Publications
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Advanced distributed acoustic sensing vertical seismic profile imaging of an Alaska North Slope gas hydrate field
Gas hydrates are found in significant quantities on the North Slope of Alaska in subpermafrost sand units and intermixed in lower portions of permafrost within the hydrate stability window. While conventional surface seismic data and established imaging methods can indicate the presence of gas hydrate reservoirs, producing high-resolution images of (seismically) thin layers remains challenging due
Authors
Cullen Young, Jeffrey Shragge, Whitney Shultz, Seth S. Haines, Can Oren, James Simmons, Timothy Collett
Planning and operations of the Hydrate 01 Stratigraphic Test Well, Prudhoe Bay Unit, Alaska North Slope
The National Energy Technology Laboratory, the Japan Oil, Gas and Metals National Corporation, and the U.S. Geological Survey are leading an effort to conduct an extended gas hydrate production test in northern Alaska. The proposed production test required the drilling of an initial stratigraphic test well (STW) to confirm the geologic conditions of the proposed test site. This well was completed
Authors
Timothy S. Collett, Margarita V. Zyrianova, Norihiro Okinaka, Motoi Wakatsuki, Ray Boswell, Scott Marsteller, David Minge, Stephen Crumley, David Itter, Robert D. Hunter, Ana Garcia-Ceballos, Ge Jin
The Denver Well Logging Society March 2022 Newsletter: From the VP - Technology
No abstract available.
Authors
Jenny H. Lagesse
The Coles Hill uranium deposit, Virginia, USA: Geology, geochemistry, geochronology, and genetic model
The Coles Hill uranium deposit with an indicated resource of about 130 million lbs. of U3O8 is the largest unmined uranium deposit in the United States. The deposit is hosted in the Taconian (approximately 480 – 450 Ma) Martinsville igneous complex, which consists of the Ordovician Leatherwood Granite (granodiorite) and Silurian Rich Acres Formation (diorite). The host rock was metamorphosed to or
Authors
Susan M. Hall, J.S. Beard, Christopher J. Potter, R.J. Bodnar, Leonid A. Neymark, James B. Paces, Craig A. Johnson, G.N. Breit, Robert A. Zielinski, G. J. Aylor
Gas hydrate saturation estimates, gas hydrate occurrence, and reservoir characteristics based on well log data from the hydrate-01 stratigraphic test well, Alaska North Slope
The Hydrate-01 Stratigraphic Test Well was drilled at the Kuparuk 7-11-12 site on the Alaska North Slope in December 2018. Sonic log data provide compressional (P) and shear (S) slowness from which we determine gas hydrate saturation (Sgh) estimates using effective medium theory. The sonic Sgh estimates compare favorably with Sgh estimated from resistivity and nuclear magnetic resonance (NMR) logs
Authors
Seth S. Haines, Timothy Collett, Jun Yoneda, Naoyuki Shimoda, Ray Boswell, Norihiro Okinaka
New insights into the occurrence and implications of mobile water in gas hydrate systems
Gas hydrate production technologies commonly feature reservoir depressurization. Depressurization occurs when a pressure gradient is established in a well, drawing mobile water from the reservoir and reducing reservoir pressure. As such, the occurrence of mobile water is a necessary condition for effective gas production from gas hydrate reservoirs using common borehole-based methods. However, rec
Authors
Ray Boswell, Koji Yamamoto, Machiko Tamaki, Timothy S. Collett, George Moridis, Evgeniy Myshakin
Permeability measurement and prediction with nuclear magnetic resonance analysis of gas hydrate-bearing sediments recovered from Alaska North Slope 2018 Hydrate-01 Stratigraphic Test Well
Permeability of porous media, such as oil and gas reservoirs, is the crucial material parameter for predicting their hydraulic behavior. A nuclear magnetic resonance (NMR) analyzer is widely used as a powerful tool to predict permeability of various media. NMR T2 (transverse or spin–spin) relaxation time distribution, which is related to pore size distribution, gives the information to allow calcu
Authors
Jun Yoneda, Kiyofumi Suzuki, Yusuke Jin, Satoshi Ohtsuki, Timothy S. Collett, Ray Boswell, Yuki Maehara, Norihiro Okinaka
The Denver Well Logging Society February 2022 Newsletter: From the VP - Technology
No abstract available.
Authors
Jenny Heather Lagesse
Development of hydrocarbon gas standards for stable isotopic composition (δ13C and δ2H)
A suite of gas standards was developed to serve as international secondary reference materials (RMs) for the determination of the compound-specific carbon-13/carbon-12 (δ13C) and hydrogen-2/hydrogen-1 (δ2H) values of hydrocarbon gases. This report provides background information on the project, the methods used to produce and analyze the gases, as well as the data analysis and recommended stable i
Authors
Geoffrey S. Ellis, Robert F. Dias