Underway Geophysics
Summary
This expedition had two main areas of operations. A set of international sites roughly 1600 miles west of Chile, and a group of sites within Chilean waters just off the west coast. This long transit allowed for a long continuous run on both the maggie and bathy.
Transit | Maggie | Bathy | Comments |
PA to CSP-2B (L1T) | Yes | Yes |
|
CSP-2B to CSP-7A (L2T) | No | Yes |
|
CSP-7A to CSP-1A (L3T) | No | Yes | Bad weather caused us to transit slow(~5kn) as well as overshoot site by 150 miles before we could turn around safely. |
CSP-1A to CHI-4B (L4T) | Yes | Yes | Weather caused us to take an indirect route going as far north as S42 Latitude. |
CHI-4B to ESP-1B (L5T) | No | Yes | Maggie could not be run in Chilean waters. |
Individual Measurement Systems
Navigation
WinFrog was run the entire expedition with no major issues. A few times it had to be restarted and loaded with a saved config file to clear communication issues with the bathy, maggie, or JR data server. USB to RS-232 ports had to be reset once to clear communication issues with the magnetometer.
Site Fix was used at each hole that was cored to depth with no issues collecting and displaying location data or saving site reports.
Bathymetry
Bathy 2010 was run on all transits and used to obtain a PDR before drilling on each site. It was entirely run using Zoom(Bottom) mode with the processed SEGY data recording mode selected. We tested trying to use the manual SEGY start time option in order to more consistently capture accurate SEGY data but quickly realized that this method was not feasible.
Site | Prospectus Depth(m) | PDR Water Depth | Drilled Water Depth |
CSP-2B(U1539) | 4111 | 4072 | 4071 |
CSP-7A(U1540) | 3551 | 3571 | 3580 |
CSP-1A(U1541) | 3621 | 3599 | 3604 |
CHI-4B | 1111 | 1101 | 1101 |
ESP-1B | 3900 | 3867 | 3864 |
CHI-1C | 2091 |
|
|
Magnetometer
The magnetometer was run as much as possible depending on the sea conditions and permissions allowed. No connection issues occurred with the maggie and Sealink software. During L4T the breaker tripped on the port side winch just as we began to reel it in. However once reset it was brought in with no further issue.
Documentation
- UW lab now has a second inventory sheet for all of the Swagelok parts moved back there.
- Organized the inventory sheets in UW lab so that each item has a sub-location that are labeled on the corresponding drawers.
- Updated the UW floor map and uploaded a digital copy to the confluence lab notebook.
Downhole Measurement Lab
Summary
We had planned to log each of the three Chilean sites, however due to time constraints we were forced to abandon all logging for this expedition. We conducted APTC-3 formation temperature measurements at each site except for the final Chilean site.
APTC-3 Tool
For consistency between each measurement all temperature measurements were collected using tool 1858007C.
Site/Hole | Core and corresponding measurement depth(mbsf) |
U1539A | 4H(33.1), 7H(61.6) 10H(90.1), |
U1539C | 4H(38), 13H(133), 16H(152) |
U1540A | 4H(37.5), 7H(66), 10H(93.3), 13H(131.1), 16H(150) |
U1540D | 22H(210.5)a |
U1540E | 5H(165.5), 8H(184.5) |
U1541B | 4H(45.1), 7H(64.1), 11H(102.6), 15H(138)b |
U1542A | 4H(35.6), 7H(64.4), 10H(92.6), 13H(121.1), 16H(140.8) |
U1543A | 4H(35.6), 7H(64.1), 10H(92.6), 13H(121.1), 16H(149.6), 19H(178.1), 22H(206.6) |
a. Due to a hard rock layer and high heave the tool was not able to stay in place for enough time to obtain a useful temperature curve of the formation. Cutting shoe was chipped and dinged and needed to be buffed out upon disassembly.
b. When tool was fired it hit a hard rock layer causing a large chunk of the cutting shoe to be removed. It was later identified in a section of the core using the x-ray imager. Due to the damage the shoe is no longer in use and will be sent back to shore for repair or decommissioned.
