logging-while-drilling azimuthal density neutron tool · 2002. 6. 21. · odp logging services,...

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-Drilling Azimuthal 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 Anadrill. 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. : t h g i e w l o o T ) g k 7 0 9 ( m b l 0 0 0 2 : h t g n e l l o o T ) m 2 6 . 6 ( t f 7 . 1 2 : e g n a r e r u t a r e p m e T ) C ° 0 5 1 o t ° 5 2 - ( F ° 0 0 3 o t ° 3 1 - : D O r a l l o C s e c n a r e l o t I P A . n i 5 7 . 6 : D O r e z i l i b a t S . n i 5 7 8 . 9 - 5 2 . 8 : e u q r o t y r a t o r m u m i x a M f b l - t f 0 0 0 , 6 1 ) r e z i l i b a t s h t i w , e l o h . n i - 5 . 8 ( s n o i t a c i f i c e p s t n e m e r u s a e M y c a r u c c A l a c i t s i t a t S * y t i l i b a t a e p e r r h / t f 0 0 2 t a l a c i t r e V n o i t u l o s e r . g v a , y t i s n e D m c / g 5 1 0 . 0 - / + 3 m c / g 6 0 0 . 0 - / + 3 * * . n i 6 . g v a , y t i s o r o p n o r t u e N % 5 - / + . u . p 5 . 0 - / + . u . p 5 . 1 - / + * * . n i 2 1 . g v a , F E P % 5 - / + t i n u 5 2 . 0 - / + * * . n i 2 : t i b n o t h g i e w m u m i x a M L / 0 0 0 , 0 0 0 , 4 7 = F 2 e h t s i L e r e h w ( f b l ) t e e f n i s r e z i l i b a t s n e e w t e b e c n a t s i d : ) g n i d n e b o n ( l l u p r e v o . x a M f b l 0 0 0 , 0 3 3 : e r u s s e r p g n i t a r e p o . x a M i s p 0 0 0 , 0 2 : e t a r w o l f m u m i x a M n i m / l a g 0 0 8 * 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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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.)