Timothy S Collett
Dr. Collett provides science leadership and management oversight within the Energy Resources Program (ERP) funded tasks in the USGS Gas Hydrate Project, which include the (1) North Slope of Alaska Gas Hydrate Energy Production Research Task, (2) Gas Hydrate Energy Assessment Task, (3) International Gas Hydrate Research and Science Advisor Task, and the (4) Gulf of Mexico Gas Hydrate Task.
Dr. Collett has been a research geologist in the U.S. Geological Survey (USGS) since 1983. Tim received a B.S. in geology from Michigan State University, a M.S. in geology from the University of Alaska, and a Ph.D. in geology from the Colorado School of Mines. Tim is the Project Chief of the Energy Resources Program funded gas hydrate research efforts in the USGS. He has received the Department of the Interior Meritorious Service Award and the Golomb-Chilinger Medal from the Russian Academy of Natural Sciences and the Natural Resources of Canada Public Service Award. Tim has been the Chief and Co-Chief Scientist of numerous domestic and international gas hydrate scientific and industrial drilling expeditions and programs. He has been the Co-Chief Scientists and Operational Manager for the India NGHP Expedition 01 and 02 gas hydrate drilling and testing projects. Tim was a Co-Chief Scientist of the international cooperative gas hydrate research project that was responsible for drilling dedicated gas hydrate production research wells in the Mackenzie Delta of Canada under the Mallik 1998 and 2002 efforts. Tim was the logging scientist on the Gulf of Mexico JIP Gas Hydrate Research Expedition in 2005 and is the Co-Chief Scientist of the Integrated Ocean Drilling Program (IODP) Expedition 311, and the Gulf of Mexico JIP Leg II drilling project in 2009. He sailed as a science advisor on the Korean UBGH2 Expedition in 2010 and the 2017 University of Texas Gulf of Mexico 2-1 Hydrate Pressure Coring Expedition. Tim was also the Principal Investigator responsible for organizing and conducting the 1995 and 2008 USGS National Oil and Gas Assessment of natural gas hydrates. Tim is an Adjunct Professor in the Department of Geophysics at the Colorado School of Mines. Tim’s current research efforts in the USGS deal mostly with domestic and international gas hydrate energy resource characterization studies. His ongoing gas hydrate assessment activities in Alaska are focused on assessing the energy resource potential of gas hydrates on the North Slope. Tim’s international gas hydrate activities include cooperative projects with research partners in India, Korea, Japan, China, and Canada. Tim also continues to represent the USGS gas hydrate interest in the Gulf of Mexico through a U.S. Department of Energy cooperative. Tim has published more than 250 research papers along with 10 books and treatises on gas hydrates and other unconventional resources.
Professional Experience
U.S. Geological Survey (USGS) Research Geologist 1983-present
Education and Certifications
B.S. in geology from Michigan State University
M.S. in geology from the University of Alaska
Ph.D. in geology from the Colorado School of Mines
Science and Products
Gas hydrate saturations estimated from fractured reservoir at Site NGHP-01-10, Krishna-Godavari Basin, India
Scientific objectives of the Gulf of Mexico gas hydrate JIP leg II drilling
Site selection for DOE/JIP gas hydrate drilling in the northern Gulf of Mexico
Assessing gas-hydrate prospects on the North Slope of Alaska—Theoretical considerations
Assessment of gas hydrate resources on the North Slope, Alaska, 2008
Methane hydrates
Physical properties of sediments from Keathley Canyon and Atwater Valley, JIP Gulf of Mexico gas hydrate drilling program
Methane hydrate formation in turbidite sediments of northern Cascadia, IODP Expedition 311
Integrated analysis of well logs and seismic data to estimate gas hydrate concentrations at Keathley Canyon, Gulf of Mexico
Toward production from gas hydrates: Current status, assessment of resources, and simulation-based evaluation of technology and potential
Using open hole and cased-hole resistivity logs to monitor gas hydrate dissociation during a thermal test in the mallik 5L-38 research well, Mackenzie Delta, Canada
Geologic framework of the 2005 Keathley Canyon gas hydrate research well, northern Gulf of Mexico
Science and Products
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Gas hydrate saturations estimated from fractured reservoir at Site NGHP-01-10, Krishna-Godavari Basin, India
During the Indian National Gas Hydrate Program Expedition 01 (NGHP-Ol), one of the richest marine gas hydrate accumulations was discovered at Site NGHP-01-10 in the Krishna-Godavari Basin. The occurrence of concentrated gas hydrate at this site is primarily controlled by the presence of fractures. Assuming the resistivity of gas hydratebearing sediments is isotropic, th?? conventional Archie analyAuthorsM. W. Lee, T. S. CollettScientific objectives of the Gulf of Mexico gas hydrate JIP leg II drilling
The Gulf of Mexico Methane Hydrate Joint Industry Project (JIP) has been performing research on marine gas hydrates since 2001 and is sponsored by both the JIP members and the U.S. Department of Energy. In 2005, the JIP drilled the Atwater Valley and Keathley Canyon exploration blocks in the Gulf of Mexico to acquire downhole logs and recover cores in silt- and clay-dominated sediments interpretedAuthorsEmrys Jones, T. Latham, Daniel R. McConnell, Matthew Frye, J.H. Hunt, William Shedd, Dianna Shelander, Ray Boswell, Kelly K. Rose, Carolyn D. Ruppel, Deborah R. Hutchinson, Timothy S. Collett, Brandon Dugan, Warren T. WoodSite selection for DOE/JIP gas hydrate drilling in the northern Gulf of Mexico
