georefid:2002-014388SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=2002-014388<gco:CharacterString>Velocity to porosity transform in marine sediments</gco:CharacterString>2001-01-01publicationgeorefid:2002-014388Prasad, ManikaStanford University, Department of Geophysics, Stanford, CA, United StatesauthorDvorkin, JackauthorSociety of Professional Well Log Analysts, Houston, TX, United StatespublisherdocumentHardcopyPetrophysics (Houston, Tex.)42 (5)429-437We apply a new effective medium model for calculating elastic moduli of high-porosity ocean-bottom sediments to several Ocean Drilling Program (ODP) well log data sets from offshore Amazon delta, Peru margin, and Bengal Bay. The model relates the bulk and shear elastic moduli of the sediment to porosity, differential pressure, elastic constants of the grains, and pore-fluid compressibility. As a result, we can accurately match sonic well log data using porosity and differential pressure as the main inputs. Therefore, velocity data can be used to infer porosity and pressure.completedEngineering geologyAmazon FanAtlantic OceanBay of Bengalbulk densitybulk moduluscompressibilityelastic constantsequationsHertz-Mindlin equationIndian OceanLeg 112Leg 116Leg 155marine sedimentsmineral compositionmodelsNorth AtlanticOcean Drilling ProgramODP Site 679ODP Site 719ODP Site 931ODP Site 933ODP Site 940ODP Site 946Peruporositypressurepropertiessedimentsshear modulussoil mechanicsSouth Americavelocitywell logsurn:org.iodp:exp:112urnlargerWorkCitationcampaignurn:org.iodp:exp:116urnlargerWorkCitationcampaignurn:org.iodp:exp:155urnlargerWorkCitationcampaignurn:org.iodp:exp:112:site:679urnlargerWorkCitationstudyurn:org.iodp:exp:112urnlargerWorkCitationcampaignurn:org.iodp:exp:116:site:719urnlargerWorkCitationstudyurn:org.iodp:exp:116urnlargerWorkCitationcampaignurn:org.iodp:exp:155:site:931urnlargerWorkCitationstudyurn:org.iodp:exp:155urnlargerWorkCitationcampaignurn:org.iodp:exp:155:site:933urnlargerWorkCitationstudyurn:org.iodp:exp:155urnlargerWorkCitationcampaignurn:org.iodp:exp:155:site:940urnlargerWorkCitationstudyurn:org.iodp:exp:155urnlargerWorkCitationcampaignurn:org.iodp:exp:155:site:946urnlargerWorkCitationstudyurn:org.iodp:exp:155urnlargerWorkCitationcampaignEnglishgeoscientificInformation-78.161881.2358-11.03486.5658Includes appendix