiment, we measured the transverse relaxation time (T2) with a 2-MHz NMR instrument for use for pore-size distribution. Our results indicate that, using both centrifuge and NMR, we can obtain important petrophysical information for use in reservoir engineering and numerical simulation applications.

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