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

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doi: 10.2204/iodp.pr.308.2005
Author(s): Flemings, Peter B.; Behrmann, Jan H.; John, Cédric M.; Iturrino, Gerardo J.; Aizawa, Yasutaka; Nguyen Thi Thanh Binh; de Silva, Neil; Dugan, Brandon; Edeskar, Tommy M.; Franke, Christine; Gay, Aurélien; Gilhooly, William Patrick, III; Gutierrez-Pastor, Julia; Jiang Shao-Yong; Li Qianyu; Long, Hui; Moore, J. Casey; Nunoura, Takuro; Pirmez, Carlos; Reichow, Marc; Sawyer, Derek E.; Schneider, Julia; Shumnyk, Anatoliy V.; Suzuki, Takahiro; Takano, Yoshinori; Urgeles, Roger; Yamamoto, Yuzuru; Zampetti, Valentina
Integrated Ocean Drilling Program, Expedition 308 Scientists, Colege Station, TX
Author Affiliation(s): Primary:
Pennsylvania State University, Department of Geosciences, University Park, PA, United States
Other:
Albert-Ludwigs-Universität Freiburg, Federal Republic of Germany
University of California-Santa Cruz, United States
Lamont-Doherty Earth Observatory, United States
Kyoto University, Japan
University of Tokyo, Japan
Rice University, United States
Lulea University of Technology, Sweden
Universität Bremen, Federal Republic of Germany
Southampton Oceanography Centre, United Kingdom
University of Virginia, United States
Universidad de Granada, Spain
Nanjing University, China
Tongji University, China
Japan Agency for Marine-Earth Science and Technology, Japan
Shell International Exploration and Production, United States
University of Leicester, United Kingdom
Florida State University, United States
University of Tsukuba, Japan
Hokkaido University, Japan
Universidad de Barcelona, Spain
Shizuoka University, Japan
Vrije Universiteit, Netherlands
Source: Preliminary Report (Integrated Ocean Drilling Program), Vol.308, 1098p. Publisher: IODP Management International, College Station, TX, United States. ISSN: 1932-9423
Note: In English. 35 refs.
Summary: 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.
Year of Publication: 2005
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 07 Marine Geology and Oceanography; 20 Geophysics, Applied; 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; IODP Site U1319; IODP Site U1320; IODP Site U1321; IODP Site U1322; IODP Site U1323; IODP Site U1324; Integrated Ocean Drilling Program; 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
Coordinates: N271500 N280600 W0890000 W0942500
Record ID: 2008016936
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