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
A method of Shaly sand correction for estimating gas hydrate saturations using downhole electrical resistivity log data
Estimates of in situ gas hydrate concentration from resistivity monitoring of gas hydrate bearing sediments during temperature equilibration
Gas hydrate transect across northern Cascadia margin
Controls on the physical properties of gas-hydrate-bearing sediments because of the interaction between gas hydrate and porous media
Results at Mallik highlight progress in gas hydrate energy resource research and development
Scientific results from the Mallik 2002 gas hydrate production research well program, Mackenzie Delta, northwest territories, Canada: Preface
Three-dimensional distribution of gas hydrate beneath southern Hydrate Ridge: Constraints from ODP Leg 204
Numerical studies of gas production from several CH4 hydrate zones at the Mallik site, Mackenzie Delta, Canada
Geochemistry of natural gas, North Slope, Alaska: Implications for gas resources, NPRA
Energy resource potential of natural gas hydrates
Relationship of gas hydrate concentration to porosity and reflection amplitude in a research well, Mackenzie Delta, Canada
Science and Products
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A method of Shaly sand correction for estimating gas hydrate saturations using downhole electrical resistivity log data
Estimation of the amount of nonconductive and conductive constituents in the pore space of sediments, using electrical resistivity logs, generally loses accuracy when clays are present in the reservoir. Many different methods and clay models have been proposed to account for the conductivity of clay (for example, the shaly sand correction). In this study, the Simandoux model is employed to correctAuthorsMyung W. Lee, Timothy S. CollettEstimates of in situ gas hydrate concentration from resistivity monitoring of gas hydrate bearing sediments during temperature equilibration
As part of Ocean Drilling Program Leg 204 at southern Hydrate Ridge off Oregon we have monitored changes in sediment electrical resistivity during controlled gas hydrate dissociation experiments. Two cores were used, each filled with gas hydrate bearing sediments (predominantly mud/silty mud). One core was from Site 1249 (1249F-9H3), 42.1 m below seafloor (mbsf) and the other from Site 1248 (1248CAuthorsM. Riedel, P.E. Long, T. S. CollettGas hydrate transect across northern Cascadia margin
Gas hydrate is a solid compound mainly comprised of methane and water that is stable under low temperature and high pressure conditions. Usually found in offshore environments with water depths exceeding about 500 meters and in arctic regions associated with permafrost, gas hydrates form an efficient storage system for natural gas. Hence, they may represent an important future energy resource [e.gAuthorsM. Riedel, T. Collett, M. Malone, F. Akiba, M. Blanc-Valleron, M. Ellis, G. Guerin, Y. Hashimoto, V. Heuer, Y. Higashi, M. Holland, P. Jackson, M. Kaneko, M. Kastner, J.-H. Kim, H. Kitajima, P. Long, A. Malinverno, Gwen E. Myers, L. Palekar, J. Pohlman, P. Schultheiss, B. Teichert, M. Torres, A. Tréhu, Jingyuan Wang, U. Worthmann, H. YoshiokaControls on the physical properties of gas-hydrate-bearing sediments because of the interaction between gas hydrate and porous media
Physical properties of gas-hydrate-bearing sediments depend on the pore-scale interaction between gas hydrate and porous media as well as the amount of gas hydrate present. Well log measurements such as proton nuclear magnetic resonance (NMR) relaxation and electromagnetic propagation tool (EPT) techniques depend primarily on the bulk volume of gas hydrate in the pore space irrespective of the porAuthorsMyung W. Lee, Timothy S. CollettResults at Mallik highlight progress in gas hydrate energy resource research and development
The recent studies that project the role of gas hydrates in the future energy resource management are reviewed. Researchers have long speculated that gas hydrates could eventually be a commercial resource for the future. A Joint Industry Project led by ChevronTexaco and the US Department of Energy is designed to characterize gas hydrates in the Gulf of Mexico. Countries including Japan, canada, anAuthorsT. S. CollettScientific results from the Mallik 2002 gas hydrate production research well program, Mackenzie Delta, northwest territories, Canada: Preface
[No abstract available]AuthorsS.R. Dallimore, T. S. Collett, A.E. Taylor, T. Uchida, M. Weber, A. Chandra, T.H. Mroz, E.M. Caddel, T. InoueThree-dimensional distribution of gas hydrate beneath southern Hydrate Ridge: Constraints from ODP Leg 204
Large uncertainties about the energy resource potential and role in global climate change of gas hydrates result from uncertainty about how much hydrate is contained in marine sediments. During Leg 204 of the Ocean Drilling Program (ODP) to the accretionary complex of the Cascadia subduction zone, we sampled the gas hydrate stability zone (GHSZ) from the seafloor to its base in contrasting geologiAuthorsA.M. Trehu, P.E. Long, M.E. Torres, G. Bohrmann, F.R. Rack, T. S. Collett, D.S. Goldberg, A.V. Milkov, M. Riedel, P. Schultheiss, N.L. Bangs, S. R. Barr, W.S. Borowski, G. E. Claypool, M.E. Delwiche, G.R. Dickens, E. Gracia, G. Guerin, M. Holland, J.E. Johnson, Y.-J. Lee, C.-S. Liu, X. Su, B. Teichert, H. Tomaru, M. Vanneste, M. E. Watanabe, J.L. WeinbergerNumerical studies of gas production from several CH4 hydrate zones at the Mallik site, Mackenzie Delta, Canada
The Mallik site represents an onshore permafrost-associated gas hydrate accumulation in the Mackenzie Delta, Northwest Territories, Canada. A gas hydrate research well was drilled at the site in 1998. The objective of this study is the analysis of various gas production scenarios from five methane hydrate-bearing zones at the Mallik site. In Zone #1, numerical simulations using the EOSHYDR2 modelAuthorsG. J. Moridis, T. S. Collett, S.R. Dallimore, T. Satoh, S. Hancock, B. WeatherillGeochemistry of natural gas, North Slope, Alaska: Implications for gas resources, NPRA
No abstract available.AuthorsRobert A. Burruss, Paul G. Lillis, Timothy S. CollettEnergy resource potential of natural gas hydrates
The discovery of large gas hydrate accumulations in terrestrial permafrost regions of the Arctic and beneath the sea along the outer continental margins of the world's oceans has heightened interest in gas hydrates as a possible energy resource. However, significant to potentially insurmountable technical issues must be resolved be fore gas hydrates can be considered a viable option for affordableAuthorsT. S. CollettRelationship of gas hydrate concentration to porosity and reflection amplitude in a research well, Mackenzie Delta, Canada
Well logs acquired at the Mallik 2L-38 gas hydrate research well. Mackenzie Delta, Canada, reveal a distinct trend showing that the resistivity of gas-hydrate-bearing sediments increases with increases in density porosities. This trend, opposite to the general trend of decrease in resistivity with porosity, implies that gas hydrates are more concentrated in the higher porosity. Using the Mallik 2LAuthorsY.K. Jin, M. W. Lee, T. S. Collett - News