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Description
Applications
Schematic illustration of the AzimuthalDensity 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 varationof physical properties around the borehole
The Azimuthal Density Neutron tool (LWD-ADN) isthe latest generation density/neutron LWD tool offeredby Anadrill. Similar to its predecessor, the CompensatedDensity Neutron tool (CDN), it is combinable withother LWD tools. Unlike the CDN, however, the ADNcan be configured to provide real-time apparent neutronporosity, formation bulk density and photoelectric factordata to characterize formation porosity and lithologywhile drilling. These nuclear measurements are boreholecompensated for improved accuracy, standoff, andphotoelectric factor measurements while drilling.
Assembly of the ADN tool aboardthe 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.
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125 m
790CDP
De
pth
(m
bsf)
AB
Site 808 Holes
CI
Sand Turbidites
Volcanic Ash
Mud/Mudstone
Silt Turbidites
Basalt Basement
Lithology
Log data
Core data
Gamma ray (gAPI)
Density (g/cm3)
0 40 80 1 2 3
Recovery
Frontal thrust
Décollement
6/2002
Summary diagram showing combined results from a variety of measure-ments. From left to right: depth-converted seismic reflection data, corerecovery, lithology, log gamma ray, and core and ADN density. (Figurecourtesy of the ODP Leg 196 shipboard scientific party.)
