Core Analysis and Core-Log Integration for Evaluation of Unconventional Formations

dc.contributor.advisorHirasaki, George Jen_US
dc.creatorChen, Zeliangen_US
dc.date.accessioned2019-08-12T14:21:33Zen_US
dc.date.available2020-08-01T05:01:09Zen_US
dc.date.created2019-08en_US
dc.date.issued2019-08-09en_US
dc.date.submittedAugust 2019en_US
dc.date.updated2019-08-12T14:21:33Zen_US
dc.description.abstractUnconventional resources are of great importance in the global energy supply. This thesis develops new techniques and presents fundamental research serving unconventional formations evaluation for the petroleum industry. First, hydrocarbon composition is a critical input to formation evaluation. In this thesis, a new technique using laboratory Nuclear Magnetic Resonance (NMR) core-analysis integrated with downhole NMR logging is developed to estimate the hydrocarbon composition in an organic-rich chalk prospect. More specifically, the contrasts in T2 and T1/T2 distributions between fluids are used for fluid typing. Meanwhile, another technique based on the NMR laboratory-measured restricted diffusion of light hydrocarbons is proposed to estimate the mean pore size, heterogeneity length scale, and tortuosity of the hydrocarbon-filled porosity. Second, it has been commonly observed that in organic-rich shale, the saturating hydrocarbons have higher NMR T1/T2 ratio than the saturating water. However, the origin of the high T1/T2 ratio was not clearly understood until now. In this thesis, the organic matter (i.e., kerogen) in the organic-rich shale is isolated for investigation. It is confirmed 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 thesis also proves that the high T1/T2 ratio originates from dissolved heptane in kerogen and/or bitumen, where the dominant relaxation mechanism can be the 1H-1H dipole-dipole interaction, as a result of nanopore confinement. Last but not least, permeability is an indicator of the producibility of reservoirs, and thereby a critical petrophysical property during formation evaluation. The existing ultralow-permeability measurement approaches for unconventional formations, including both steady-state and unsteady-state approaches, confronting various challenges. In this thesis, a novel unsteady-state method is proposed to determine the permeability by history matching, which consists of 1D transient-pressure experiments and numerical simulation incorporating real-gas pseudo pressure and table lookup. This novel method helps to improve the experimental efficiency, simplify the set-ups, reduce the interpretation complexity, and alleviate the pressure-limit constraint. These new technologies and fundamental understandings could in principle be used to improve the evaluation of unconventional formations.en_US
dc.embargo.terms2020-08-01en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationChen, Zeliang. "Core Analysis and Core-Log Integration for Evaluation of Unconventional Formations." (2019) Diss., Rice University. <a href="https://hdl.handle.net/1911/106197">https://hdl.handle.net/1911/106197</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/106197en_US
dc.language.isoengen_US
dc.rightsCopyright 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.en_US
dc.subjectFormation Evaluationen_US
dc.subjectNMRen_US
dc.subjectPermeabilityen_US
dc.subjectSimulationen_US
dc.titleCore Analysis and Core-Log Integration for Evaluation of Unconventional Formationsen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentApplied Physicsen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelDoctoralen_US
thesis.degree.majorApp Phys/Chem-Biomolecular Engen_US
thesis.degree.nameDoctor of Philosophyen_US
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