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M. Nafi Toksöz. Chen, Wei Massachusetts Institute of Technology. Dept. of Earth, Atmospheric, and Planetary Sciences. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences 2010-09-01T16:20:26Z 2010-09-01T16:20:26Z 1999 1999 http://hdl.handle.net/1721.1/58060 45048061 Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1999. Includes bibliographical references (leaves 41-45). The estimation of formation permeability from full waveform acoustic and nuclear magnetic resonance (NMR) logs in petroleum well logging has improved significantly in recent years. In this thesis, we review the methods of permeability estimation from Stoneley waves and provide permeability comparisons between acoustic and NMR logs. When a Stoneley wave travels along a permeable formation, hydraulic exchange between the Stoneley wave and formation will occur. As a result, Stoneley wave travel time will be delayed and the Stoneley wave attenuation will increase, causing a centroid frequency shift. Therefore, these two wave attributes can be used to estimate formation permeability. NMR logging data can also be used to estimate permeability. Permeability estimates using Stoneley waves and NMR logging were tested using data from a section consisting of sandstone and shale beds. The permeability results show very good correlation for these two different methods. Data from a gas zone that is analyzed shows high permeability values from acoustic data and low values from NMR. The difference between these two permeability results can be used as a gas zone indicator. by Wei Chen. S.M. 45 leaves eng Massachusetts Institute of Technology M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 Earth, Atmospheric, and Planetary Sciences. In-situ permeability estimation : a comparison between acoustic and NMR logs In-situ permeability estimation : a comparison between acoustic and nuclear magnetic resonance logs Thesis application/pdf false Publication unknown unknown <Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="c7a4ad8d-11e2-4394-bf8a-b342ffa74dc0"> <Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type> <Language>eng</Language> <Title>In-situ permeability estimation : a comparison between acoustic and NMR logs</Title> <Subtitle>In-situ permeability estimation : a comparison between acoustic and nuclear magnetic resonance logs</Subtitle> <PublishedIn> <Publication> </Publication> </PublishedIn> <PublicationDate>1999</PublicationDate> <Authors> <Author> <DisplayName>Chen, Wei</DisplayName> <Affiliation> <OrgUnit> </OrgUnit> </Affiliation> </Author> </Authors> <Editors> </Editors> <Publishers> <Publisher> <DisplayName>Massachusetts Institute of Technology</DisplayName> <OrgUnit /> </Publisher> </Publishers> <License>http://dspace.mit.edu/handle/1721.1/7582</License> <Keyword>Earth, Atmospheric, and Planetary Sciences.</Keyword> <Abstract>The estimation of formation permeability from full waveform acoustic and nuclear magnetic resonance (NMR) logs in petroleum well logging has improved significantly in recent years. In this thesis, we review the methods of permeability estimation from Stoneley waves and provide permeability comparisons between acoustic and NMR logs. When a Stoneley wave travels along a permeable formation, hydraulic exchange between the Stoneley wave and formation will occur. As a result, Stoneley wave travel time will be delayed and the Stoneley wave attenuation will increase, causing a centroid frequency shift. Therefore, these two wave attributes can be used to estimate formation permeability. NMR logging data can also be used to estimate permeability. Permeability estimates using Stoneley waves and NMR logging were tested using data from a section consisting of sandstone and shale beds. The permeability results show very good correlation for these two different methods. Data from a gas zone that is analyzed shows high permeability values from acoustic data and low values from NMR. The difference between these two permeability results can be used as a gas zone indicator.</Abstract> <Access xmlns="http://purl.org/coar/access_right" > </Access> </Publication>