The National Methane Hydrates R&D Program
The DOE/JIP Gulf of Mexico Hydrate Research Cruise
During this expedition we will maintain a log of information relayed from the chief Scientist on the expedition. Whenever possible, images will be displayed along with the text.
May 1 - Day 15 - Status Report
1 May 2005 - On Location Atwater Valley Block 13 - core analyses
Location: On location Atwater Valley Block 13#2
Science Update: Unable to carry out wireline logging at AT13#2 due to inability to run logging tools out of pipe and hole collapse. The move to AT14 is delayed because of problems with seabed frame. Reports on core logging and physical properties were presented at daily science meeting. Multi-sensor core logger (MSCL) records (P-wave, gamma, magnetic susceptibility, and temperature) of AT13#2 cores were reviewed. As with X-ray, P-wave logging is also very sensitive to the transition from gas-free to gas-containing sediments. Temperature monitors mounted in core processing van provide continuous record of ambient van temperatures, as well as core temperatures during processing. Records to date indicate need for improvements in both core handling and van cooling system to properly process and conduct planned experiments on any recovered gas hydrates. Modifications to the cooling system are underway. The Fugro shipboard lab is providing measurements of geotechnical properties. Bulk density and undrained shear strength were measured on specimens from 3 to 48 mbsf at Site AT13#2. The bulk density is 1.55 g/cm3 at the seafloor, and ranges from 1.6-1.62 g/cm3 over the interval 8-32 mbsf, and then gradually increases to 1.68 g/cm3 by 48 mbsf. Miniature vane and Torvane tests document a linear increase in undrained shear strength downhole to a maximum of 32 kPa at 48 mbsf. The increase in strength is attributed to the increase in density and decrease in porosity with increasing depth.
Plans: Plans remain the same--move to AT14#2 and begin coring as soon as possible.
Planning and Data Sheet for AT14 - #2 [PDF-10KB]
Planning and Data Sheet for AT13 - #2 [PDF-10KB]
Includes Scientific objectives for these drill sites
Day 12 Photo Gallery - Photos by NETL scientist showing core retrieval and processing
Day 10 Photo Gallery - Pressurized core prior to transfer to lab and seabed frame preparation
Day 6 Photo Gallery - Working with push cores and ROV photos of sample collection at AT 14
Day 4 Photo Gallery - Remotely Operated Vehicle (ROV), Sampling, Core Handling
Day 3 Photo Gallery - Preparation for Drilling
Day 2 Photo Gallery Loading the Uncle John [PowerPoint]
The drill ship out to sea - Setting up the lab [PowerPoint]