Hirasaki, George J.2019-05-172019-05-172018-082018-07-12August 201Chen, Zeliang. "NMR Characterization of Fluids in Unconventional Formations." (2018) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/105818">https://hdl.handle.net/1911/105818</a>.https://hdl.handle.net/1911/105818This thesis presents a fundamental research on unconventional formations where it has been empirically observed that the saturating hydrocarbons have higher Nuclear Magnetic Resonance (NMR) T1/T2 ratio than saturating water. This empirical rule has been exploited as a powerful logging technique for oil and gas industry. But the origin of the high T1/T2 ratio were not clearly understood until now. This research confirms that the saturating heptane in kerogen has higher T1/T2 ratio than water in kerogen and clays, which validates the fluid typing technique providing the wettability. This research also proves that the origin of the high T1/T2 ratio observed on heptane is that the heptane absorbed in kerogen and/or bitumen, where the relaxation mechanism involves the 1H-1H dipole-dipole interaction. The findings in this thesis provide key insight into the high T1/T2 ratio, which can be used to improve the interpretation of NMR logs in terms of fluid typing and saturation estimation.application/pdfengCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.NMROrganic ShaleUnconventional FormationsOil and GasNMR Characterization of Fluids in Unconventional FormationsThesis2019-05-17