Title: NMR in organic shale: current research activities at Rice University
Date: January 17th , 2018
Location: Auditorium at 1500 Louisiana Street (Chevron building)
Time: 11:30 am -1:00 pm
or limited parking on the street side using Park & Pay (Cash only)
Room Capacity: 200
Lunch Cost: $15 and $10 for students and in transition professionals.
Please register by Jan 16th 12 pm to reserve lunch.
Officer Contact: Rohollah A. Pour, 512-965-7248 or email@example.com
Abstract: NMR is proving to be an evermore powerful technique for characterizing unconventional reservoirs such as gas-shale and tight-oil shale. However, much is still to be understood on a fundamental level, such as the origin of the large T1/T2 ratio for hydrocarbons in organic shale, and its implication on fluid typing. In this presentation, I will review some of the recent activities and breakthroughs from the Hirasaki research group and the Chapman research group at the Department of Chemical and Biomolecular Engineering, Rice University. Our approach is to integrate NMR (nuclear magnetic resonance) measurements with MD (molecular dynamics) simulations and molecular DFT (density functional theory), with the goal of understanding the effects of nano-pore confinement on fluids in organic shale. I will present NMR measurements of heptane-saturated kerogen-isolates, which clearly show large T1/T2 ratios for heptane in the organic nano-pores of kerogen. Further insight is obtained when we extract the bitumen from the kerogen isolates, revealing diffusive-coupling effects between the absorbed heptane in the kerogen grains and the inter-granular heptane. To better understand the origin of the large T1/T2 ratios, we then study polymer-heptane mixes, where the high-viscosity polymer is a substitute for kerogen. NMR measurements and MD simulations of the polymer-heptane mix show large T1/T2 ratios for heptane in the organic “nano-pores” of the polymer, without any paramagnetic impurities involved. This indicates that 1H-1H dipole-dipole interactions dominate the NMR response of fluids under organic nano-pore confinement, and reveals the origins of the large T1/T2 ratios. We also show that the surface-relaxivity for heptane in the polymer-heptane mix is dispersive (i.e. depends on the NMR frequency), and increases with decreasing pore-size.
Bio: Philip M. Singer is a research scientist in the Hirasaki research group at the Department of Chemical and Biomolecular Engineering, Rice University in Houston TX, focused on NMR core and fluid analysis. Previously, he worked at Schlumberger for 10 years, as laboratory supervisor of the NMR core analysis department at the Schlumberger Reservoir Laboratories in Houston TX, and as senior research scientist at Schlumberger-Doll Research in Cambridge MA and Schlumberger Dhahran Carbonate Research Centre in Saudi Arabia. He holds a M.Sc. in Physics from the University of Oxford, and a Ph.D. in Physics from the Massachusetts Institute of Technology.
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