georefid:2007-088834SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.2204/iodp.sp.308.2005<gco:CharacterString>Integrated Ocean Drilling Program, Expedition 308 scientific prospectus; Gulf of Mexico hydrogeology; overpressure and fluid flow processes in the deepwater Gulf of Mexico; slope stability, seeps, and shallow-water flow</gco:CharacterString>2005-01-01publicationgeorefid:2007-088834issn:1932-9415doi:10.2204/iodp.sp.308.2005Flemings, Peter B.Pennsylvania State University, Department of Geosciences, University Park, PA, United StatesauthorBehrmann, Jan H.Albert-Ludwigs-Universitaet Freiburg, Federal Republic of GermanyauthorJohn, CedricUniversity of California, Santa Cruz, United StatesauthorIODP Management International, College Station, TX, United StatespublisherdocumentDigitalScientific Prospectus (Integrated Ocean Drilling Program)30852 pp.1932-9415Integrated Ocean Drilling Program Expedition 308 is an abbreviated form of Proposal 589-Full 3 entitled "Overpressure and Fluid Flow Processes in the Deepwater Gulf of Mexico: Slope Stability, Seeps, and Shallow Water Flow". We will explore the coupling of overpressure, flow, and deformation in passive margin settings. We will test a multidimensional flow model by examining how physical properties, pressure, temperature, and pore fluid composition vary within low-permeability mudstones that overlie a permeable and overpressured aquifer. Drilling, logging, and in situ measurements will be performed in the Brazos-Trinity #4 minibasin and in the Ursa region of the northern Gulf of Mexico. These basins are 300 km apart and have experienced very different Pleistocene sedimentation histories. Brazos-Trinity #4 will serve as a reference location because its low sedimentation rate generated little overpressure. In contrast, Ursa experienced extreme sedimentation rates, has high overpressures, and will serve as a type location to study overpressure and flow. Drilling and consequent postcruise studies will illuminate controls on slope stability, seafloor seeps, and large-scale crustal fluid flow. Two key components of the experimental plan are to take substantial whole-core geotechnical samples for later shore-based analysis and to deploy a tapered penetrometer, the T2P probe (developed jointly between the Massachusetts Institute of Technology [MIT; USA], the Pennsylvania State University [USA], and IODP) to measure in situ pressure and temperature. Expedition 308 science will meet many of the objectives proposed in the original IODP Proposal 589-Full3 and will provide the foundation to implement long-term in situ monitoring experiments in the aquifer and bounding mudstones in a future expedition to meet the full objectives of IODP Proposal 589-Full3.completedHydrogeologyQuaternary geologyApplied geophysicsaquifersAtlantic OceanboreholesBrazos-Trinity BasinCenozoiccirculationcontinental margincontinental slopecoresdata acquisitiondata processingdownhole methodsdrillingExpedition 308expeditionsflowsfluid phasegeophysical methodsgeophysical profilesgeophysical surveysground waterGulf of MexicohydrodynamicsIntegrated Ocean Drilling ProgramLouisianamarine drillingmarine sedimentsMars-Ursa Basinmass movementsNorth Atlanticnorthern Gulf of Mexicooverpressureplanningpore pressureQuaternarysamplingsedimentsseismic methodsseismic profilesseismic stratigraphyslope stabilityslumpingsurveysTexasUnited Stateswell-loggingurn:org.iodp:exp:308urnlargerWorkCitationcampaignEnglishgeoscientificInformation-94.2500-89.000027.150028.0600Includes appendicesapplication/pdfunknownSEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContacthttp://publications.iodp.org/scientific_prospectus/308/308SP.PDFdownload