georefid:2007-038750SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=2007-0387502006-01-01publicationgeorefid:2007-038750Goldberg, D.Lamont-Doherty Earth Observatory, Borehole Research Group, Palisades, NY, United StatesauthorMyers, G.Texas A&M University, United StatesauthorIturrino, G.Schlumberger Drilling and Measurements, United StatesauthorGrigar, K.authorPettigrew, T.authorMrozewski, S.authorGeological Society of London, London, United KingdompublisherdocumentHardcopyIn: Rothwell, R. Guy (editor), New techniques in sediment core analysis267219-228A newly developed logging-while-coring system was deployed during Ocean Drilling Program legs 204 and 209 off the coast of Oregon and near the Mid-Atlantic Ridge. The system consists of two existing devices modified to be used together--a Schlumberger Resistivity-at-the-Bit (super *) tool, and a Texas A&M University wireline-retrieved core barrel and latching tool. The combination allows for precise core-log depth calibration and core orientation within a single borehole, and without a pipe trip. These tests, conducted in clay-bearing sediments (Leg 204) and in crustal peridotite and gabbroic rocks (Leg 209), mark the first simultaneous use of coring and logging-while-drilling technologies. Sediment cores were recovered with 33% recovery, on average, and as high as 68% to 75 m depth below the sea floor. Core recovery in crustal rocks was only 1-2%, however, penetrating to 21 m depth below sea floor, which is attributed to a problem with the core catcher. High-resolution logs were recorded in the downhole tool memory over the entire drilled intervals at both test sites. It is anticipated that logging-while-coring systems will be utilized more routinely where rig time constraints may otherwise preclude coring in difficult drilling environments.completedApplied geophysicsAtlantic Oceancalibrationcontinental margincorescrustdrillingEast Pacificelectrical methodsgamma-ray methodsgeophysical methodshigh-resolution methodsigneous rocksLeg 204measurementMid-Atlantic RidgeOcean Drilling Programoceanic crustODP Site 1249OregonPacific Oceanperidotitesphysical propertiesplutonic rocksporosityrecoveryresistivitytechniquesultramaficsUnited Stateswell-loggingurn:org.iodp:exp:204urnlargerWorkCitationcampaignurn:org.iodp:exp:204:site:1249urnlargerWorkCitationstudyurn:org.iodp:exp:204urnlargerWorkCitationcampaignEnglishgeoscientificInformation-125.0900-125.040044.340044.3500