Experimental Study of the PVTX Properties of the System H₂O-CH₄

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dc.contributor.authorLin, Fangen
dc.contributor.committeechairBodnar, Robert J.en
dc.contributor.committeememberRead, James Fredricken
dc.contributor.committeememberDove, Patricia M.en
dc.contributor.committeememberSum, Amadeu K.en
dc.contributor.committeememberSchreiber, Madeline E.en
dc.contributor.departmentGeosciencesen
dc.date.accessioned2014-03-14T20:17:07Zen
dc.date.adate2005-10-21en
dc.date.available2014-03-14T20:17:07Zen
dc.date.issued2005-09-23en
dc.date.rdate2005-10-21en
dc.date.sdate2005-10-06en
dc.description.abstractThe system H₂O-CH₄ is found in a variety of geological environments in the earth’s crust, from sedimentary basins to low grade metamorphic terrains. Knowledge of the PressureVolume-Temperature-Composition (PVTX) properties of the H₂O-CH₄ system is necessary to understand the role that these fluids play in different geological environments. In this study the properties of the H₂O-CH₄ fluid system at elevated temperatures and pressures has been investigated experimentally to determine the PVTX properties of H₂O-CH₄ fluids in the P-T range equivalent to late diagenetic to low grade metamorphic environments, and XCH₄≤4mol%. A study has also been conducted to determine methane hydrate stability over the temperature range of -40~20°C. Synthetic fluid inclusions were employed in both studies as miniature autoclaves. Experimental data for the PVTX properties of H₂O-CH₄ fluids under late diagenetic to low grade metamorphic conditions was used to calculate the slopes of isoTh lines (the line connecting the P-T conditions of the inclusions at formation and at homogenization) at different PTX conditions. An empirical equation to describe the slope of iso-Th line as a function of homogenization temperature and fluid composition was developed. The equation is applicable to natural H₂O-CH₄ fluid inclusions up to 500°C and 3 kilobars, for fluid compositions ≤4 mol% CH₄. The Raman peak position of CH₄ gas is a function of the pressure and temperature. This relationship was used to determine the pressure along the methane hydrate stability curve in the H₂O-CH₄ system. The combined synthetic fluid inclusion, microthermometry and Raman spectroscopy method is a novel experimental approach to determine the P-T stability conditions of methane hydrates. The method is fast compared to conventional methods, and has the potential to be applied to study other gas hydrate systems.en
dc.description.degreePh. D.en
dc.identifier.otheretd-10062005-222419en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10062005-222419/en
dc.identifier.urihttp://hdl.handle.net/10919/29205en
dc.publisherVirginia Techen
dc.relation.haspartFLin_Dissertation.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectsynthetic fluid inclusionsen
dc.subjectRaman spectroscopyen
dc.subjectmethane hydrateen
dc.subjectH₂O-CH₄ systemen
dc.subjectPVTX propertiesen
dc.subjectphase equilibriaen
dc.titleExperimental Study of the PVTX Properties of the System H₂O-CH₄en
dc.typeDissertationen
thesis.degree.disciplineGeosciencesen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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