Borehole Seismic Data

 

Science operator: Texas A&M University

Hole: U1462C

Expedition: 356

Location: Northern Carnarvon Basin (Tropical SE Indian Ocean)

Latitude: 19° 49.2764' S

Longitude: 115° 42.6186' E

Logging date: September 10-11, 2015

Sea floor depth (driller's): 98 m DRF

Sea floor depth (logger's): 97.5 m WRF (MSS/HRLA/HLDS/EDTC/HNGS uplog)

Total penetration:  1048 m DRF (950 m DSF)

Total core recovered: 398.29 m (43.4 % of cored section)

Oldest sediment recovered: Late Miocene

Lithology: Packstone.

SEISMIC TOOL USED: VSI (Versatile Seismic Imager)

The logging data was recorded by Schlumberger in LDF format. All processing, including first arrival picking and stacking, was performed by Schlumberger during Expedition 356. The data was then converted into SEGY format at USIO/LDEO, using code developed in house. Stacks are generally calculated with at least nine good traces.

In hole U1462C a total of 245 shots stacked in 27 stations generally spaced 25 m apart were recorded between 874 m WRF (776.5 m WSF) and 205 m WRF (107.5 m WSF). The seismic data were of good quality, despite the size of the hole, which locally exceeded 20 inches.

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 356.

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