n the late spring of 2008, the Chevron-led Gulf of Mexico Gas Hydrate Joint Industry Project (JIP) expects to conduct an exploratory drilling and logging campaign to better understand gas hydrate-bearing sands in the deepwater Gulf of Mexico. The JIP Site Selection team selected three areas to test alternative geological models and geophysical interpretations supporting the existence of potentialAuthorsDeborah Hutchinson, Dianna Shelander, J. Dai, D. McConnell, William Shedd, Matthew Frye, Carolyn D. Ruppel, R. Boswell, Emrys Jones, Timothy S. Collett, Kelly K. Rose, Brandon Dugan, Warren T. WoodAssessing gas-hydrate prospects on the North Slope of Alaska—Theoretical considerations
Gas-hydrate resource assessment on the Alaska North Slope using 3-D and 2-D seismic data involved six important steps: (1) determining the top and base of the gas-hydrate stability zone, (2) 'tying' well log information to seismic data through synthetic seismograms, (3) differentiating ice from gas hydrate in the permafrost interval, (4) developing an acoustic model for the reservoir and seal, (5)AuthorsMyung W. Lee, Timothy S. Collett, Warren F. AgenaAssessment of gas hydrate resources on the North Slope, Alaska, 2008
The U.S. Geological Survey (USGS) recently completed the first assessment of the undiscovered technically recoverable gas-hydrate resources on the North Slope of Alaska. Using a geology-based assessment methodology, the USGS estimates that there are about 85 trillion cubic feet (TCF) of undiscovered, technically recoverable gas resources within gas hydrates in northern Alaska.AuthorsTimothy S. Collett, Warren F. Agena, Myung W. Lee, Margarita V. Zyrianova, Kenneth J. Bird, Ronald R. Charpentier, Troy Cook, David W. Houseknecht, Timothy R. Klett, Richard M. Pollastro, Christopher J. SchenkMethane hydrates
Gas hydrate is a solid, naturally occurring substance consisting predominantly of methane gas and water. Recent scientific drilling programs in Japan, Canada, the United States, Korea and India have demonstrated that gas hydrate occurs broadly and in a variety of forms in shallow sediments of the outer continental shelves and in Arctic regions. Field, laboratory and numerical modelling studies conAuthorsRay Boswell, Koji Yamamoto, Sung-Rock Lee, Timothy S. Collett, Pushpendra Kumar, Scott DallimorePhysical properties of sediments from Keathley Canyon and Atwater Valley, JIP Gulf of Mexico gas hydrate drilling program
Physical property measurements and consolidation behavior are different between sediments from Atwater Valley and Keathley Canyon in the northern Gulf of Mexico. Void ratio and bulk density of Atwater Valley sediment from a seafloor mound (holes ATM1 and ATM2) show little effective stress (or depth) dependence to 27 meters below seafloor (mbsf), perhaps owing to fluidized transport through the mouAuthorsWilliam J. Winters, Brandon Dugan, Timothy S. CollettMethane hydrate formation in turbidite sediments of northern Cascadia, IODP Expedition 311
Expedition 311 of the Integrated Ocean Drilling Program (IODP) to northern Cascadia recovered gas-hydrate bearing sediments along a SW-NE transect from the first ridge of the accretionary margin to the eastward limit of gas-hydrate stability. In this study we contrast the gas gas-hydrate distribution from two sites drilled ~ 8??km apart in different tectonic settings. At Site U1325, drilled on a dAuthorsM.E. Torres, A.M. Trehu, N. Cespedes, M. Kastner, U.G. Wortmann, J.-H. Kim, P. Long, A. Malinverno, J. W. Pohlman, M. Riedel, T. CollettIntegrated analysis of well logs and seismic data to estimate gas hydrate concentrations at Keathley Canyon, Gulf of Mexico
Accurately detecting and quantifying gas hydrate or free gas in sediments from seismic data require downhole well-log data to calibrate the physical properties of the gas hydrate-/free gas-bearing sediments. As part of the Gulf of Mexico Joint Industry Program, a series of wells were either cored or drilled in the Gulf of Mexico to characterize the physical properties of gas hydrate-bearing sedimeAuthorsM. W. Lee, T. S. CollettToward production from gas hydrates: Current status, assessment of resources, and simulation-based evaluation of technology and potential
Gas hydrates are a vast energy resource with global distribution in the permafrost and in the oceans. Even if conservative estimates are considered and only a small fraction is recoverable, the sheer size of the resource is so large that it demands evaluation as a potential energy source. In this review paper, we discuss the distribution of natural gas hydrate accumulations, the status of the primAuthorsG. J. Moridis, T. S. Collett, R. Boswell, M. Kurihara, M. T. Reagan, C. Koh, E. D. SloanUsing open hole and cased-hole resistivity logs to monitor gas hydrate dissociation during a thermal test in the mallik 5L-38 research well, Mackenzie Delta, Canada
Gas hydrates, which are naturally occurring ice-like combinations of gas and water, have the potential to provide vast amounts of natural gas from the world's oceans and polar regions. However, producing gas economically from hydrates entails major technical challenges. Proposed recovery methods such as dissociating or melting gas hydrates by heating or depressurization are currently being tested.AuthorsB.I. Anderson, T. S. Collett, R.E. Lewis, I. DubourgGeologic framework of the 2005 Keathley Canyon gas hydrate research well, northern Gulf of Mexico
The Keathley Canyon sites drilled in 2005 by the Chevron Joint Industry Project are located along the southeastern edge of an intraslope minibasin (Casey basin) in the northern Gulf of Mexico at 1335 m water depth. Around the drill sites, a grid of 2D high-resolution multichannel seismic data designed to image depths down to at least 1000 m sub-bottom reveals 7 unconformities and disconformities tAuthorsD. R. Hutchinson, P. E. Hart, T. S. Collett, K.M. Edwards, D. C. Twichell, F. Snyder - News