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DTSTART:20220331T070000Z
DTEND:20220331T080000Z
SUMMARY:CERE seminar by Leonardo Teixeira Pinto Meireles
DESCRIPTION:<p style="margin: 0cm 0cm 8pt;"><span style="color: #1f497d;">Lab assessment of NMR and resistivity derived porosity in shallow marine sediments</span></p>\n<p style="margin: 0cm 0cm 8pt;"><span style="color: #1f497d;">&nbsp;</span></p>\n<p style="margin: 0cm 0cm 8pt;"><span style="color: #1f497d;">Abstract:</span></p>\n<p style="margin: 0cm 0cm 8pt;"><span style="color: #1f497d;">A thorough characterization of geological and geotechnical parameters must be conducted for the design and execution of offshore wind turbine foundations.</span></p>\n<p style="margin: 0cm 0cm 8pt;"><span style="color: #1f497d;">In doing so, deriving a good estimate of the porosity of shallow deposits is challenging. The possibility of a stuck tool in an unconsolidated borehole makes the traditional gamma-gamma bulk density log prohibitive.</span></p>\n<p style="margin: 0cm 0cm 8pt;"><span style="color: #1f497d;">Also, laboratory measurements incur in a long waiting time, are costly, do not describe the whole borehole (point measurements, difficulty in sampling sands), and have a wide measurement spread (procedural inconsistencies in reconstituting samples).  <br />\n</span></p>\n<p style="margin: 0cm 0cm 8pt;"><span style="color: #1f497d;">In this context, a low-field nuclear magnetic resonance (NMR) tool could be used to generate continuous porosity logs along a borehole. In this study we investigated the feasibility of using NMR to characterize unconsolidated sediments by comparing its outputs with conventional lab methods for porosity. </span></p>\n<p style="margin: 0cm 0cm 8pt;"><span style="color: #1f497d;">As a possible alternative to NMR-derived porosity, which is not a particularly widespread technology in wireline logging and yet not available in cone penetration tests, we also derived porosity from electrical resistivity measurements, comparing accuracy and uncertainty of these two methods.<br />\n</span></p>
X-ALT-DESC;FMTTYPE=text/html:<p style="margin: 0cm 0cm 8pt;"><span style="color: #1f497d;">Lab assessment of NMR and resistivity derived porosity in shallow marine sediments</span></p>\n<p style="margin: 0cm 0cm 8pt;"><span style="color: #1f497d;">&nbsp;</span></p>\n<p style="margin: 0cm 0cm 8pt;"><span style="color: #1f497d;">Abstract:</span></p>\n<p style="margin: 0cm 0cm 8pt;"><span style="color: #1f497d;">A thorough characterization of geological and geotechnical parameters must be conducted for the design and execution of offshore wind turbine foundations.</span></p>\n<p style="margin: 0cm 0cm 8pt;"><span style="color: #1f497d;">In doing so, deriving a good estimate of the porosity of shallow deposits is challenging. The possibility of a stuck tool in an unconsolidated borehole makes the traditional gamma-gamma bulk density log prohibitive.</span></p>\n<p style="margin: 0cm 0cm 8pt;"><span style="color: #1f497d;">Also, laboratory measurements incur in a long waiting time, are costly, do not describe the whole borehole (point measurements, difficulty in sampling sands), and have a wide measurement spread (procedural inconsistencies in reconstituting samples).  <br />\n</span></p>\n<p style="margin: 0cm 0cm 8pt;"><span style="color: #1f497d;">In this context, a low-field nuclear magnetic resonance (NMR) tool could be used to generate continuous porosity logs along a borehole. In this study we investigated the feasibility of using NMR to characterize unconsolidated sediments by comparing its outputs with conventional lab methods for porosity. </span></p>\n<p style="margin: 0cm 0cm 8pt;"><span style="color: #1f497d;">As a possible alternative to NMR-derived porosity, which is not a particularly widespread technology in wireline logging and yet not available in cone penetration tests, we also derived porosity from electrical resistivity measurements, comparing accuracy and uncertainty of these two methods.<br />\n</span></p>

URL:https://www.cere.dtu.dk/calendar/2022/03/cere-seminar-by-leonardo-teixeira-pinto-meireles
DTSTAMP:20260516T083500Z
UID:{27BEEEAD-8EED-4C71-95CD-842175269CE0}-20220331T070000Z-20220331T070000Z
LOCATION: B229/R003
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