Borehole Seismic Data

 

Science operator: Texas A&M University

Hole: U1555G

Expedition: 384

Location: Central North Atlantic Ocean

Latitude: 60° 13.6849' N

Longitude: 28° 29.9997' W

Logging date: August 14-16, 2020

Sea floor depth (driller's): 1534.6 m DRF

Sea floor depth (logger's): 1532 m WRF (FMS/DSI/GPIT/HNGS Main Run)

Total penetration: 1844.1 m DRF (309.5 m DSF)

Total core recovered: 60.3 m (43 % of cored section)

SEISMIC TOOL USED: VSI (Versatile Seismic Imager)

The logging data was recorded by Schlumberger in LDF/DLIS format. All processing, including first arrival picking and stacking, was performed by Schlumberger during Expedition 384. The data was then converted into SEGY format at LDEO, using tcode developed in house. In Hole U1555G the VSI/HNGS tool string collected five good shots at two depths, 1767.1 and 1827.6 m WRF (235.1 and 295.6 m WSF). The data has been shifted to the sea floor, but it has not been depth-matched to the reference run. Only the gamma ray curves recorded with the VSI string has been depth-matched to the sea floor.

Stacks are generally calculated with at least nine good traces.

All the data in the SEGY files are sorted shot by shot (i.e. chronologically).

Additional information about the drilling and logging operations can be found in the Operations and Downhole Measurements sections of the expedition report, Proceedings of the International Ocean Discovery Program, Expedition 384.

For any question about the data or about the LogDB database, please contact LogDB support: logdb@ldeo.columbia.edu.