Description
Applications
Schematic illustration of the Azimuthal Density Neutron tool (LWD-ADN).
Specifications
ODP Logging Services, Lamont-Doherty Earth Observatory, Rt. 9W, Palisades, NY 10964
Logging-While-DrillingAzimuthal Density Neutron Tool
♦ In situ estimation of bulk porosity and permeability♦ Estimation of fluid pressure♦ Lithology estimation and rock chemistry
characterization♦ Provides information regarding the spatial varation
of physical properties around the borehole
The Azimuthal Density Neutron tool (LWD-ADN) is the latest generation density/neutron LWD tool offered by Schlumberger Drilling & Measurements. Similar to its predecessor, the Compensated Density Neutron tool (CDN), it is combinable with other LWD tools. Unlike the CDN, however, the ADN can be configured to provide real-time apparent neutron porosity, formation bulk density and photoelectric factor data to characterize formation porosity and lithology while drilling. These nuclear measurements are borehole compensated for improved accuracy, standoff, and photoelectric factor measurements while drilling.
Assembly of the ADN tool aboard the JOIDES Resolution.
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* Repeatability due to counting statistics at 2 samples/ft using 3-point averaging.** Sensor specifications. Actual data resolution depends on sampling rate.
0
100
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810
125 m
790CDP
Dep
th (
mbs
f)AB
Site 808 Holes
CI
Sand Turbidites
Volcanic Ash
Mud/Mudstone
Silt Turbidites
Basalt Basement
Lithology
Log dataCore data
Gamma ray (gAPI)
Density (g/cm3)
0 40 80 1 2 3
Rec
over
yFrontal thrust
Décollement
12/2003
Summary diagram showing combined results from a variety of measure-ments. From left to right: depth-converted seismic reflection data, core recovery, lithology, log gamma ray, and core and ADN density. (Figure courtesy of the ODP Leg 196 shipboard scientific party.)