Flemings, Peter B. et al. (2005): Integrated Ocean Drilling Program Expedition 308 preliminary report; Gulf of Mexico hydrogeology; overpressure and fluid flow processes in the deepwater Gulf of Mexico; slope stability, seeps, and shallow-water flow

Leg/Site/Hole:
IODP 308
IODP 308 U1319
IODP 308 U1320
IODP 308 U1321
IODP 308 U1322
IODP 308 U1323
IODP 308 U1324
Identifier:
2008-016936
georefid

1932-9423
issn

10.2204/iodp.pr.308.2005
doi

Creator:
Flemings, Peter B.
Pennsylvania State University, Department of Geosciences, University Park, PA, United States
author

Behrmann, Jan H.
Albert-Ludwigs-Universitaet Freiburg, Federal Republic of Germany
author

John, Cedric M.
University of California-Santa Cruz, United States
author

Iturrino, Gerardo J.
Lamont-Doherty Earth Observatory, United States
author

Aizawa, Yasutaka
Kyoto University, Japan
author

Nguyen Thi Thanh Binh
University of Tokyo, Japan
author

de Silva, Neil
Rice University, United States
author

Dugan, Brandon
Lulea University of Technology, Sweden
author

Edeskar, Tommy M.
Universitaet Bremen, Federal Republic of Germany
author

Franke, Christine
Southampton Oceanography Centre, United Kingdom
author

Gay, Aurelien
University of Virginia, United States
author

Gilhooly, William Patrick, III
Universidad de Granada, Spain
author

Gutierrez-Pastor, Julia
Nanjing University, China
author

Jiang Shao-Yong
Tongji University, China
author

Li Qianyu
Japan Agency for Marine-Earth Science and Technology, Japan
author

Long, Hui
Shell International Exploration and Production, United States
author

Moore, J. Casey
University of Leicester, United Kingdom
author

Nunoura, Takuro
Florida State University, United States
author

Pirmez, Carlos
University of Tsukuba, Japan
author

Reichow, Marc
Hokkaido University, Japan
author

Sawyer, Derek E.
Universidad de Barcelona, Spain
author

Schneider, Julia
Shizuoka University, Japan
author

Shumnyk, Anatoliy V.
Vrije Universiteit, Netherlands
author

Suzuki, Takahiro
author

Takano, Yoshinori
author

Urgeles, Roger
author

Yamamoto, Yuzuru
author

Zampetti, Valentina
author

Identification:
Integrated Ocean Drilling Program Expedition 308 preliminary report; Gulf of Mexico hydrogeology; overpressure and fluid flow processes in the deepwater Gulf of Mexico; slope stability, seeps, and shallow-water flow
2005
Preliminary Report (Integrated Ocean Drilling Program)
IODP Management International, College Station, TX, United States
308
1098 pp.
Integrated Ocean Drilling Program (IODP) Expedition 308 is the first part of a two-component program dedicated to the study of overpressure and fluid flow on the Gulf of Mexico continental slope. We are examining how sedimentation, overpressure, fluid flow, and deformation are coupled in passive margin settings. Expedition 308 tested 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. We drilled, logged, and made in situ measurements in a reference location where little overpressure was deemed to be present: the Brazos-Trinity Basin. We contrasted these measurements with experiments performed in a region of very rapid Pleistocene sedimentation where overpressure is known to be present: the Ursa region of the northern Gulf of Mexico. Drilling documented severe overpressure in the Ursa region. Postcruise studies will illuminate controls on slope stability, seafloor seeps, and large-scale crustal fluid flow. Two key components of the experimental plan were to take substantial whole-core geotechnical samples for later shore-based analysis and to deploy the temperature and dual pressure probe (developed jointly between the Massachusetts Institute of Technology, Pennsylvania State University, and IODP at Texas A&M University) to measure in situ pressure. Expedition 308 science met many of the objectives proposed in the original IODP Proposal 589-Full3 and provided the foundation to implement long-term in situ monitoring experiments in the aquifer and bounding mudstones in a future expedition designed to meet the full objectives of IODP Proposal 589-Full3. An important achievement of Expedition 308 is to have successfully recorded in situ formation pressure and temperature in an overpressured basin. This is the first time that we know of that such measurements have been obtained.
English
Coverage:Geographic coordinates:
North:28.0600
West:-94.2500East: -89.0000
South:27.1500

Oceanography; Applied geophysics; Atlantic Ocean; biostratigraphy; boreholes; Brazos-Trinity Basin; Cenozoic; chronostratigraphy; continental slope; cores; correlation; currents; drilling; Expedition 308; flows; fluid phase; fluid pressure; geochemistry; geophysical methods; geophysical profiles; geophysical surveys; ground water; Gulf of Mexico; hydrochemistry; hydrodynamics; Integrated Ocean Drilling Program; IODP Site 1319; IODP Site 1320; IODP Site 1321; IODP Site 1322; IODP Site 1323; IODP Site 1324; lithofacies; lithostratigraphy; Louisiana; marine drilling; marine sedimentation; marine sediments; mass movements; microfossils; North Atlantic; northern Gulf of Mexico; overpressure; permeability; pore pressure; pore water; porosity; Quaternary; sea-level changes; sedimentation; sediments; seismic methods; seismic profiles; seismic stratigraphy; slope stability; slumping; submarine fans; surveys; Texas; turbidite; turbidity currents; United States; upper Quaternary; Ursa Basin; well logs;

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