Citation:

epic.43904.d001

Name: Downhole logging of the AND-2A borehole, Victoria Land Basin, McMurdo Sound, Antarctica
Published: 2009
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Under the framework of the ANDRILL Southern McMurdo Sound (SMS) Project successful downhole experiments were conducted in the 1138.54 metre (m)-deep AND-2A borehole. Wireline logs successfully recorded were: magnetic susceptibility, spectral gamma ray, sonic velocity, borehole televiewer, neutron porosity, density, calliper, geochemistry, temperature and dipmeter. A resistivity tool and its backup both failed to operate, thus resistivity data were not collected. Due to hole conditions, logs were collected in several passes from the total depth at ~1138 metres below sea floor (mbsf) to ~230 mbsf, except for some intervals that were either inaccessible due to bridging or were shielded by the drill string. Furthermore, a Vertical Seismic Profile (VSP) was created from ~1000 mbsf up to the sea floor. The first hydraulic fracturing stress measurements in Antarctica were conducted in the interval 1000-1138 mbsf. This extensive data set will allow the SMS Science Team to reach some of the ambitious objectives of the SMS Project. Valuable contributions can be expected for the following topics: cyclicity and climate change, heat flux and fluid flow, seismic stratigraphy in the Victoria Land Basin, and structure and state of the modern crustal stress field.

Project(s):

Antarctic Geological Drilling (ANDRILL)

Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas (SPP1158)

Funding:

German Research Foundation (DFG), grant/award no. 5472008 : Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas

Coverage:

Latitude: -77.758141 * Longitude: 165.276765

Date/Time Start: 2007-10-10T12:00:00 * Date/Time End: 2007-11-30T12:00:00

Minimum DEPTH, sediment/rock: 400.425 m * Maximum DEPTH, sediment/rock: 982.825 m

Event(s):

AND-2A * Latitude: -77.758141 * Longitude: 165.276765 * Date/Time Start: 2007-10-10T12:00:00 * Date/Time End: 2007-11-30T12:00:00 * Elevation: -380.0 m * Recovery: 1138.54 m * Location: McMurdo Sound * Campaign: (Southern McMurdo Sound) * Basis: McMurdo Station * Method/Device: Drilling/drill rig (DRILL) * Comment: Coring site is located ~25 km from the United States' McMurdo Station and from New Zealand's Scott Base on a 8.5 m thick floating sea-ice platform.

Comment:

Physical parameters measured in the AND-2A borehole drilled by the ANDRILL Southern McMurdo Sound Project (SMS) from October to December 2007. The respective parameters are wet bulk density, porosity, magnetic susceptibility, spectral gamma radiation and the content of potassium, thorium and uranium. The data set covers the depth interval from 400 mbsf (meters below seafloor) to 983 mbsf.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DEPTH, sediment/rock	Depth sed	m			Geocode
2	Density, wet bulk	WBD	g/cm³	Wonik, Thomas	Analog impulse tool (D48)
3	Porosity	Poros	% vol	Wonik, Thomas	Antares digital loggin tool
4	Magnetic susceptibility, volume	kappa	10^-6 SI	Wonik, Thomas	Antares digital loggin tool
5	HNGS Standard total Gamma Ray	HSGR	gAPI	Wonik, Thomas	Antares digital loggin tool
6	Potassium	K	%	Wonik, Thomas	Antares digital loggin tool
7	Thorium	Th	mg/kg	Wonik, Thomas	Antares digital loggin tool
8	Uranium	U	mg/kg	Wonik, Thomas	Antares digital loggin tool

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

40775 data points

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