X-ray Scanner for ODP Leg 204: Drilling Gas Hydrates on Hydrate Ridge, Cascadia Continental Margin

• Main Authors: Freifeld, Barry, Kneafsey, Tim, Pruess, Jacob, Reiter, Paul, Tomutsa, Liviu
• Other Authors: United States. Office of Natural Gas and Petroleum Technology.
• Format: Report
• Language: English
• Published: Lawrence Berkeley National Laboratory 2002
• Subjects: Resolution; Sediments; Gas Hydrates; Oregon; Hydrates; 58 Geosciences; Continental Margin; Design; Drilling; Fabrication; Distribution; Availability; Legs; Methane hydrate
• Online Access: https://doi.org/10.2172/803860; http://digital.library.unt.edu/ark:/67531/metadc733544/

An x-ray scanner was designed and fabricated at Lawrence Berkeley National Laboratory to provide high speed acquisition of x-ray images of sediment cores collected on the Ocean Drilling Program (ODP) Leg 204: Drilling Gas Hydrates On Hydrate Ridge, Cascadia Continental Margin. This report discusses the design and fabrication of the instrument, detailing novel features that help reduce the weight and increase the portability of the instrument. Sample x-ray images are included. The x-ray scanner was transferred to scientific drilling vessel, the JOIDES Resolution, by the resupply ship Mauna Loa, out of Coos Bay, Oregon on July 25. ODP technicians were trained in the instruments operation. The availability of the x-ray scanner at the drilling site allows real-time imaging of cores containing methane hydrate immediately after retrieval. Thus, imaging experiments on cores can yield information on the distribution and quantity of methane hydrates. Performing these measurements at the location of core collection eliminates the need for high pressures or low temperature core handling while the cores are stored and transported to a remote imaging laboratory.