Estimation of Gas Hydrate and Free Gas Saturation, Concentration, and Distribution from Seismic Data

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dc.contributor.authorLu, Shaomingen_US
dc.contributor.authorMcMechan, George A.en_US
dc.contributor.utdAuthorLu, Shaomingen_US
dc.contributor.utdAuthorMcMechan, George A.en_US
dc.date.accessioned2018-08-24T21:12:49Z
dc.date.available2018-08-24T21:12:49Z
dc.date.created2002-03en_US
dc.date.issued2018-08-24
dc.description.abstractGas hydrates contain a major untapped source of energy and are of potential economic importance. The theoretical models to estimate gas hydrate saturation from seismic data predict significantly different acoustic/ elastic properties of sediments containing gas hydrate; we do not know which to use. Thus, we develop a new approach based on empirical relations. The water-filled porosity is calibrated (using well-log data) to acoustic impedance twice: one calibration where gas hydrate is present and the other where free gas is present. The water-filled porosity is used in a combination of Archie equations (with corresponding parameters for either gas hydrate or free gas) to estimate gas hydrate or free gas saturations. The method is applied to single-channel seismic data and well logs from Ocean Drilling Program leg 164 from the Blake Ridge area off the east coast of North America. The gas hydrate above the bottom simulating reflector (BSR) is estimated to occupy Ο3-8% of the pore space (Ο2-6% by volume). Free gas is interpreted to be present in three main layers beneath the BSR, with average gas saturations of 11-14%, 7-11%, and 1-5% of the pore space (6-8%, 4-6%, and 1-3% by volume), respectively. The estimated saturations of gas hydrate are very similar to those estimated from vertical seismic profile data and generally agree with those from independent, indirect estimates obtained from resistivity and chloride measurements. The estimated free gas saturations agree with measurements from a pressure core sampler. These results suggest that locally derived empirical relations between porosity and acoustic impedance can provide cost-effective estimates of the saturations, concentration, and distribution of gas hydrate and free gas away from control wells.en_US
dc.description.departmentSchool of Natural Sciences and Mathematicsen_US
dc.description.departmentCenter for Lithospheric Studiesen_US
dc.description.sponsorshipPetroleum Research Fund of the American Chemical Society grant 36706-AC.en_US
dc.identifier.bibliographicCitationLu, S., and G. A. McMechan. 2002. "Estimation of gas hydrate and free gas saturation, concentration, and distribution from seismic data." Geophysics 67(2): 582-593.en_US
dc.identifier.issn0016-8033en_US
dc.identifier.issue2en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/6025
dc.identifier.volume67en_US
dc.language.isoenen_US
dc.publisherSociety of Exploration Geophysicistsen_US
dc.relation.urihttp://dx.doi.org/10.1190/1.1468619
dc.rights©2002 Society of Exploration Geophysicistsen_US
dc.sourceGeophysics
dc.subjectAcoustic impedanceen_US
dc.subjectNatural gas—Hydratesen_US
dc.subjectPorosityen_US
dc.subjectSediments (Geology)en_US
dc.subjectSeismic prospectingen_US
dc.subjectCalibrationen_US
dc.subjectChlorine compoundsen_US
dc.subjectCost effectivenessen_US
dc.subjectGasesen_US
dc.subjectProspecting—Geophysical methodsen_US
dc.subjectGeophysicsen_US
dc.subjectHydrationen_US
dc.subjectGas well drillingen_US
dc.subjectParameter estimationen_US
dc.subjectSeismic wavesen_US
dc.subjectSeismologyen_US
dc.subjectGeophysical well loggingen_US
dc.subjectGas distributionen_US
dc.subjectGeophysics--Techniqueen_US
dc.subjectOcean Drilling Programen_US
dc.subjectVertical seismic profilingen_US
dc.subjectElasticityen_US
dc.subjectAtlantic oceanen_US
dc.titleEstimation of Gas Hydrate and Free Gas Saturation, Concentration, and Distribution from Seismic Dataen_US
dc.type.genrearticleen_US

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